CN1040912C - Electric arc and radio frequency spectrum detection - Google Patents
Electric arc and radio frequency spectrum detection Download PDFInfo
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- CN1040912C CN1040912C CN92102453A CN92102453A CN1040912C CN 1040912 C CN1040912 C CN 1040912C CN 92102453 A CN92102453 A CN 92102453A CN 92102453 A CN92102453 A CN 92102453A CN 1040912 C CN1040912 C CN 1040912C
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Abstract
The present invention relates to a method and a device for detecting different transient radio frequency broadband frequency spectra in electric arcs or radio frequency noises in circuits. For instance, external narrow-band signals of which the frequencies are within a broadband are inhibited by a filter or a balanced mixer, and the input of the mixer can be supplied by a radio frequency signal duplicator with an input end coupled to a frequency spectrum source. A duplicator connected to the input end of the mixer uses a duplicated frequency spectrum as first output, and another duplicator connected to another input end of the mixer uses another duplicated frequency spectrum as second output. The last input end of the radio frequency mixer is used for receiving the output of a broadband noise generator; for instance, a grouped-frequency wave detector of which the input end is coupled to the output of the radio frequency mixer is used for detecting the combination of large amounts of different transient radio frequencies representing the frequency spectra or the electric arcs.
Description
The present invention relates to the detection of radio spectrum and electric arc, and the system that is used as the system of this radio spectrum of response or is used to prevent damage because of electric arc.
If given electric arc or electric spark are the primary measure of radio communication, might beyond thoughtly be to continue to exist to detecting needs such as the radio spectrum of the radio frequency noise that produces by the electric arc in the circuit.But, particular importance aspect this electric fire that need cause at the accidental electric arc in power-supply system and other circuit and other are badly damaged.At this on the one hand, although fuse and circuit-breaker can prevent serious overload, they to prevent usually be lower than the accidental electric arc that fuse blown or occurred during the current level of the level of initialization circuit circuit breaker trip and electric spark the infringement that may cause generally invalid.
On the other hand, electric fault detection problem has experienced long-term practice.For example, the United States Patent (USP) 1,462 of the H.M.Stoller of promulgation on July 17 nineteen twenty-three, 053, and the United States Patent (USP) 3,308,345 of the A.R.Van Cortlandt Warrington of promulgation on March 7th, 1967 has illustrated the different purposes of the resonant circuit that is used for fault detect.The United States Patent (USP) 3,728,620 of the J.L.Heins of promulgation on April 17th, 1973 utilizes the variable frequency source that is coupled in circuit one end to constitute the resonant circuit of transmission line as indicating fault and searching.The United States Patent (USP) 3 of the C.W.Kaiser of promulgation on August 7th, 1973,751,606 and respectively at the United States Patent (USP) 3 of the J.T.Peoples of on September 9th, 1975 and on October 21st, 1980 promulgation, 904,839 and 4,229,626 disclose the loop fault detector that utilizes detuner, phase comparator and other circuit.
The United States Patent (USP) 4,006,410 of the D.R.Roberts of promulgation on February 1st, 1977 has proposed accurately not make the corona discharge position along the high fdrequency component that the circuit of system is propagated by only handling those.The United States Patent (USP) 4,609,866 of the Loftness of on September 2nd, 1986 promulgation has proposed to receive and amplification order VHF and UHF but the method that needn't carry out the frequency exchange are sought electric system and disturbed.The B.D.Russell of on August 14th, 1984 promulgation, Jr., United States Patent (USP) 4,466,071, disclose the high impedance fault pick-up unit and utilized the method for microcomputer system.The United States Patent (USP) 4,543,524 of the R.M.Bulley of promulgation on September 24th, 1986 is conceived to the spectrum analyzer field, and 4,072,899 of the United States Patent (USP)s of the R.L.Shimp of promulgation on February 7th, 1978 focus on that radio frequency leaks the pond detection range.
Although existing above-mentioned data and some good suggestions, the electric fire and other infringement that are caused by electric arc and electric spark continue to destroy power supply and other system, and buildings, forest and street that these electric equipment have been installed.
In addition, it is frustrating problem that error-prone is reported to the police always, because the conversion transient state, easily trigger false alarm in the arc detector from the width of cloth emitter-base bandgap grading of radio and television transmitter and other resource.
On the other hand, machine, circuit and equipment usually are out of order for some reason and cause infringement, can prevent this infringement if in advance abnormal arc is detected then.For example, the commutator of electro-motor usually damages when their brush is damaged, and this is because the brush clamp spring is clipped commutator.Because this wearing and tearing with serious electric arc, are carried out early detection to this electric arc and then can be reminded you to carry out the precautionary measures.Certainly, this only is that how useful reliable arc-detection be representative example.
General objects of the present invention is to overcome above-mentioned shortcoming and satisfy top the proposition or other the expression and implicit needs herein.
The improving one's methods and installing of the broader frequency spectrum that provides each the instantaneous different radio frequency that is used for detecting radio noise about purpose of the present invention.
Relevant purpose of the present invention provides improving one's methods and installing of the generation that is used for detecting circuit electric arc.
Other purpose of the present invention will become more apparent in further disclosing.
According to a kind of method that electric arc takes place that detects of the present invention, this electric arc produces the broader frequency spectrum with instantaneous each different radio frequency, and described frequency spectrum has external narrow band signal, it is characterized in that, this method contains following steps:
Produce a combination frequency signal according to described frequency spectrum, and
Detect described frequency spectrum according to described combination frequency signal, this combination frequency signal is different from described external narrow band signal.
According to a further aspect in the invention, a kind of device that detects the generation of electric arc, this electric arc produces the broader frequency spectrum with each instantaneous different radio frequency, and described frequency spectrum has external narrow band signal,
It is characterized in that it comprises: in order to produce the device of a combination frequency signal according to described frequency spectrum; And pick-up unit, be connected with described generation device, be different from the described frequency spectrum of described combination frequency input of described external narrow band signal in order to basis.
By following by example explanation in the accompanying drawing, to the detailed description of most preferred embodiment, the present invention and various purpose thereof and aspect will be easier to understand, the same numbers label is represented identical or equivalent part in the accompanying drawing, wherein:
Fig. 1 is the skeleton view according to the radio frequency of the arc characteristic of the embodiment of the invention (RF) pickup apparatus;
Fig. 2 is the circuit diagram of the pickup apparatus of Fig. 1;
Fig. 3 is the block scheme of amplifier, wave filter and mixer components according to the embodiment of the invention;
Fig. 4 is as arc-detection and the block scheme that damages receiver one detuner, sequential logic and relay/light emitting diode (LED) driver that prevent according to the embodiment of the invention; And
Fig. 5 is the block scheme that can for example be used in the alternative embodiment of the present invention in Fig. 3 device.
Accompanying drawing illustrates the method and apparatus that is used for detecting and act on each instantaneous different radio frequency broader frequency spectrum of radio noise, and the method and apparatus of the generation that is used for detecting circuit electric arc or electric spark also is shown, and all is according to the present illustrated embodiments of the present invention.
Along with further elaboration of the present disclosure, can more specifically see the external narrow band signal of these method and apparatus blanketing frequencies in the broadband, and detect the combination of each a large amount of instantaneous different radio frequency of this frequency spectrum of expression from radio noise.In order to detect the generation of electric arc, shown in the broader frequency spectrum work of each instantaneous different radio frequency of producing according to this electric arc of method and apparatus, and the broadband by each instantaneous different radio frequency of producing from this electric arc detects the combination of a large amount of instantaneous each different radio frequencies.
In this respect, contact and other imperfection of the carbon brush of the electric current in circuit and the contact wire, loose contact, interference, wearing and tearing, damage or too vibration can produce electric arc or electric spark, then produce by arc radiation also (or) radio frequency (RF) noise propagated along the conductor of this circuit according to skin effect.In fact, the RF noise that electric arc or electric spark (being designated hereinafter simply as " electric arc ") produce comprises the broader frequency spectrum of instantaneous each different radio frequency, referred to herein as " the RF characteristic " of electric arc.
Available antenna, near field capacity coupler, ferrite core RF transformer or another RF energy pickup apparatus pick up the RF feature samples of electric arc.
Be used as restriction as an example and not, Fig. 1 illustrate be used to pick up between the circuit lead 13 of carry load electric current or among interference or the ferrite core RF transformer 10 of the RF feature of other fault electric arc 12 that form or that form by the undue arcing of switch, commutator or other element.Shown transformer 10 contains by 14 and 15 ferrite blocks of forming half of unshakable in one's determination that engage along hatching line 16 and be fixed together by fastening winding 17.In fact lead 13 is as the elementary winding of transformer 10, and copper bar picks up the secondary winding of connecting line 18 as transformer 10.
Fig. 2 is the circuit diagram of pickup apparatus shown in Figure 1.Circuit board 20 shown in Figure 1 is loaded with and comprises the also wave filter 21 of feed-in pickup apparatus output terminal 24 of input and output build-out resistor 22 and 23.Subsequent filter purpose shown in wave filter 21 and the accompanying drawing is to guarantee that the difference frequency of detected expression electric arc 12 can not be by the external noise simulation with same frequency in circuit.For example, exist to be similar to industrial emission machine and other radio-frequency signal source by the frequency emissioning signal of the difference frequency of the electric circuit inspection of current description.These external signals all do not influence the work of this testing circuit.High pass or bandpass filter can be used for this occasion.As an example, can be set in the wave filter 21 and the following frequency of other wave filter filtering 20MHz that are used as identical purpose in the circuit of current description, and allow the frequency 20MHz below pass through, if the difference frequency of distinguishing at 10MHz is utilized, for example, as hereinafter more complete description.Put it briefly, it is those components of the combination of different instantaneous radio frequencies that the embodiment of the invention has been eliminated its frequency from radio noise in fact, more intactly describes as following.
As an example, the RF component of flame current is retained in the spectral range from 1MHz to 500MHz.In the embodiment shown, reduce the following RF component of 20MHz with Hi-pass filter 21.20MHz and higher arc characteristic component are coupled to the input end of amplifier, wave filter and the described mixer components of Fig. 3 by connector 24 and 25.Especially, the RF feature of filtering puts on the input connector 25 of broadband input transformer 26 (XFMR) from the connector 24 of pickup apparatus output terminal.In an embodiment of the present invention, detecting device will respond the arc noise power spectrum level of average out to-70dbm in 20MHz arrives the 200MHz scope.
The output signal of input transformer 26 puts on first gain stage 28 by another 20MHz Hi-pass filter 27, with the signal in the following frequency spectrum of further minimizing 20MHz and (or) impulsive noise.This grade 28 preferably provides the closed type amplifier of the stable wideband gain from 0.5MHz to 500MHz of 28db.This amplifier drives next 20MHz Hi-pass filter 29, and then wave filter 29 drives another 28db broad band amplifier 31.This second amplifier 31 drives 1: 1 interstage transformer 32.The secondary of this transformer operated with earth-free balanced structure, recommends to drive two 20MHz Hi-pass filters 33 and 34.The driving power impedance that enters each wave filter is subjected to the influence of the terminal impedance that relative wave filter manifests.Two input ports 35 of these wave filters 33 and 34 driven equilibrium frequency mixer 37 and 36.Put on being attenuated with the signal level in the lower area at 20MHz of the arbitrary input port of balanced mixer like this, it surpasses the attenuation outside a channel of single 20MHz Hi-pass filter.The output 38 of frequency mixer 37 puts on bandpass filter 39.
Fig. 3 is used for radio noise and its duplicated mutually mixing and detecting the difference of a large amount of different instantaneous radio frequencies or the typical method and the device of other combination from the radio noise of this mixing.Fig. 3 and equivalent electrical circuit thereof copy as two-way with radio noise, such as 32,33,35 and 34,36, and the radio noise of one of this two-way mixed with the radio noise on another road of this two-way, to produce difference or other combination of a large amount of instantaneous each different radio frequencies in arc characteristic or other radio noise.
In whole radio frequency processing system, note making component of signal and the gain validity minimum of 20MHz with lower area.When broadband noise power spectrum that will-70dbm average in the 200MHz scope at 0.5MHz add to RF input transformer 26, the signal that is added on frequency mixer 37 each input end 20MHz in the 200MHz zone for-35dbm to-40dbm.This signal level is lower than-70dbm at each input end of frequency mixer below 20MHz.Bandpass filter 39 is output as the passband that concentrates on wave filter 39-50dbm to-55dbm.Consider the incoming level that puts on balanced mixer, the conversion loss of 15db is suitable.Term " conversion " be to for example two input signals of combination with frequency inverted be with them they difference frequency or the frequency mixer of all another combination frequencies as disclosed herein in the well-known expression way of the frequency transformation that takes place.In described embodiment, the output of frequency changer or frequency mixer 37 is the results that constitute instantaneous difference frequency between any two or more subcontinuous noise spikes of the broadband RF characteristic of the electric arc that detects.
External input such as relay transition, switching noise, carbon brush for motor noise, external radio emission etc. is created in as the frequency mixer input end 35 of commonality schemata input and the narrow band signals of 36 arrival.These signals trend towards in balanced mixer 37 disappearing, perhaps, if in slightly skew then do not produce useful signal on the difference frequency level on time or the frequency.The result is that system responses is low level, the broadband input of the RF characteristic of electric arc, but does not respond the more high level of extraneous interference.This provides the stability and the fault-resistant output of requirement.
Most preferred embodiment of the present invention is that frequency mixer 38 and bandpass filter 39 are selected the instantaneous difference frequency of 10.7MHz.This is normally used IF frequency for those elements that can buy on market, and is subjected to the protection of international practice.Other shielded IF frequency also can be used for this occasion.
The 10.7MHz output of handling of bandpass filter 39 puts on integrated circuit frequency shift keying (FSK) receiver-detuner 42 shown in Figure 4 by joint 40.This signal is coupled in the FSK receiver by the center that is used for external frequency offset signal inhibition at 10.7MHz controlled " Q " tuned circuit 43.Supply with positive supply voltage by joint 140. Joint 40 and 140 all is being appointed as in two figure shown in Fig. 3 and 4 on 41 the end bracket.In fact, 41 in two figure identical end bracket, and can contain 59 the extra contacts that resets shown in Figure 4.
The output of FSK receiver-detuner 42 occurs with two kinds of forms, for being proportional to the DC of signal level, is the white noise AC component of demodulation at output terminal 45 at output terminal 44.Signal level on the output terminal 44 does not respond ringing pulse input, if outside continuous wave radio signal found it oneself enter receiver approach on output terminal 45 no AC component.This receiver 42 provides its carrier level DC output 44, and it comprises because balanced mixer 37 produces the quadrature detector 142 of the result of frequency or phase deviation in 45 generation white noise outputs.
The carrier level DC of receiver output terminal 44 adds to voltage follower 46 by dual-time constant circuit 47.The output of positive change voltage follower drives the non-inverting input of phase inverter 48 and comparer 49.The array output of follower 46 and phase inverter 48 drives dichromatic LED (LED) 51.This LED just often is green, but along with the length of arc phenomenon and (or) increase of seriousness, will be by the orange redness that changes into.This LED51 is referred to as " arc phenomenon indicator ".
Second output of follower 46 puts on the non-inverting input of comparer 49 by the dual-time constant network 52 that comprises capacitor 53.Exchange (AC) component AC coupling and be clamped on 54 from the noise after the demodulation of receiver 42 output terminals 45, be proportional to the negative sense direct current (DC) of demodulated noise amplitude to provide.Can recall in this because the quadrature detector within the integrated circuit receiver as a result 42 of frequency that balanced mixer 37 produces or phase deviation produces white noise output 45.Be proportional to the dual-time constant network 56 that the negative sense DC of demodulated noise amplitude puts on the inverting input that comprises capacitor 57 and drive comparer 49.
For triggering and pinning comparer 49, two DC inputs must be provided and pass another input DC level.Determine DC level pair capacitor 53 that is associated with each input end and 57 speed of charging and discharging thereon by two RC time constants of network 52 and 56.It is different requiring these values for various end results.For comparer 49 is triggered and when pinning, by with lead-in wire 141 ground connection of connector 41, such as with button 59, it is resetted.
In normal work period, comparer 49 is output as low.This output is coupled in the grid of field effect transistor (FET) 61.The drain electrode of this FET remains high level and is coupled in the grid of another FET62.Saturated and the relay 63 of high level, the FET62 that keeps when its grid is energized.The source electrode of FET61 and FET62 all is connected in dual-colored LED 65.This LED is the electric arc warning indicator, and is green in normal work period, when taking place then to change redness when electric arc is reported to the police into.During the electric arc alarm condition, the electric current of green half one, FET62 and relay 63 by LED65 is interrupted, and makes green half breath of LED65 go out and relay 63 interruption of power supply.Comparer 49 change states, its output uprises and makes FET61 saturated, and red half part of operation LED65.When comparer 49 resetted, such as passing through pressing button 59, circuit returned normal condition.
In both cases, by shown in circuit or the electric arc 12 that detects under other situation within the scope of the present invention or other electric arc that may cause damage can before any badly damaged appearance, stop safely.
As special advantage, illustrated embodiment makes the operator can estimate the order of severity of electric arc.Inapparent electric arc will not trigger alarm, but color change that will LED51 is orange.At alarm condition powered-down or disconnect in the system of arc circuit not, the operator can know that whether serious electric arc or not only for temporary from the color of LED51.
Another advantage of the present invention is that embodiment available standards element is realized.For example, receiver-detuner 42 can be the broadband FSK receiver of the MC13055 type IC that for example linear and interface integrated circuit catalogue (1988) 8-65 describe in the 8-70 page or leaf at MOTOROLA.In this case, output terminal 44 can be that carrier wave detects pin 13, output terminal 45 can be a data output pin 16, the order of other pin that illustrates on the later half page or leaf of 8-65 is actually and turns upside down shown in Figure 4, also can be with reference to MOTOROLA circuit catalogue 2-57 to the 2-60 page or leaf by four line lists power supplies comparer (Quad Single Supply Comparators) LM139 type, A type IC is as the example of realizing element 46,48 and 49.
Equally, can be with reference to microcircuit (Mini-Circuits) RF/IF signal Processing guide (SF-89/90), with the form of the SBL-1 type frequency mixer on the 18th page example as frequency mixer 37, with the form of the amplifier of the MAN-1 type IC on 38 and 39 pages example as element 28 and 31, with the form of the RF transformer on the 52 and 53 pages example as element 26 and 32, and the form of the Hi-pass filter of the PHP-50 type shown in going up with 61 pages is as the example of element 21,27,29,33 and 34.Bandpass filter 39 can be the bandpass filter PBP-10.7 (MHz) by same companies manufacturing and description in for example microwave and RF (July nineteen ninety).
Yet scope of the present invention is not limited to concrete device.For example, if, then can delete the one or more wave filters shown in the accompanying drawing if allow and weaken squelch or realize squelch in another way.Similarly, element 32,33 and 34 constitutes a radiofrequency signal reproducer, this reproducer has one and is coupled in the input end that the source takes place for frequency spectrum to be detected, be used to export a frequency spectrum that this reproducer duplicates 33 on first output terminal and being used to export another frequency spectrum that this reproducer duplicates 34 on second output terminal.Scope of the present invention is not limited to certainly uses these elements.
Radio-frequency (RF) mixing 37 has first rf inputs 35 that is coupled in signal replication device first output terminal, be coupled in second rf inputs 36 of signal replication device second output terminal, and be used for putting on described first and second input ends, for example can be the radio-frequency (RF) mixing output terminal 38 of radio frequency combining of the difference frequency of each different radio frequency instantaneous in noise spectrum or the arc characteristic.But the frequency changer of available another type replaces these the shown elements in the scope of the invention.As everyone knows, nonlinear element has been used to mixing or frequency transformation occasion.
Combination of frequency detecting device 42 have one be coupled in radio-frequency (RF) mixing output terminal 37 such as the input end on 43, and comprise an output terminal 44, be used for output, the different instantaneous radio frequencies of expression electric arc or other noise detect difference or other combination.
As what obviously see from the disclosure.Multiple device is disclosed for eliminating external Radio frequency interference (RFI) basically, comprise the passband that for example has more than the combination that difference frequency or other at the instantaneous radio frequency of difference detect, the Hi-pass filter 21,27 between the radio frequency reproducer input end on signal source 12 and 32 and (or) 29.Other measure that is used for eliminating basically external Radio frequency interference (RFI) comprise frequency mixer 37 or other frequency changer and (or) between radio-frequency (RF) mixing output terminal 38 and combination of frequency detecting device or the receiver-detuner input end, have at the difference frequency of each instantaneous different radio frequency or other and detected the equilibrium response and the operation of the common bandpass filter 39 in the combination.
Fig. 4 further discloses and has been connected in frequency compounding detecting device or radio-frequency transmitter-detuner 42, be used to indicate the device of the appearance of arc characteristic or other frequency spectrum.For example, except follower 46, phase inverter 48 and LED51, or as an alternative, be connected in radio-frequency transmitter-detuner 42 follower 46, comparer 49, relay 63 and (or) generation of LED65 response arc characteristic or other frequency spectrum forms alarm condition.
The frequency compounding detecting device can comprise first device 42 of first signal that is used for producing the signal level that is proportional on the mixer output 38 and be used for second device 142 that frequency or phase deviation according to radio-frequency (RF) mixing 37 produce secondary signal.This device comprise be connected in first device 42, be used to represent arc characteristic or other frequency spectrum appearance such as 46,47,48,51 the 3rd device, and be connected in first device and be connected at least one device in second and second device, the generation that is used to respond arc characteristic or other frequency spectrum forms alarm condition such as 49,52,61,62,63,65,66 the 4th device.
If signal source is the electric arc 12 that is formed with radio noise to be detected, then generator is coupled to radio noise the input end 25 of radio frequency reproducer or transformer.In principle, can be with antenna applications in this occasion.Yet in order to reduce Radio frequency interference (RFI) width of cloth photograph, ferrite core transformer 10 preferably is connected between arc circuit 13 or other signal source and radio frequency reproducer input end or the wide-band transformer input end 25.
Fig. 5 illustrates the spendable alternative that can use when not requiring optimum performance within the scope of the present invention.Do not resemble Fig. 3 and duplicate radio noise 34, Fig. 5 circuit produces the broadband noise signal that also contains different radio frequency as the above-mentioned radio noise that comprises the broader frequency spectrum of each instantaneous different radio frequency.Wideband noise generator 68 can replace the wave filter 34 in another path in two paths between above-mentioned transformer 32 and the frequency mixer 37 in this occasion.In this case, only have a path of picking up radio noise to pass through wave filter 33 to first frequency mixer input ends 35, and the second frequency mixer input end 36 provide broadband noise by generator 68 from transformer 32.Can utilize the wideband noise generator of any kind, as long as it provides above-mentioned different radio frequency, as situation with noise diode and the like.
Also shown in Figure 5 above-mentioned frequency mixer this moment will mix with broadband noise signal from generator 68 from the radio noise of transformer 32, to produce difference or other combination of a large amount of different instantaneous radio frequencies at this mixer output, to detect electric arc or other arc characteristic or other radio spectrum, as Fig. 4.In other words, except replacing Hi-pass filters and the bottom output head grounding with transformer 32 with wideband noise generator 68, this circuit can with Fig. 3 and 4 in identical, have or need not Fig. 2.
In Fig. 1, emphasized to block in the conductor 13 or the generation of the electric arc between the conductor.But the electric arc 12 shown in the symbol can be represented on for example rotary commutator, in the contactor or the excessive arcing in the other electron component in Fig. 2.In this case, Fig. 2,3,4 or 5 circuit also can be used for detecting this excessive arcing.LED51 can be used for indicating excessive arcing, and relay 63 is used in the commutator damage, and contactor burns out or electronic component turn-offs motor, contactor or other element before the damage in addition.Before recovery operation, adopt remedial measures then.
The thorough of this instructions openly will obviously provide and hint the essence of the present invention and equivalent thereof and various other improvement and the variation in the scope for those skilled in the art.
Claims (20)
1. one kind is detected the method that electric arc takes place, and this electric arc produces the broader frequency spectrum with each instantaneous different radio frequency, and described frequency spectrum has external narrow band signal, it is characterized in that, this method contains following steps:
Produce a combination frequency signal according to described frequency spectrum; And
Detect described frequency spectrum according to described combination frequency signal, this combination frequency signal is different from described external narrow band signal.
2. the method for claim 1 is characterized in that:
The step of described generation combination frequency signal comprises: with described instantaneous each different radio frequency and broadband each instantaneous different radio frequency of signal step of mixing mutually frequently, thereby be the signal that equals described combination frequency haply with described a plurality of different frequency inverted.
3. the method for claim 1 is characterized in that,
The step of described generation combination frequency signal comprises: the step that described instantaneous each different radio frequency and the reproducing signals of described instantaneous each different radio frequency are mixed mutually, thus convert described each different radio frequency to equal described combination frequency haply signal.
4. the method for claim 1 is characterized in that, the step of described generation combination frequency signal comprises step:
Described instantaneous different radio frequency is copied to two paths, and
To mix mutually with each instantaneous different radio frequency from each instantaneous different radio frequency in one of described two paths, described each instantaneous different radio frequency is converted to the signal of the described combination frequency that equals haply from another paths in described two paths.
5. the method for claim 1 is characterized in that,
The step of described generation combination frequency signal comprises: a broadband noise signal that produces radio frequency; And described each instantaneous different radio frequency mixed mutually with described broadband noise signal, thereby with described each different frequency inverted for equaling the signal of described combination frequency haply.
6. as claim 1,2,3,4 or 5 described methods is characterized in that also comprising, eliminate the component corresponding to described combination frequency from described frequency band with each instantaneous different radio frequency haply.
7. method as claimed in claim 6 is characterized in that, described combination frequency is a difference frequency.
8. method as claimed in claim 7 is characterized in that, the step of described detection frequency spectrum comprises: with the step of described combination frequency signal demodulation.
9. method as claimed in claim 8 is characterized in that also comprising: the signal that produces a signal level that is proportional to described combination frequency signal.
10. method as claimed in claim 9 is characterized in that also comprising: produce a signal that is proportional to a signal in response to the frequency that generates in the step that produces described composite signal or phase deviation.
11. a device that detects the generation of electric arc, this electric arc produces the broader frequency spectrum with each instantaneous different radio frequency, and described frequency spectrum has external narrow band signal,
It is characterized in that it comprises: in order to produce the device of a combination frequency signal according to described frequency spectrum; And pick-up unit, be connected with described generation device, be different from the described frequency spectrum of described combination frequency input of described external narrow band signal in order to basis.
12. device as claimed in claim 11 is characterized in that, described generation device comprises a frequency mixer, mixes mutually in order to each the instantaneous different radio frequency with a wide reel number, to produce a signal equaling described combination frequency haply.
13. device as claimed in claim 11, it is characterized in that, described generation device comprises a frequency mixer, in order to the reproducing signals of described instantaneous each different radio frequency with described instantaneous each different radio frequency mixed mutually, to produce a signal equaling described combination frequency haply.
14. device as claimed in claim 11, it is characterized in that, described generation device comprises a reproducer, in order to described combination frequency signal replication is become two paths, an and frequency mixer, in order to will mixing mutually, to produce a signal equaling described combination frequency haply from each instantaneous different radio frequency of described two paths.
15. device as claimed in claim 11 is characterized in that also comprising: a broadband noise signal is a generator; With a frequency mixer, have in order to import the first input end of described instantaneous each different radio frequency, one second input end is connected with described wideband noise generator; And an output terminal, in order to export a signal that equals described combination frequency haply.
16. as claim 11,12,13,14 or 15 described devices is characterized in that, also comprise a bandpass filter, its central point is located on the described combination frequency haply.
17. device as claimed in claim 16 is characterized in that, also comprises a wave filter, in order to remove the component corresponding to described combination frequency from the band of described instantaneous each different radio frequency.
18. device as claimed in claim 17 is characterized in that, also comprises a combination frequency signal detector.
19. device as claimed in claim 18 is characterized in that, described detecting device is a difference frequency detecting device.
20. device as claimed in claim 18 is characterized in that, described signal detector is a radio-frequency transmitter detuner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92102453A CN1040912C (en) | 1992-04-01 | 1992-04-01 | Electric arc and radio frequency spectrum detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92102453A CN1040912C (en) | 1992-04-01 | 1992-04-01 | Electric arc and radio frequency spectrum detection |
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| CN1077031A CN1077031A (en) | 1993-10-06 |
| CN1040912C true CN1040912C (en) | 1998-11-25 |
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| CN92102453A Expired - Lifetime CN1040912C (en) | 1992-04-01 | 1992-04-01 | Electric arc and radio frequency spectrum detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747459B2 (en) | 2000-02-05 | 2004-06-08 | Hendry Mechanical Works | Electric arc monitoring systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950476A (en) * | 2017-03-31 | 2017-07-14 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor of some face installation parallel with detected wire |
| CN114325340B (en) * | 2021-12-31 | 2024-01-19 | 南京矽典微系统有限公司 | Test system and test method of radio frequency chip |
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| US4072899A (en) * | 1976-04-26 | 1978-02-07 | Comsonics, Inc. | RF leak detector |
| US4609866A (en) * | 1984-05-07 | 1986-09-02 | Loftness Marvin O | Electrical systems interference locator |
| CN1039659A (en) * | 1988-05-16 | 1990-02-14 | 株式会社日立制作所 | Be used for the abnormality diagnostic system and method for high voltage electric power equip ment |
| CN1026438C (en) * | 1988-05-16 | 1994-11-02 | 株式会社日立制作所 | System and method for abnormality diagnosis of high-voltage power equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747459B2 (en) | 2000-02-05 | 2004-06-08 | Hendry Mechanical Works | Electric arc monitoring systems |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1077031A (en) | 1993-10-06 |
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