CN103439018B - Temperature difference detector and to temperature, the detection method of the temperature difference - Google Patents
Temperature difference detector and to temperature, the detection method of the temperature difference Download PDFInfo
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- CN103439018B CN103439018B CN201310401493.5A CN201310401493A CN103439018B CN 103439018 B CN103439018 B CN 103439018B CN 201310401493 A CN201310401493 A CN 201310401493A CN 103439018 B CN103439018 B CN 103439018B
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Abstract
A kind of temperature difference detector and to temperature, the detection method of the temperature difference, keeps module, analog-to-digital conversion module, computing and Logic control module, human-machine interface module, communication module including detection electric bridge, signal amplification module, sampling；Described detection bridge output is connected with signal amplification module input, signal amplification module output keeps module input to be connected with sampling, sampling keeps module output, analog-to-digital conversion module, computing and Logic control module to be sequentially connected with, described computing and Logic control module are connected with human-machine interface module, communication module respectively, and computing simultaneously and Logic control module keep module to be connected with detection electric bridge, signal amplification module, sampling respectively；The big temperature difference can be simultaneously used for and small temperature difference is measured, it is possible to manually or automatically switching range；It is prone to verification；Measured point temperature can be detected simultaneously.
Description
Technical field
The present invention relates to monitoring device technical field, particularly to a kind of high-precision for wide range measure
Temperature difference detector and to temperature, the detection method of the temperature difference.
Background technology
Differential temperature survey is the deviation situation of the temperature between two different measured points of detection.Conventional differential temperature survey
Two kinds of modes of general employing, mode one is to use two independent temperature sensors to detect two measured points respectively
Temperature, calculate two temperature difference as temperature difference data；Mode two is the heat using two identical graduations
Thermocouple sensor is connected, every thermocouple sensor one temperature spot of detection, passes according to two series connection thermocouples
The potential calculation temperature difference data of sensor output.All there is the highest the asking of the differential temperature survey degree of accuracy in two kinds of metering systems
Topic, mode one is because the temperature detection degree of accuracy is relatively low, and the temperature difference the data precision after being computed is worse；Mode
Two is because the accuracy in detection of thermocouple sensor own is the highest, the poorest etc., causes the temperature difference data recorded accurate
Exactness is poor.Therefore both the above mode is preferable for the application scenario effect that the temperature difference is bigger, but less in the temperature difference
Application scenario error maybe can not measure relatively greatly.
Conventional temperature checking method has contact type measurement and non-contact measurement two ways, wherein contact
The precision measured is the highest.3 types such as thermal resistance, thermocouple, thermistor are commonly used in contact type measurement
Sensor.Wherein, thermal resistance is generally used for high accuracy, middle low-temperature measurement field, and thermocouple is generally used for height
Temperature measurement field, thermistor is generally used for the fields of measurement of low precision.The accuracy of measurement of thermal resistance is the highest,
The linearity is best.
Summary of the invention
The purpose of the present invention is exactly for solving the problems referred to above that prior art exists, it is provided that a kind of temperature difference detector；
There is differential temperature survey precision high；The big temperature difference can be simultaneously used for and small temperature difference is measured, it is possible to manually or automatically
Switching range；It is prone to verification；Measured point temperature can be detected simultaneously.
The present invention also provides for utilizing temperature difference detector to temperature, the detection method of the temperature difference.
The present invention solves the technical scheme of technical problem:
A kind of temperature difference detector, keeps module, analog-to-digital to turn including detection electric bridge, signal amplification module, sampling
Die change block, computing and Logic control module, human-machine interface module, communication module；Described detection electric bridge exports
End is connected with signal amplification module input, and signal amplification module output and sampling keep module input even
Connecing, sampling keeps module output, analog-to-digital conversion module, computing and Logic control module to be sequentially connected with, institute
State computing and Logic control module is connected with human-machine interface module, communication module respectively, computing simultaneously and logic
Control module keeps module to be connected with detection electric bridge, signal amplification module, sampling respectively.
Described computing and Logic control module are used for: a. as required control detect electric bridge, signal amplification module,
Sampling keeps the respective duty of module；B. gather the result data of analog-to-digital conversion module, and calculate two
The temperature of measured point and temperature difference data；C. control human-machine interface module display information, receive human-machine interface module
Input data or instruction, and press command request work；D. communication control module and external equipment carry out communication,
Send data, obtain instruction, and press and work by command request；
Described signal amplification module is for being amplified the output signal U of detection electric bridge；
Described sampling keeps module for signal amplification module output signal V is sampled and kept；
Described analog-to-digital conversion module includes AD conversion element and auxiliary circuit, the analog-to-digital conversion of complete pair signals.
Described detection electric bridge includes that divider resistance I, divider resistance II, mode of operation analog switch, thermal resistance sense
Device RtA, thermal resistance sensor RtB, reference resistor III；Wherein electric resistance partial pressure resistance I, divider resistance II
One end is connected with power input E respectively, and divider resistance I other end is divided by mode of operation analog switch K
It is not connected with reference resistor III, thermal resistance sensor RtA, divider resistance I, mode of operation analog switch K
And be connected with one end of output respectively, the other end of divider resistance II and thermal resistance sensor RtB one end
It is connected with the output other end respectively, reference resistor III, thermal resistance sensor RtA, thermal resistance sensor RtB
Other end ground connection, described thermal resistance sensor RtA, thermal resistance sensor RtB be connected with two measured points respectively,
And contact with measured medium, pickup measured point temperature signal.Described detection electric bridge can be according to mode of operation mould
The state intending switch K1 constitutes two kinds of detection limit electric bridges.
Described signal amplification module includes that amplifier, enlargement ratio adjust resistance, enlargement ratio selects simulation to open
Closing, wherein enlargement ratio adjustment resistance Rx one end selects analog switch to be connected with enlargement ratio, and enlargement ratio is adjusted
The whole resistance Rx other end is connected with the feedback resistance input of amplifier, enlargement ratio select analog switch another
End is connected with amplifier out.Enlargement ratio selects analog switch to be in different on off state can to change and put
Big multiplying power adjusts the resistance value of resistance Rx, adjusts the multiplication factor of amplifier.Described signal amplification module according to
Enlargement ratio selects multiplying power selected by analog switch to be amplified the output signal of detection electric bridge.
Utilize temperature difference detector to temperature, the detection method of the temperature difference, comprise the steps:
A., standard resistance box replace thermal resistance sensor RtA access respective input, and by temperature difference detector
It is arranged on range calibration state；
B. by the temperature value that human-machine interface module input is to be calibrated, and standard electric is set according to the resistance of display
Resistance case, temperature difference detector detects and records corresponding AD conversion data under different multiplying state automatically；
C. repeating b step according to temperature from 0 DEG C to operate repeatedly, each temperature value equivalence is incremented by, to 850
DEG C terminate range calibration；
D. temperature difference detector is arranged on zero point correction state, thermal resistance sensor RtA10 and thermal resistance are passed
Sensor RtB accesses respective input, and puts in mixture of ice and water by two thermal resistance sensors and keep one section
Time, temperature difference detector automatically detects and records under temperature detecting mode, under different multiplying state, corresponding 0
DEG C time AD conversion data as temperature detection zero point value, and automatically detect and record under temperature difference detection pattern, no
With under multiplying power state, corresponding AD conversion data as the temperature difference detect zero point value, and point out exit zero point correction；
E. confirming that detection process terminates and preserves all parameters by human-machine interface module 6, calibration process terminates.
Beneficial effects of the present invention:
1. the present invention can accurately measure the temperature difference of two measured points, and can detect simultaneously or calculate two tested
The temperature of point, differential temperature survey precision is high；
2. the present invention can manually or automatically arrange the range of instrument, to guarantee that instrument is operated in best effort shape
State, meets the requirement of wide-range, solves the relevant issues that prior art exists；
3. can be simultaneously used for the big temperature difference and small temperature difference is measured, it is possible to manually or automatically switching range；It is prone to
Verification；
The most easy and simple to handle, measured point temperature can be detected simultaneously.
Accompanying drawing explanation
Fig. 1 is temperature difference detector structural representation；
Wherein, 1 detection electric bridge, 2 signal amplification modules, 3 sampling holding modules, 4 analog-to-digital conversion modules,
5 computings and Logic control module, 6 human-machine interface modules, 7 communication modules, 8 divider resistances I, 9 Working moulds
Formula analog switch K1,10 thermal resistance sensor RtA, 11 thermal resistance sensor RtB, 12 reference resistor III,
13 amplifiers, 14 enlargement ratios adjustment resistance, 15 enlargement ratios selection analog switch K2,16 current-limiting resistances,
17 sampling analog switch K3,18 holding capacitors, 19 amplifiers, 20 divider resistances II.
Detailed description of the invention
In order to be more fully understood that the present invention, explain in detail embodiments of the present invention below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of temperature difference detector, mainly include detecting electric bridge 1, signal amplification module 2, adopting
Sample keeps module 3, analog-to-digital conversion module 4, computing and Logic control module 5, human-machine interface module 6, leads to
News module 7；Described detection electric bridge 1 output is connected with signal amplification module 2 input, signal amplification module
2 outputs keep module 3 input to be connected with sampling, and sampling keeps module 3 output, analog-to-digital conversion mould
Block 4, computing and Logic control module 5 are sequentially connected with, and described computing and Logic control module 5 are respectively with man-machine
Interface module 6, communication module 7 connect, computing simultaneously and Logic control module 5 respectively with detection electric bridge 1,
Signal amplification module 2, sampling keep module 3 to connect；
Described computing and Logic control module 5 are used for: a. controls to detect electric bridge 1 as required, signal amplifies
Module 2, sampling keep the respective duty of module 3；B. the result data of analog-to-digital conversion module 4 is gathered,
And calculate temperature and the temperature difference data of two measured points；C. control human-machine interface module 6 and show information, receive
The input data of human-machine interface module 6 or instruction, and press command request work；D. communication control module 7 with
External equipment carries out communication, sends data, obtains instruction, and presses and work by command request；
Described signal amplification module 2 is for being amplified the output signal U of detection electric bridge 1；
Described sampling keeps module 3 for signal amplification module 2 output signal V is sampled and kept；
Described analog-to-digital conversion module 4 includes that AD conversion element and auxiliary circuit, the analog-to-digital of complete pair signals turn
Change.
Described detection electric bridge 1 include divider resistance I 8, divider resistance II 20, mode of operation analog switch K19,
Thermal resistance sensor RtA10, thermal resistance sensor RtB11, reference resistor III 12；Wherein divider resistance I 8,
One end of divider resistance II 20 is connected with power input E respectively, and divider resistance I 8 other end passes through work
Pattern simulation switch K19 is connected with reference resistor III 12, thermal resistance sensor RtA10 respectively, divider resistance
I 8, mode of operation analog switch K19 being connected with one end of output respectively, divider resistance II 20 another
One end and thermal resistance sensor RtB11 one end are connected with the output other end respectively, reference resistor III 12,
Thermal resistance sensor RtA10, thermal resistance sensor RtB11 other end ground connection, described thermal resistance sensor
RtA10, thermal resistance sensor RtB11 are connected with two measured points respectively, and contact with measured medium, pickup
Measured point temperature signal.Can switch electric bridge is temperature detection electric bridge or temperature difference detection electric bridge.Described detection electricity
Bridge 1 can be according to state two kinds of detection limit electric bridges of composition of mode of operation analog switch K19:
If the switch Guan Bi being a. directly connected to thermal resistance sensor RtB11 in mode of operation analog switch K19,
Another switches off, and detection electric bridge is equivalent to by divider resistance I 8, thermal resistance sensor RtA10, thermal resistance
The temperature detection electric bridge that sensor RtB11 is constituted, when thermal resistance sensor RtA10 and thermal resistance sensor
When RtB11 resistance does not waits, electric bridge output U represents when the first two measured point temperature difference, for two measured points
The temperature difference；
If the switch Guan Bi being b. directly connected to participation resistance III 12 in mode of operation analog switch K19, separately
One switches off, and detection electric bridge is equivalent to by divider resistance I 8, thermal resistance sensor RtA10, reference resistor
The III 12 temperature detection electric bridges constituted, when thermal resistance sensor RtA10 and reference resistor III 12 resistance do not wait,
Electric bridge output U represents Current Temperatures change, for the temperature of detection the first measured point.
Described temperature difference detector, can detect the temperature difference of two measured points, it is also possible to detect one of them point
Temperature, and calculate the temperature of another point.
Described signal amplification module 2 includes that amplifier 13, enlargement ratio adjust resistance Rx14, enlargement ratio choosing
Selecting analog switch K215, wherein enlargement ratio adjusts resistance Rx14 one end and selects analog switch with enlargement ratio
K215 connects, and enlargement ratio adjusts the resistance Rx14 other end and is connected with the feedback resistance input of amplifier,
Enlargement ratio selects the analog switch K215 other end to be connected with amplifier out.Enlargement ratio selects simulation
Switch K215 is in different on off state can change the resistance value of enlargement ratio adjustment resistance Rx14, adjusts
The multiplication factor of whole amplifier 13.Described signal amplification module 2 is for the output signal U to detection electric bridge 1
It is amplified.
Described sampling keep module 3 include current-limiting resistance 16, sampling analog switch K317, holding capacitor 18,
Amplifier 19.Wherein, current-limiting resistance 16, sampling analog switch K317, an input of amplifier 19
Being sequentially connected with, holding capacitor 18 one end is connected with this input of amplifier 19, other end ground connection；Described
Sampling keeps module 3 for sampling amplifier output signal V and keeping, and sampling analog switch 17 closes
During conjunction, holding capacitor 18 is charged by amplifier output signal V by current-limiting resistance 16, gathers simulation
During switch 17 disconnection, stopping charging, holding capacitor 18 is in hold mode, and amplifier 19 is by capacitance voltage
Signal equivalence exports to analog-to-digital conversion module 4.
Described computing and Logic control module 5 are the critical components of temperature difference detector, mainly complete following work
Make:
The most as required control mode of operation analog switch K19, enlargement ratio select analog switch K215,
The closed and disconnected state of sampling analog switch K317；
B. gather the result data of analog-to-digital conversion module 4, and calculate temperature and the temperature difference data of two measured points；
C. control human-machine interface module 6 and show information, receive input data or the instruction of human-machine interface module 6,
And press command request work；
D. communication control module 7 and external equipment carry out communication, send data, obtain instruction, and by and press
Command request works；
Utilize temperature difference detector to temperature, the detection method of the temperature difference, comprise the steps:
A., standard resistance box replaces thermal resistance sensor RtA10 access respective input, and the temperature difference is detected
Instrument is arranged on range calibration state；
B. by the temperature value that human-machine interface module 6 input is to be calibrated, and standard is set according to the resistance of display
Resistance box, temperature difference detector detects and records corresponding AD conversion data under different multiplying state automatically；
C. repeating b step according to temperature from 0 DEG C to operate repeatedly, each temperature value equivalence is incremented by, to 850
DEG C terminate range calibration；
D. temperature difference detector is arranged on zero point correction state, thermal resistance sensor RtA10 and thermal resistance are passed
Sensor RtB11 accesses respective input, and puts in mixture of ice and water by two thermal resistance sensors and keep one
The section time, temperature difference detector automatically detects and records under temperature detecting mode, under different multiplying state, corresponding
0 DEG C time AD conversion data as temperature detection zero point value, and automatically detect and record under temperature difference detection pattern,
Under different multiplying state, corresponding AD conversion data detect zero point value as the temperature difference, and zero point correction is exited in prompting；
E. confirming that detection process terminates and preserves all parameters by human-machine interface module 6, calibration process terminates.
Described temperature difference detector working method is:
If a. mode of operation switch is set to temperature detecting mode, detection electric bridge is temperature detection electric bridge, detection
The temperature of the first measured point；
If b. mode of operation switch is set to temperature difference detection pattern, detection electric bridge is that the temperature difference detects electric bridge, detection
The temperature difference of two measured points；
C. the second measured point is calculated according to the temperature difference of the first measured point temperature and two measured points by calculating method
Temperature；
D. according to instrument temperature range and the facilities of temperature difference measuring range parameters, instrument may operate in fixed amount
Under journey and automatic range both of which.
F., under automatic range pattern, instrument determines work range according to current detection data, if current detection number
According to the certain ratio less than work range, then the range that works expands one-level, if current detection data are more than work
The certain ratio of range, then the range that works reduces one-level.
Above-mentioned calibration process can be carried out by the cycle or carry out in the case of instrument misalignment, can be as required
All calibrate or partial collimation.
Described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology
Change that the those of ordinary skill in field is made in the essential scope of the present invention, retrofit, add or replace,
Also protection scope of the present invention should be belonged to.
Although the detailed description of the invention of invention is described by the above-mentioned accompanying drawing that combines, but not protects the present invention
Protecting the restriction of scope, on the basis of technical scheme, those skilled in the art need not pay wound
The property the made various amendments that can make of work or deformation are still within protection scope of the present invention.
Claims (5)
1. a temperature difference detector, is characterized in that, keeps module, analog-to-digital conversion module, computing and Logic control module, human-machine interface module, communication module including detection electric bridge, signal amplification module, sampling；Described detection bridge output is connected with signal amplification module input, signal amplification module output keeps module input to be connected with sampling, sampling keeps module output, analog-to-digital conversion module, computing and Logic control module to be sequentially connected with, described computing and Logic control module are connected with human-machine interface module, communication module respectively, and computing simultaneously and Logic control module keep module to be connected with detection electric bridge, signal amplification module, sampling respectively；
Described signal amplification module is for being amplified the output signal U of detection electric bridge；
Described sampling keeps module for signal amplification module output signal V is sampled and kept；
Described analog-to-digital conversion module includes AD conversion element and auxiliary circuit, the analog-to-digital conversion of complete pair signals；
Described computing and Logic control module are used for: a. controls to detect electric bridge, signal amplification module, the sampling holding respective duty of module as required；B. gather the result data of analog-to-digital conversion module, and calculate temperature and the temperature difference data of two measured points；C. control human-machine interface module display information, receive input data or the instruction of human-machine interface module, and press command request work；D. communication control module and external equipment carry out communication, send data, obtain instruction, and press command request work；
Described detection electric bridge includes divider resistance I, divider resistance II, mode of operation analog switch, thermal resistance sensor RtA, thermal resistance sensor RtB, reference resistor III；Wherein divider resistance I, one end of divider resistance II is connected with power input E respectively, divider resistance I other end by mode of operation analog switch K respectively with reference resistor III, thermal resistance sensor RtA connects, divider resistance I, mode of operation analog switch K is also connected with one end of output respectively, the other end of divider resistance II, and thermal resistance sensor RtB one end is connected with the output other end respectively, reference resistor III, thermal resistance sensor RtA, thermal resistance sensor RtB other end ground connection, described thermal resistance sensor RtA, thermal resistance sensor RtB is connected with two measured points respectively, and contact with measured medium, pickup measured point temperature signal.
2. temperature difference detector as claimed in claim 1, is characterized in that, described detection electric bridge can constitute two kinds of detection electric bridges according to the state of mode of operation analog switch K1.
3. temperature difference detector as claimed in claim 1, it is characterized in that, described signal amplification module includes amplifier, enlargement ratio adjusts resistance Rx, enlargement ratio selects analog switch, wherein enlargement ratio adjustment resistance Rx one end selects analog switch to be connected with enlargement ratio, enlargement ratio adjusts the resistance Rx other end and is connected with the feedback resistance input of amplifier, enlargement ratio selects the analog switch other end to be connected with amplifier out, enlargement ratio selects analog switch to be in different on off state can change the resistance value of enlargement ratio adjustment resistance Rx, adjust the multiplication factor of amplifier.
4. temperature difference detector as claimed in claim 3, is characterized in that, described signal amplification module selects multiplying power selected by analog switch to be amplified the output signal of detection electric bridge according to enlargement ratio.
5. utilize the temperature difference detector described in claim 1 to 4 any one to temperature, the detection method of the temperature difference, it is characterized in that, comprise the steps:
A., standard resistance box replaces thermal resistance sensor RtA access respective input, and temperature difference detector is arranged on range calibration state；
B. by the temperature value that human-machine interface module input is to be calibrated, and arranging standard resistance box according to the resistance of display, temperature difference detector detects and records corresponding AD conversion data under different multiplying state automatically；
C. repeating b step according to temperature from 0 DEG C to operate repeatedly, each temperature value equivalence is incremented by, and terminates range calibration to 850 DEG C；
D. temperature difference detector is arranged on zero point correction state, thermal resistance sensor RtA and thermal resistance sensor RtB is accessed respective input, and two thermal resistance sensors are put in mixture of ice and water and keeps a period of time, temperature difference detector automatically detects and records under temperature detecting mode, under different multiplying state, corresponding 0 DEG C time AD conversion data as temperature detection zero point value, and automatically detect and record under temperature difference detection pattern, under different multiplying state, corresponding AD conversion data as the temperature difference detect zero point value, and point out exit zero point correction；
E. confirming that detection process terminates and preserves all parameters by human-machine interface module, calibration process terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310401493.5A CN103439018B (en) | 2013-09-05 | 2013-09-05 | Temperature difference detector and to temperature, the detection method of the temperature difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310401493.5A CN103439018B (en) | 2013-09-05 | 2013-09-05 | Temperature difference detector and to temperature, the detection method of the temperature difference |
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| CN103439018A CN103439018A (en) | 2013-12-11 |
| CN103439018B true CN103439018B (en) | 2016-08-17 |
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| CN201310401493.5A Expired - Fee Related CN103439018B (en) | 2013-09-05 | 2013-09-05 | Temperature difference detector and to temperature, the detection method of the temperature difference |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105320021A (en) * | 2014-07-30 | 2016-02-10 | 北京国电智深控制技术有限公司 | Analog thermal resistance output device |
| CN104484276A (en) * | 2014-12-24 | 2015-04-01 | 深圳市振邦智能科技有限公司 | Simple test method and simple test device of temperature detection program |
| WO2018190063A1 (en) * | 2017-04-13 | 2018-10-18 | 富士電機株式会社 | Temperature detection device and power conversion device provided with same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214459U (en) * | 1987-10-21 | 1988-06-22 | 河北省标准计量学校 | Thermal resistance type thermometer with precision digital display |
| CN87214933U (en) * | 1987-11-05 | 1988-12-21 | 蔡德和 | Mini test warner for heat presenation & temprature of human body |
| CN203422168U (en) * | 2013-09-05 | 2014-02-05 | 济钢集团有限公司 | Temperature difference detector |
-
2013
- 2013-09-05 CN CN201310401493.5A patent/CN103439018B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214459U (en) * | 1987-10-21 | 1988-06-22 | 河北省标准计量学校 | Thermal resistance type thermometer with precision digital display |
| CN87214933U (en) * | 1987-11-05 | 1988-12-21 | 蔡德和 | Mini test warner for heat presenation & temprature of human body |
| CN203422168U (en) * | 2013-09-05 | 2014-02-05 | 济钢集团有限公司 | Temperature difference detector |
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