CN104390662A - Induction power utilization technology based power transmission equipment comprehensive state monitoring system - Google Patents

Abstract

The invention discloses an induction power utilization technology based power transmission equipment comprehensive state monitoring system. The induction power utilization technology based power transmission equipment comprehensive state monitoring system comprises a sensor and a source supply device; the sensor comprises an oiliness sensing unit and a gas sensor; the oiliness sensing unit comprises a quartz crystal and interdigital transducers which are arranged at an input end and an output end of the quartz crystal; the gas sensor comprises a surface acoustic wave generation device, a surface acoustic excitation device, a detection light beam transmitting device and a light beam intensity detection device. According to the induction power utilization technology based power transmission equipment comprehensive state monitoring system, a high-pressure induction power utilization device is added to the system, stable electric energy is provided for relevant equipment in the system fully through the power utilization technology, and accordingly the problem that the power supply limit problem of the power transmission equipment comprehensive state monitoring system is solved.

Description

Based on the converting equipment comprehensive state monitoring system of induction energy fetching technology

Technical field

The present invention relates to a kind of converting equipment comprehensive state monitoring system.

Background technology

For strengthening the construction of intelligent grid, ensure the safe operation of electrical network, modern power transformation status monitoring means are absolutely necessary link, both at home and abroad to exploration and the research history of existing more than 30 year of converting equipment on-line monitoring and live detection technology.Along with the acceleration of power grid construction and the propelling of market economy, it is the maximum market of global converting equipment state on_line monitoring and diagnostic device that China becomes at present, be again produce and promote the maximum country of this kind of device, and be also difficult to industrialization with external synchronous achievement leading even in some aspects and promote the use in research level.

Although on-Line Monitor Device is applied more and more in electrical network, because a lot of device is very unripe technically, its operation stability is poor, and function is also left to be desired.Practical situations shows, there is the problems such as design is unreasonable, principle is inaccurate in some early stage monitoring devices, need to consider new technology and new technology carries out Improvement and perfection, improve its stability and accuracy, guarantee the reliability in the sole mass of sensor vitals and in-site measurement, could improve the effect of on-line monitoring, and one that improves reliability very important factor is just to ensure its power supply capacity.Make a general survey of current on-Line Monitor Device power supply technique, there is larger limitation:

(1) powered battery

Originally in high voltage and strong electromagnetic environment, there is potential safety hazard in battery; Under limited battery electric quantity supply prerequisite, usually can work for a long time with guarantee system to reduce sample frequency, real-time property is poor; Periodic replacement battery brings huge maintenance cost; Device volume is comparatively large, and installation site is subject to larger restriction.

(2) solar powered

Because most transmission line of electricity is remote, be difficult to way routinely and solve power supply supply problem, thus the power supply of these equipment generally adopts solar powered.Solar powered owing to limiting by factors such as energy conversion rate, climatic environment and costs, fully cannot meet equipment to the requirement of energy supply in round-the-clock and in long-time stability, have to add accumulator with storage of electrical energy.But because the life problems (general 2 to 3 years) of accumulator itself makes the maintenance cost of equipment greatly increase, cause ultra-high-tension power transmission line being difficult to popularization and realize on line real-time monitoring function.

(3) CT responds to power taking

Induction electricity getting device volume is comparatively large, in narrow space, install difficulty; Complex installation process, the time cycle is long; The real-time change of bus current causes electric power system to occur impacting and damaging, and the electromagnetic interference (EMI) of transformer station's complexity also can directly cause circuit working abnormal simultaneously, the easy loss of temperature measuring equipment, and security, reliability are lower.

Summary of the invention

Technical matters to be solved by this invention is just to provide a kind of converting equipment comprehensive state monitoring system based on induction energy fetching technology, is powered, guarantee power supply capacity by induction energy fetching, strengthens the reliability of on-line monitoring.

For solving the problems of the technologies described above, the present invention adopts following technical scheme: based on the converting equipment comprehensive state monitoring system of induction energy fetching technology, comprise sensor and supply device, described sensor comprises oily sensing unit and gas sensor, described oily sensing unit comprises quartz crystal and is located at the interdigital transducer of quartz crystal input end and output terminal, described gas sensor comprises surface acoustic wave generating means, surface acoustic wave excitation apparatus, detecting light beam emitter and beam intensity pick-up unit, described surface acoustic wave generating means comprises metal targets and is located at the gas-selectively adsorption film on metal targets surface, described surface acoustic wave excitation apparatus is to surface acoustic wave generating means, Emission Lasers also inspires various wave mode in surface acoustic wave generating means, described detecting light beam emitter is to surface acoustic wave generating means emission detection light beam, described beam intensity pick-up unit receives the reflected light of detecting light beam and detects the intensity of detecting light beam, described supply device is made up of induction energy fetching device, rectification stable pressuring unit and accumulator, described induction energy fetching device is electric field energy energy-collecting device, the high-tension line coupling energy produced in described electric field energy energy-collecting device collection environment is also converted to electric energy, and being stored in after rectification stable pressuring unit rectifying and voltage-stabilizing in storage battery is sensor power, also comprise data processing unit and correspondence with foreign country unit, described data processing unit converts the signal of sensing unit collection to digital signal, and described correspondence with foreign country unit completes the data communication function of the inner each sensor of single device.

Preferably, described electric field energy energy-collecting device comprises plate condenser, and this plate condenser is placed in alternating electric field.

Preferably, the integrated rectifier of described rectification stable pressuring unit and a buck converter.

Preferably, described surface acoustic wave excitation apparatus comprises laser instrument, optical filter and condenser lens, the pulse of laser instrument excitation laser, and laser pulse, by after optical filter filtering, is focused lens focus on surface acoustic wave generating means.

Preferably, described detecting light beam emitter comprises semiconductor laser, and the detecting light beam that described semiconductor laser excites focuses on surface acoustic wave generating means surface by condenser lens.

Preferably, described beam intensity pick-up unit comprises photomultiplier, and the reflected light of detecting light beam is focused on by a microlens and is converted into electric signal by photomultiplier.

The present invention solves converting equipment comprehensive state monitoring system to power the problem of limitation, add high voltage induction energy fetching device in systems in which, making full use of induction energy fetching technology for the relevant device in system provides regulated power, and high voltage induction energy fetching technology is a kind of novel induction power taking technology utilizing the electromagnetic energy responded to around ultra-high-tension power transmission line to obtain electric energy.Electromagnetic energy around transmission pressure can be converted into electric energy by this technology, for installing the power supply that nigh electrical equipment provides stable, the long-term stability of energy proof load equipment is powered, the power supplier of electrical equipments such as being suitable as on-line checkingi on high voltage electricity transmission conductive wire, monitoring, patrol and examine, be antitheft.

Beneficial effect of the present invention:

(1) induction energy fetching technology is the extremely strong technology of a kind of versatility, effectively solves a power taking difficult problem for high voltage electric power equip ment charged display device, has good application and promotional value.

(2) high voltage induction energy fetching technology adopts passive working method, achieve the status monitoring mode of passive and wireless, effectively solving the Problems existing in security, reliability, stability etc. that traditional on-Line Monitor Device exists, will be the huge advance of Condition Monitoring Technology undoubtedly.

(3) induction energy fetching technical substitution is traditional sun power, accumulator, all greatly reduce the maintenance workload of system, is conducive to cost-saving.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the invention will be further described:

Fig. 1 is structure principle chart of the present invention;

Fig. 2 is the data amplification module figure of data processing unit;

Fig. 3 is accumulator cell charging and discharging module map;

Fig. 4 is the structure principle chart of gas sensor;

Fig. 5 is the gasmetry light path change of pitch angle figure of gas sensor.

Embodiment

As shown in Figure 1, based on the converting equipment comprehensive state monitoring system of induction energy fetching technology, comprise sensor, data processing unit, correspondence with foreign country unit and supply device, described sensor unit comprises several and is installed on sensor on power equipment, supply device is made up of induction energy fetching device, rectification stable pressuring unit and accumulator, wherein, induction energy fetching device is electric field energy energy-collecting device, be placed in alternating electric field with plate condenser, its two ends induce current/voltage, electric field energy is converted to electric energy, powers to load; Rectification stable pressuring unit is by an integrated low-loss rectifier and an efficient voltage reducing type converter, with the high-tension apparatus coupling energy by producing in collection environment, then this energy conversion is become the output of well-tuned, for sensor, data processing unit and correspondence with foreign country unit provide energy; Described sensor comprises oily sensing unit and gas sensor, and oily sensing unit is the sensor made based on surface acoustic wave principle, and can be used for viscosity measurement, conductivity, specific inductive capacity and dielectric loss measurement, gas sensor is applied to gasmetry.

The signal of sensor collection is converted to the digital signal that collector can directly process by data processing unit; Correspondence with foreign country unit can complete the data communication function of single device internal sensor to collector, realizes the wireless security isolation between electrical equipment online supervision device height electronegative potential.

Wherein, the core of oil sensing unit is the measuring process of the oil quality sensor based on surface acoustic wave, comprise viscosity measurement and conductivity, specific inductive capacity and dielectric loss measurement, wherein, the principle of viscosity measurement is: when quartz crystal vibrates in liquid phase, due to capillary effect, and the solution thin layer accompanying by plane of crystal is also with quartz crystal one oscillates, its result is also equivalent to the increase of strand DNA on Surface of Quartz crystal mass loading, causes the decline of sensor oscillation frequency thus.The viscosity of solution is higher, and the liquid layer with crystal oscillation is thicker, and the mass loading of equivalence is also larger.The density of solution is higher, and the quality of liquid layer is also larger.

From fluid mechanics principle analysis, the liquid layer that the quartz crystal thinking with vibration makes shearing motion is only the solution thin layer being attached to plane of crystal, because the increase of the amplitude distance of surface acoustic wave (referring to bulk acoustic wave herein) exponentially decays, the solution layer only about surface acoustic wave wavelength within (thickness is in Lm magnitude) participates in vibration.We discuss the impact of piezoelectric sensor by solution viscosity (G), density (Q) theoretically, have all drawn the conclusion that the frequency decrease value of sensor is directly proportional to (GQ).Solution viscosity and density not only have impact to the frequency of piezoelectric sensor, are also directly connected to sensor energy loss in the solution.Solution viscosity or density higher, with crystal motion solution layer thicker, energy loss is more serious.The energy loss of sensor generally uses the dynamic resistance (Rq) of quartz crystal to characterize, and we from linear relation that is theoretical and that be derived between Rq and (GQ), and prove by experiment.

Acoustic sensor there is the diverse measuring principle with traditional measurement.Usually, a kind of equipment flow measurement kinetic viscosity, another kind of survey intrinsic (friction) viscosity.And sound wave (AW) sensor measurement acoustic impedance, (ω ρ η) 1/2.ω is angular frequency, and (2 π F) ρ is density, and η is intrinsic viscosity.

Viscosity measurement is by quartz crystal wave resonator contact liq.The mobility of liquid and viscosity determine the thickness that it is coupled to sensor surface.Sensor surface with the frequency of ω=2 π F, U amplitude uniform motion.This frequency has a setting value, and its amplitude is by the power decision of the electromagnetic wave signal of sensor.

The degree of depth that shearing-type surface acoustic wave penetrates into adjacent fluid is determined by the frequency of liquid, viscosity, density.D=(2 η/ω ρ) 1/2, obtains sound wave viscosity by the power attenuation calculated from quartz resonator to liquid.The viscosity unit measured is (AV), and it is equivalent to ρ η, (g/cm3cP).Density is multiplied by dynamic dynamic viscosity.Show that the derivation formula about conductivity, specific inductive capacity and dielectric loss is as follows:

Conductivity k=1/ (Rq);

Specific inductive capacity c is the electric capacity of quartz crystal, and d is the degree of depth that shearing-type surface acoustic wave penetrates into adjacent fluid, ε ₀for vacuum dielectric coefficient, r is electrode radius;

Dielectric loss ω is angular frequency, and c is the electric capacity of quartz crystal, and R is the initial fixed resistance value of quartz crystal, the dynamic resistance that (Rq) is quartz crystal.

In the mensuration of piezoelectric sensor oscillation frequency, quartz crystal is the ingredient of oscillatory circuit, between the constrained input end that it is connected to monofier, provides the positive feedback required for vibration, and controls the oscillation frequency of oscillatory circuit.When quartz crystal single-contact solution, because solution only contacts with an exciting electrode, do not form direct solution loop, but because there is the inductive action to high-frequency electric field, the change of electrical conductivity of solution, specific inductive capacity, dielectric loss also can cause the change of sensor oscillation frequency.Because the impact of conductivity, specific inductive capacity, dielectric loss is less, and in actual measurement system, can electrical conductivity of solution be controlled, specific inductive capacity is constant, therefore touch at one side in the research of hydraulic pressure electric transducer, less to the discussion of conductivity, specific inductive capacity, dielectric loss.If immersed by piezoelectric quartz crystal in solution, just had solution loop between two exciting electrodes of plane of crystal, in this case, the oscillation frequency of piezoelectric sensor is just by the appreciable impact of electrical conductivity of solution, specific inductive capacity, dielectric loss.

Comparatively systematic research result is carried out to two-sided tactile hydraulic pressure electric transducer and has shown that the oscillation frequency of piezoelectric sensor linearly declines with the increase of electrical conductivity of solution.Compare with classical conductivity meter, piezoelectric sensor still can detect the subtle change of electrical conductivity of solution under high conductance background exists.This characteristic gives the credit to the high precision of frequency measurement on the one hand, is then because piezoelectric sensor has low temperature coefficient on the other hand.For piezoelectric sensor, solution temperature raises, and conductivity increases, and causes frequency decrease; The viscosity of solution and density then increase with temperature and decline, thus cause sensor frequency to increase.Because the effect of these two aspects offsets mutually, so piezoelectric sensor is less than classical conductivity meter method by the impact of temperature fluctuation on the response of conductivity.

So that this sensing device is applied in the oily detection field of 35KV transformer station; in concrete enforcement, it focuses on the employing of surface acoustic wave techniques; so as the quartz crystal of sensor critical piece and interdigital transducer; need to carry out strict protection; make its serviceable life identical with monitored equipment; stable status monitoring being carried out to main equipment with regard to both having ensured that on-Line Monitor Device is sustainable like this, it also avoid because on-Line Monitor Device integrity problem produces harmful effect to the operation maintenance of main equipment simultaneously.

This surface acoustic wave sensor adopts data acquisition and the transmission mode of passive and wireless, without the need to using battery, also not needing stube cable between high electronegative potential, therefore having high security, be highly suitable for working in high pressure, strong electromagnetic environment.

The employing of novel high-pressure induction power taking technology, there is the distinctive feature of getting in energy mode and design concept, there is features such as adapting to various inclement weather, round-the-clock reliable and stable power supply, long-term non-maintaining operation, thus overcome all weak points that are solar powered and traditional CT way to take power, become the excellent selection solving a built-in unit energy supply difficult problem.

In concrete enforcement, its difficult point is the control design case of the energy acquisition design of sensing device, power amplification design and accumulator cell charging and discharging; Wherein, energy acquisition due to device is by an integrated low-loss, rectifier and an efficient voltage reducing type converter, with by collecting the high-tension line coupling energy produced in environment, then this energy conversion is become the output of well-tuned, for light-emitting element assembly provides energy.This energy acquisition module for directly to voltage waveform rectification and store gathered energy and design in an external storage capacitor, consumes any too much power by an internal parallel voltage stabilizer simultaneously.The ultra low quiescent current undervoltage lockout pattern possessing wide retarding window enables electric charge accumulate on a storage capacitor, till buck converter can send the electric charge that a part stores to output expeditiously.When non-loaded dormant state, adjustable output voltage, charges simultaneously continuously to memory capacitance.

For power amplification design, power amplifier is an important part in data processing unit.Due to less at coupling energy, directly power supply can not be provided.After low-power level signal being carried out modulate, processing, due to impedance operator, if directly link coupled circuit, will be too little because of signal, be attenuated soon.For this reason, prior art must be utilized small-signal to be carried out power amplification makes whole communication process carry out smoothly.According to actual conditions, the technology of power amplifier mainly realizes following aspect function: have enough large output power, normal transmission during guarantee signal transmits in coupled system and circuit; Require rated load impedance and the coupled circuit impedance matching of power amplifier; Because load variations is larger, require that power amplifier has strong carrying load ability; Require power amplifier working stability, dependable performance; According to the feature of typical OTL circuit, build experimental circuit as shown in the figure.In this circuit, front end is voltage amplifier, and OTL circuit is by front end input signal, and rear end is output signal.

Charge and discharge control is designed, along with the development of power electronic devices, high-power switch device as the technology of insulated gate bipolar transistor IGBT and manufacturing process increasingly mature, the application of having succeeded in transducer, Active Power Filter-APF, rectifier, inverter, Dynamic Voltage Regulator etc.In the present embodiment, adopt the circuit be made up of IGBT to produce high-power sinusoidal signal, this signal is after step-up transformer boosting and high-pressure series resonant circuit are amplified, and electric pressure can reach high pressure, UHV (ultra-high voltage), extra-high voltage rank.Establish the mathematical model of frequency modulation type resonance extra-high voltage experiment power supply, and propose the method for voltage-regulation self-adjusting Bi Li – integral control method and the phase-locked automatic frequency adjustment of a kind of new PI on this basis, thus realize pressure regulation and the frequency modulation of whole sensing device, the control method that we carry is conducive to eliminating the steady-state error of sensing device and improving the dynamic property of sensing device, be easy to Project Realization, wherein, frequency control is primarily of the uncontrollable rectification circuit of three-phase, H-bridge inverter circuit, output filter, series resonant circuit forms.

As shown in Figure 4 and Figure 5, surface acoustic wave generating means 1, surface acoustic wave excitation apparatus 2, detecting light beam emitter 3 and beam intensity pick-up unit 4 is specifically comprised.Wherein, surface acoustic wave generating means 1 comprises metal targets and is located at the gas-selectively adsorption film 11 on metal targets surface, described surface acoustic wave excitation apparatus 2 is to surface acoustic wave generating means Emission Lasers and inspire various wave mode in surface acoustic wave generating means, described surface acoustic wave excitation apparatus 2 comprises laser instrument 21, beam splitter 22 and cylindrical lens 23, the pulse of laser instrument excitation laser, laser pulse by after beam splitter by cylindrical lens focus on surface acoustic wave generating means.Described detecting light beam emitter 3 comprises semiconductor laser 31, and the detecting light beam that described semiconductor laser excites focuses on surface acoustic wave generating means surface by condenser lens 32.Described beam intensity pick-up unit 4 comprises photomultiplier 41, the reflected light of detecting light beam is focused on by a microlens 44 and is converted into electric signal by photomultiplier 41, optical filter 43 and optical fiber collimator 42 is provided with between microlens 44 and photomultiplier 41, after microlens 44 focuses on, mating plate and optical fiber collimator 42 enter photomultiplier 41 to the reflected light of detecting light beam after filtration again, photomultiplier 41 connects oscillograph 45, is shown by oscillograph 45 pairs of testing results.

Adopt the metal surface that laser is being covered with adsorbability film to excite surface acoustic wave, at film place, excited surface acoustic wave is detected by the reflected light beams deflecting method of single-core fiber coupling, and then accurately detect the concentration of gas.The advantage of this gas sensor is to adopt optical means to detect by the sound pulse of laser excitation, not only noncontact, and provides a kind of new approach for gas-monitoring.

In this SAW gas sensor, utilizing the deflection of single-core fiber detecting light beam to reflect outside surface acoustic wave information, crucial part is to have covered the very thin gas-selectively adsorption film of one deck in the centre position of target, and this film only has suction-operated to the gas of required sensitivity.The reliability that this SAW gas sensor exports depends on the stability of sensitive membrane to a great extent.

Absorption sensitive membrane has reversibility and high stability, and reversibility refers to sensitive membrane to the existing suction-operated of gas, has desorption again, and when gas concentration to be measured raises, the gas flow that film absorbs increases thereupon; When concentration reduces, film also should be able to desorb gas to be measured.Adsorption process and desorption process are strictly reciprocal.This is also the prerequisite of this gas sensor normal reliable work.Its sensitive mechanism is different with the kind difference of air-sensitive film, and when film is with isotropy insulating material, it changes the change of overlayer density into the suction-operated of gas, so the mass loading effect on SAW travel path makes SAW velocity of wave change.Thus causing the change at material surface inclination angle, surface angle changes, and luminous flux also can produce corresponding change, thus obtains new ac signal, and by detecting the size that can obtain surface angle and change, and then quantitative test detects the concentration of detected gas.

Its Cleaning Principle applied is:

When laser pulse is propagated at target material surface, small surface deformation can be produced, approximate think light beam generation mirror-reflection.If the pitch angle of surface deformation is θ, so, the angle of beam reflection hour offset original route is 2 θ accordingly, and the distance that folded light beam forms facula deviation after microlens focuses on can be expressed as:

δ＝2f ₂·θ

The radius of the focal beam spot of detecting light beam is:

R＝f ₂(r ₁/f ₁)

In formula, r1 is the radius detecting light beam; F1, f2 are the focal length (rl=2mm, f1=40mm, f2=4mm) of lens Ll (condenser lens 32), L2 (microlens 44) respectively; The radius of optical fiber is r (5 μm), and has R>>r.

The light distribution of exploring laser light light beam is:

$I=I_0\exp (-\frac{{\mathrm{\ξ}}^2+{\mathrm{\η}}^2}{A^2})$

A is constant.The luminous flux of coupling fiber is:

$\mathrm{\Φ}=I_0{\∫}_{a-r}^{a+r}{\∫}_{-\sqrt{r^2-{(\mathrm{\ξ}-a)}^2}}^{\sqrt{r^2-{(\mathrm{\ξ}-a)}^2}}\exp (-\frac{{\mathrm{\ξ}}^2+{\mathrm{\η}}^2}{A^2})\mathrm{d\ηd\ξ}$

In formula, a is the distance of center to fiber optic hub of focal beam spot.Equation can be reduced to:

$\mathrm{\Φ}=\frac{0.833{\mathrm{\Φ}}_0(a+2\mathrm{\θ}{f}_2)}{A}$

By the measurement to light flux variations, determine pitch angle easily.And the change of luminous flux is converted into ac signal: in formula, η is transforming factor (unit v/w).

Gas absorption film causes change of pitch angle.Then surface angle becomes:

θ′＝θ-△θ

Inclination angle changes, and luminous flux also can produce corresponding change, thus obtains new ac signal and be:

$U=\mathrm{\η}\·\mathrm{\Δ}{\mathrm{\φ}}^{\′}=\mathrm{\η}\·\frac{1.666{\mathrm{\Φ}}_0{\mathrm{\θ}}^{\′}{f}_2}{A}$

Then can be obtained by detection:

$\mathrm{\ΔU}=U-U^{\′}=\frac{1.666{\mathrm{\Φ}}_0\mathrm{\Δ\θ}{f}_2}{A}$

Thus can reflect the size of △ θ, and then quantitative test detects the concentration of detected gas.

To detect responsive S02 gas comparatively common in industrial circle, due to this sensor application is the sensing principle that gas adsorbability film detects tested gas.Laser is being covered with the derby surface excitation SAW of selective gas adsorption film, and the latter propagates along derby surface.After adsorbability film and tested gas react, the intensity of surface acoustic wave is changed; Then PMT (photomultiplier) is utilized, the reflected light beams deflecting method be coupled by single-core fiber detects the detecting light beam sent by semiconductor laser, the change of the light intensity detected reflects the concentration of detected gas, thus realizes the measurement of concetration of tested gas.

In actual use, derby can select aluminium, and this is a kind of isotropic metal material, and paired pulses laser easily absorbs, and optoacoustic conversion efficiency is higher, employs polishing aluminium as target, adopts polyaniline (PAn) film (responsive SO ₂gas) as adsorption film, as SO in test environment ₂when gas concentration raises, the gas flow that PAn film absorbs also increases thereupon, thus inclination angle is diminished, and output AC voltage amplitude reduces; As SO in test environment ₂when gas concentration reduces, the gas flow that film absorbs also reduces thereupon, and inclination angle increases, and output AC voltage amplitude increases.

In actual applications, a line source can be focused into by lens pillar, what excited is R wave, R wave is a kind of common Interfacial elasticity ripple, it is the polarized wave propagated along semiinfinite elastic medium Free Surface, it produces on the surface of solid and propagates surfacewise, and its amplitude is decayed rapidly from case depth, and R wave is having comparative advantage perpendicular to the propagation of line source direction.

For responsive SO in scheme ₂the gas absorption film that gas carries out detecting is polyaniline air-sensitive film.This film eigenstate, doping polyaniline powder is taken by air-sensitive film area respectively, be dissolved in N-dimethylformamide solvent, after ball milling, make it fully dissolve, disperse, then solution is carefully spun on aluminium block surface, the air-sensitive film formed after solvent volatilization.

R wave is excited by Nd:YAG laser instrument, wavelength 1.06 μm, pulsewidth 30ns, the energy of monopulse can reach 70mJ, laser pulse, by after optical filter filtering, is focused on target, when target is subject to the effect of pulse laser by a condenser lens (focal length 40mm), due to thermoelastic and melt the multiple effects such as erosion, various wave mode can be inspired in the material.Detecting light beam in this programme is sent by semiconductor laser (wavelength is 0.651 μm, and power is 5mW), receives laser reflection light realize by photomultiplier (PMT).Detecting light beam focuses on target material surface by condenser lens, reflected light is focused on by a microlens again, the light exported from optical fiber is converted into electric signal by photomultiplier, signal is after amplification filtering, sampled by A/D and be stored into processor by serial ports and process, realize the functions such as external sensing, display.

This gas sensor is in conjunction with the adsorbability film of traditional SAW gas sensor and the principle of gas effect and laser ultrasonic detection technology, laser ultrasonic detection technology is with its noncontact and be applicable to the remarkable advantages such as motion detection, a kind of important technology in field of non destructive testing and means are become, the metal surface that laser is being covered with adsorbability film is adopted to excite surface acoustic wave, at film place, excited surface acoustic wave is detected by the reflected light beams deflecting method of single-core fiber coupling, and then accurately detect the concentration of gas.The advantage of this gas sensor is to adopt optical means to detect by the sound pulse of laser excitation, not only noncontact, and provides a kind of new approach for gas-monitoring.

Claims (6)

1. based on the converting equipment comprehensive state monitoring system of induction energy fetching technology, it is characterized in that: comprise sensor and supply device, described sensor comprises oily sensing unit and gas sensor, described oily sensing unit comprises quartz crystal and is located at the interdigital transducer of quartz crystal input end and output terminal, described gas sensor comprises surface acoustic wave generating means, surface acoustic wave excitation apparatus, detecting light beam emitter and beam intensity pick-up unit, described surface acoustic wave generating means comprises metal targets and is located at the gas-selectively adsorption film on metal targets surface, described surface acoustic wave excitation apparatus is to surface acoustic wave generating means, Emission Lasers also inspires various wave mode in surface acoustic wave generating means, described detecting light beam emitter is to surface acoustic wave generating means emission detection light beam, described beam intensity pick-up unit receives the reflected light of detecting light beam and detects the intensity of detecting light beam, described supply device is made up of induction energy fetching device, rectification stable pressuring unit and accumulator, described induction energy fetching device is electric field energy energy-collecting device, the high-tension line coupling energy produced in described electric field energy energy-collecting device collection environment is also converted to electric energy, and being stored in after rectification stable pressuring unit rectifying and voltage-stabilizing in storage battery is sensor power, also comprise data processing unit and correspondence with foreign country unit, described data processing unit converts the signal of sensing unit collection to digital signal, and described correspondence with foreign country unit completes the data communication function of the inner each sensor of single device.

2. the converting equipment comprehensive state monitoring system based on induction energy fetching technology according to claim 1, is characterized in that: described electric field energy energy-collecting device comprises plate condenser, and this plate condenser is placed in alternating electric field.

3. the converting equipment comprehensive state monitoring system based on induction energy fetching technology according to claim 1, is characterized in that: the integrated rectifier of described rectification stable pressuring unit and a buck converter.

4. the converting equipment comprehensive state monitoring system based on induction energy fetching technology according to claim 1, it is characterized in that: described surface acoustic wave excitation apparatus comprises laser instrument, optical filter and condenser lens, the pulse of laser instrument excitation laser, laser pulse, by after optical filter filtering, is focused lens focus on surface acoustic wave generating means.

5. the converting equipment comprehensive state monitoring system based on induction energy fetching technology according to claim 1, it is characterized in that: described detecting light beam emitter comprises semiconductor laser, the detecting light beam that described semiconductor laser excites focuses on surface acoustic wave generating means surface by condenser lens.

6. the converting equipment comprehensive state monitoring system based on induction energy fetching technology according to claim 1, it is characterized in that: described beam intensity pick-up unit comprises photomultiplier, the reflected light of detecting light beam is focused on by a microlens and is converted into electric signal by photomultiplier.