CN209495963U - A kind of infrared photoacoustic spectra detection system - Google Patents
A kind of infrared photoacoustic spectra detection system Download PDFInfo
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- CN209495963U CN209495963U CN201821968684.4U CN201821968684U CN209495963U CN 209495963 U CN209495963 U CN 209495963U CN 201821968684 U CN201821968684 U CN 201821968684U CN 209495963 U CN209495963 U CN 209495963U
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 238000001834 photoacoustic spectrum Methods 0.000 title claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 9
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 17
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 3
- 235000003140 Panax quinquefolius Nutrition 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 2
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Abstract
The utility model discloses a kind of infrared photoacoustic spectra detection systems, it includes: infrared light supply for emitting infrared light；Chopper receives the infrared light of infrared light supply transmitting, and is modulated to the infrared light received, changes infrared light periodically；Optical filter wheel is connect with chopper, and optical filter wheel includes multiple optical filters, and optical filter is used to filter the infrared light of under test gas frequency；Photoacoustic cell is attached with optical filter wheel, for converting optical signals to acoustical signal；Microphone is connect with photoacoustic cell, for acoustical signal to be converted to telecommunications and is exported to lock-in amplifier；Lock-in amplifier is connect with microphone, for extracting in microphone output electric signal by the modulated frequency signal of chopper, and filters out other signals.The utility model uses wideband infrared light supply, and in conjunction with wideband infrared light supply and laser light source, respectively different advantage realizes the optimization of entire photo-acoustic detection system to different gas progress photo-acoustic detections.
Description
Technical field
The utility model relates to gas detection technology field, especially a kind of infrared photoacoustic spectra detection system.
Background technique
The gas-insulated metal-enclosed electrical equipment of SF6 (GIS) has high dielectric strength, operational safety stabilization, conducive to environment
Protection, the advantages that time between overhauls(TBO) is long, occupied area is small and maintenance workload is small, in the power system, especially in big and medium-sized cities
It is used widely in Urban Net Construction and transformation.But in terms of operating condition in recent years, GIS both domestic and external occurs in operation
Many problems, mainly failure caused by its internal inevitably defect, once failure occurs, GIS is closed due to its
Structure makes the execution of diagnosis and the service work of failure extremely difficult, and failure can constantly expand with operation, therefore meeting
Lead to immeasurable economic loss.
Existing infrared photo acoustic detection device mid-infrared light source is generally weaker, infrared detector sensitivity is lower, causes micro-
The detection for measuring gas component is extremely difficult.
Utility model content
In view of the above drawbacks of the prior art, the purpose of this utility model is just to provide a kind of infrared photoacoustic spectra detection
System, using wideband infrared light supply, in conjunction with wideband infrared light supply and laser light source respectively different advantage to different gas into
Row photo-acoustic detection realizes the optimization of entire photo-acoustic detection system, has reached good detection effect.
The purpose of this utility model is that technical solution in this way is realized, a kind of infrared photoacoustic spectra detection system,
It includes: infrared light supply, chopper, optical filter wheel, photoacoustic cell, microphone and lock-in amplifier；
The infrared light supply is for emitting infrared light；
The chopper receives the infrared light of infrared light supply transmitting, and is modulated to the infrared light received, makes infrared
Light is periodically changed；
The optical filter wheel is connect with the chopper, and the optical filter wheel includes multiple optical filters, the optical filter
For filtering the infrared light of under test gas frequency；
The photoacoustic cell is attached with the optical filter wheel, for converting optical signals to acoustical signal；
The microphone is connect with the photoacoustic cell, for acoustical signal to be converted to telecommunications and is exported to lock-in amplifier；
The lock-in amplifier is connect with the microphone, for extracting in microphone output electric signal by chopper tune
Frequency signal after system, and filter out other signals.
Further, photoacoustic cell further includes having pressure sensor and thermocouple；
The pressure sensor is connect with optical filter wheel and microphone respectively；
The thermocouple is connect with the microphone, and the thermocouple is also connect with thermocouple controller, for measuring
Temperature, and temperature signal is converted into thermo-electromotive force signal.
Further, the internal structure connection of the lock-in amplifier is as follows:
Input amplifier is exported for receiving input signal, and after signal is amplified to bandpass filter；
Further include having trigger pulse, the trigger pulse for receiving reference signal, the trigger pulse also with phase shifter
Connection；
The bandpass filter and phase shifter are connect with low-pass filter；
The low-pass filter is also attached with the output end amplifier, is exported and is believed by the output end amplifier
Number.
By adopting the above-described technical solution, the utility model has the advantage that using wideband infrared light supply, in conjunction with
Respectively different advantage carries out photo-acoustic detection to different gas for wideband infrared light supply and laser light source, realizes entire photo-acoustic detection
The optimization of system has reached good detection effect.
Other advantages, target and feature of the utility model will be explained in the following description to a certain extent
It states, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or
Person can be instructed from the practice of the utility model.
Detailed description of the invention
The Detailed description of the invention of the utility model is as follows:
Fig. 1 is the connection schematic diagram of infrared photoacoustic spectra detection system.
Fig. 2 is infrared light supply and its energy spectrogram.
Fig. 3 be temperature be 298K and pressure be 0.1MPa under SO2Infrared absorpting light spectra.
Fig. 4 be temperature be 298K and pressure be 0.1MPa under CF4Infrared absorpting light spectra.
Fig. 5 be temperature be 298K and pressure be 0.1MPa under CO2Infrared absorpting light spectra.
Fig. 6 be temperature be 298K and pressure be 0.1MPa under SF6Infrared absorpting light spectra.
Fig. 7 is SOF2Infrared absorpting light spectra.
Fig. 8 is the frequency response curve of microphone.
Fig. 9 is lock-in amplifier structure chart.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Embodiment, as shown in Figures 1 to 9；A kind of infrared photoacoustic spectra detection system, it includes: infrared light supply, copped wave
Device, optical filter wheel, photoacoustic cell, microphone and lock-in amplifier；
Infrared light supply is for emitting infrared light；Minimum gas concentration is detected using photoacoustic technique, it is desirable that uses monochromatic source
And power is sufficiently large, monochromatic source can be the narrow laser light source of very bandwidth, can also cooperate optical filter with continuous spectrum light source
Part is realized.Selecting the principle that needs follow when light source is: lambda1-wavelength must be consistent with the absorption line of tested gas, and
It is required that avoiding the overlapping region of other components absorption line.Laser light source has enough power and monochromaticjty is good, in trace gas
It is very widely used in detection, but SF6The infrared absorption line of electric discharge decomposition components is concentrated mainly on mid infrared region, commonly
Laser is difficult to meet the requirements；Middle infrared light-emitting diode (LED) light source has high-efficient, small in size, service life long and can arteries and veins
The advantages that modulated, but the optical power that LED light source generates is usually less than 2 μ W, and the photoacoustic signal of excitation also will be very faint, from
And greatly reduce detection sensitivity.So the utility model using a kind of infra red radiation light source, can obtain meeting inspection
Survey desired continuous spectrum and optical power.
SF6The gas and its absorption peak of decomposition components is substantially distributed in 2 μm~20 μm of middle infrared band at PD, thus
The utility model selects the infrared wide spectrum light source of GY-3 type, the infrared wide spectrum light source of GY-3 type and its energy spectrogram as shown in Fig. 2, it is sent out
Light spectral region is 0.6 μm~25 μm, can cover SF6The absorption peak range of decomposition components standard spectrogram.It uses special line
It is coated with the preferable film material of stability around infrared illuminants, and on its surface, not only increases the stability of system and reliable
Property, also effectively extend service life.Its key technical indexes is shown in Table 1.
Table 1GY-3 type infrared light supply major parameter
| Model | Operating voltage | Operating current | Focal length | Smooth surface temperature | Spectral region |
| GY-3 | 5V | 11A | 130mm | 1150℃ | 0.6-25μm |
Chopper receives the infrared light of infrared light supply transmitting, and is modulated to the infrared light received, make infrared light into
Row periodically variation；
The incident light of constant intensity will not inspire photoacoustic signal, it is necessary to which carrying out certain frequency to light intensity, (modulating frequency needs
Will be in audio range) modulation could generate photoacoustic signal.Intensity modulation usually has electroosmotic pulse modulation and mechanical copped wave tune
Two ways processed: electroosmotic pulse, which is modulated, relies primarily on the operating current for cut-offfing light source to realize, generally with the increase of modulating frequency
Its modulation depth strongly reduces, and modulating frequency is not high.Mechanical chopping modulation is to carry out discontinuity to light beam using mechanical chopper
On-off is realized, suitable for the modulation of different wave length light beam, and has very high modulation efficiency.
Since the exothermic material specific heat capacity of IR thermal emitter is larger, it is difficult to obtain with electroosmotic pulse intensity modulated higher
Modulating frequency, therefore the utility model is modulated infrared beam using mechanical chopping way.Mechanical chopper usually by
It is provided with chopper disk, stabilization of speed, controllable motor and the frequency control apparatus three parts composition of light hole, main performance ginseng
Number is shown in Table 2.
Table 2C-995 chopper major parameter
Optical filter wheel is connect with chopper, and optical filter wheel includes multiple optical filters, and optical filter is for filtering under test gas
The infrared light of frequency；
When detecting multicomponent gas, it is desirable that system has good selectivity.To reach this purpose, it is necessary to using certain
The incident light of wavelength excites specific tested sample, and what it is due to infra red radiation light source generation is continuous spectrum, so needing
Corresponding optical filter is selected to be divided.
Before selecting suitable optical filter, it is necessary to first determine SF6Gas and its at PD decomposition components major absorbance peak.
The SF provided according to IEC604806The standard spectrogram of decomposition components, the absorption peak of each component are substantially distributed in 2 μm~20 μm
Infrared band, it is specific as shown in table 3.
Table 3SF6And its typical absorption peak of decomposition components
Since HF is highly acid substance, is easily reacted with materials such as equipment metal, insulation and generate stable fluoride, and
SOF4Very unstable, facile hydrolysis generates SOF2, therefore both components should not all be analyzed as PD characteristic gas, this system
Mainly for relatively stable SO2、CO2、CF4、SOF2It is detected.For the infrared absorption for further studying tested component gas
Characteristic uses line-by-line integration method to calculate in the case where temperature is 0.1MPa for 298K, pressure according to HITRAN2004 infrared data library
First three component and SF6Infrared absorption spectrum it is as shown in Figures 3 to 6, due to SOF2It is non-common gas, absorption spectrum ginseng
It examines Fourier's infrared analysis and sees Fig. 7.By comparing absorption spectrum, so that it may the characteristic absorption peak of selected each component gas.
The selection principle of characteristic absorption peak: first is that avoid the absorption line overlapping region of each gas to improve Systematic selection
Property, second is that the absorption peak that select absorption intensity big is to improve system sensitivity.To select SO2For gas characteristic absorption peak,
There are two major absorbance peak, one of absorption peak (18.881 μm) and SOF for it2An absorption peak (18.868 μm) for gas is deposited
In more serious overlapping, so the utility model chooses the characteristic absorption peak that 7.352 μm are the gas, and corresponding filter is determined
Mating plate.Table 4 gives the optical filter parameter of corresponding each decomposition components.
4 optical filter parameter of table
Photoacoustic cell is attached with optical filter wheel, for converting optical signals to acoustical signal；
In photo-acoustic detection system, the performance of photoacoustic cell is to determine one of the key factor of detection sensitivity.General optoacoustic
Chamber is divided into disresonance type and resonant mode, and in the chamber by air seal, intracavitary acoustic pressure is distributed and space bit for disresonance PA cell
Set unrelated, pressure is equal everywhere for synchronization, and such PA cell needs to seal and sensitivity is lower.In resonant mode PA cell
In, when the modulating frequency of incident light is identical with the resonance frequency of PA cell, standing wave will be formed in PA cell, obtains photoacoustic signal
Enhance to resonance, cavity is without sealing, and the influence of low-frequency noise can be effectively suppressed in higher modulating frequency, and signal-to-noise ratio is more
It is good.Since resonant mode PA cell has the characteristics that make simple, practical, high sensitivity, measured in trace gas analysis and general frequency
In applying, resonant mode PA cell is mostly used.Common acoustic resonant cavity has helmholtz resonance chamber, hole type resonant cavity and one
Tie up resonant cavity.Since One-dimensional cavity has, cavity size is small, resonance frequency is high, window noise level is low and detectable flowing
The advantages that gas, therefore the utility model uses One-dimensional cavity modelling photoacoustic cell.
Microphone is connect with photoacoustic cell, microphone, that is, sonic transducer, for acquiring generated faint sound letter in photoacoustic cell
Number, and convert thereof into electric signal.In gas photo-acoustic detection, frequently with electret type or the capacitor microphony of biased electrical die mould
Device.The utility model selects MPA201 electret capacitor type microphone, as shown in figure 8, the microphone is in 20Hz-3000Hz range
Interior frequency response curve is very flat, can carry out effectively, reliably detecting to acoustical signal faint in photoacoustic cell, associated technical parameters
It is shown in Table 5.
Table 5MPA201 microphone important technological parameters
| Diameter | Sound field type | Frequency response | Sensitivity | Dynamic range | Background noise |
| 1/2` | Free field | 20Hz-20kHz | 50mV/Pa | 16-134dBA | <16dBA |
Lock-in amplifier is connect with microphone, for extracting in microphone output electric signal by the modulated frequency of chopper
Rate signal, and filter out other signals.
The feature of photoacoustic signal maximum is exactly (consistent with chopper frequencies) known to signal frequency, utilizes this feature, base
In principle of correlation analysis, generallys use lock-in amplifier and photoacoustic signal is handled.Lock-in amplifier is actually a simulation
Fourier transformer, the output of lock-in amplifier is a DC voltage, is proportional to (the ginseng of a certain specific frequency in input signal
Examine frequency) signal amplitude, and other frequency contents in input signal will not have an impact output voltage, lock-in amplifier
Basic structure it is as shown in Figure 9.
Signal path is located at before correlator, by the active filter of low-noise preamplifier, input transformer, various functions
Wave device and main amplifier composition, function are small-signal to be amplified to the level for being enough to make correlator to work, and have inhibition
With filter out part interference effect, to expand the dynamic range of lock-in amplifier；Reference channel is that lock-in amplifier is indispensable
Few component part, be typically referenced to channel output is the symmetrical square wave synchronous with measured signal, for driving the field of correlator
Effect pipe switch, reference channel are mainly made of trigger circuit, phase-shift circuit, frequency multiplier circuit and square wave driving circuit；Correlator
For realizing the correlation function operation of both reference signal and measured signal, it is necessary to have dynamic range is big, drift is small, the time is normal
The number performances such as adjustable, wide frequency range and gain stabilization, correlator are generally made by multiplier and integrator, theoretically come
It says, with the integrator of an analog multiplier and a time of integration infinity, so that it may micro- in any noise by being buried in
Testing of Feeble Signals comes out.
The utility model selects the SR830 lock-in amplifier of Stanford company production, and the key technical indexes is shown in Table 6.
Table 6SR830 the key technical indexes
| Working frequency | Sensitivity | Noise | Common-mode rejection ratio | Harmonic distortion | Phase accuracy | Time constant |
| 1mHz-102KHz | 2nv-1v | 6nv | 100dB | -80dB | 0.01o | 10μS-30S |
During gas photo-acoustic detection, influenced clearly by pressure, temperature factor.To guarantee identical experiment item
Part, while influence of the analysis pressure and temperature to photo-acoustic detection characteristic for convenience, it is necessary to the pressure in real-time monitoring photoacoustic cell
And temperature parameter.Therefore needing to install pressure sensor and thermocouple in photoacoustic cell, thermocouple use environment temperature is -20~
70 DEG C, elementary error is ± 0.2%, liquid crystal display；Pressure sensor 0~1MPa of measurement range, measurement accuracy ± 0.25%FS.
When detection, entire detection system is fixed on laboratory table, then by being mounted on the devices such as infrared light supply, chopper, photoacoustic cell
Adjustable (device or more, front and rear, left and right can the be made mobile) optical bracket of three-dimensional below part, carries out the light path part of whole device
Debugging is overlapped the longitudinal center line of these devices on the same line.
The utility model uses wideband infrared light supply, in conjunction with the respective different advantage pair of wideband infrared light supply and laser light source
Different gas carries out photo-acoustic detection, realizes the optimization of entire photo-acoustic detection system, has reached good detection effect.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System, although the utility model is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or equivalent replacement, and practical new without departing from this
Any modification of type spirit and scope or equivalent replacement, should all cover the utility model claims it
It is interior.
Claims (3)
1. a kind of infrared photoacoustic spectra detection system, which is characterized in that the system comprises have infrared light supply, chopper, optical filtering
Piece wheel, photoacoustic cell, microphone and lock-in amplifier；
The infrared light supply is for emitting infrared light；
The chopper receives the infrared light of infrared light supply transmitting, and is modulated to the infrared light received, make infrared light into
Row periodically variation；
The optical filter wheel is connect with the chopper, and the optical filter wheel includes multiple optical filters, and the optical filter is used for
Filter the infrared light of under test gas frequency；
The photoacoustic cell is attached with the optical filter wheel, for converting optical signals to acoustical signal；
The microphone is connect with the photoacoustic cell, for acoustical signal to be converted to telecommunications and is exported to lock-in amplifier；
The lock-in amplifier is connect with the microphone, for extracting in microphone output electric signal after chopper is modulated
Frequency signal, and filter out other signals.
2. infrared photoacoustic spectra detection system as described in claim 1, which is characterized in that photoacoustic cell further includes having pressure sensing
Device and thermocouple；
The pressure sensor is connect with optical filter wheel and microphone respectively；
The thermocouple is connect with the microphone, and the thermocouple is also connect with thermocouple controller, for measuring temperature,
And temperature signal is converted into thermo-electromotive force signal.
3. infrared photoacoustic spectra detection system as described in claim 1, which is characterized in that the internal junction of the lock-in amplifier
Structure connection is as follows:
Input amplifier is exported for receiving input signal, and after signal is amplified to bandpass filter；
It further include having trigger pulse, for receiving reference signal, the trigger pulse is also connect with phase shifter the trigger pulse；
The bandpass filter and phase shifter are connect with low-pass filter；
The low-pass filter is also attached with output end amplifier, passes through the output end amplifier output signal.
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| CN201821968684.4U CN209495963U (en) | 2018-11-27 | 2018-11-27 | A kind of infrared photoacoustic spectra detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269999A (en) * | 2018-11-27 | 2019-01-25 | 国网重庆市电力公司电力科学研究院 | A kind of infrared photoacoustic spectra detection system |
| CN112710628A (en) * | 2020-12-15 | 2021-04-27 | 国网电力科学研究院有限公司 | Ultra-sensitive SF (sulfur hexafluoride) based on broadband double-optical-comb spectrum6Gas decomposition component detection method |
-
2018
- 2018-11-27 CN CN201821968684.4U patent/CN209495963U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269999A (en) * | 2018-11-27 | 2019-01-25 | 国网重庆市电力公司电力科学研究院 | A kind of infrared photoacoustic spectra detection system |
| CN112710628A (en) * | 2020-12-15 | 2021-04-27 | 国网电力科学研究院有限公司 | Ultra-sensitive SF (sulfur hexafluoride) based on broadband double-optical-comb spectrum6Gas decomposition component detection method |
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