CN204116216U - Can to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction - Google Patents
Can to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction Download PDFInfo
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- CN204116216U CN204116216U CN201420659035.1U CN201420659035U CN204116216U CN 204116216 U CN204116216 U CN 204116216U CN 201420659035 U CN201420659035 U CN 201420659035U CN 204116216 U CN204116216 U CN 204116216U
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Abstract
To an optoacoustic spectroscopy gas-detecting device for quartz tuning-fork resonance frequency real time correction, signal in optoacoustic spectroscopy gas detection technology can be belonged to and produces and correction field.This device comprises PC, signal generator, gating switch, laser controller, laser instrument, collimating apparatus, convex lens, air chamber, quartz tuning-fork, quartz tuning-fork modular circuit, electric current turn voltage module, prime amplifier, lock-in amplifier, data collecting card.The utility model have employed harmonic detecting with the thinking of peak detection to measure the resonance frequency of quartz tuning-fork, and measurement result is used for the drive singal source frequency in real time correction photo acoustic spectrometry system.Tuning fork resonance frequency measure portion structure is simple, and method is novel, and harmonic detecting precision is high; Be easy to integrated with photo acoustic spectrometry system, fringe cost is low, easy to use and flexible, can suppress in actual applications, because tuning fork resonance frequency drifts about the impact brought in optoacoustic spectroscopy gas detect, to improve system stability.
Description
Technical field
The utility model relates to a kind of to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, can belonging to signal in optoacoustic spectroscopy gas detection technology and produce and correction field.
Background technology
At present, quartz tuning fork photoacoustic spectral technique is applied to field of gas detection as a kind of high-acruracy survey means, its system basic structure is as Fig. 4, laser controller 22 is given after wherein PC 32 control signal generator 21 produces sweep signal, in addition also produce reference signal and give lock-in amplifier 30 to carry out harmonic detecting, laser controller 22 controls with driver module as temperature, normally work is also luminous to make laser instrument 23, the light sent gets to the convex lens 25 be embedded on air chamber 26 end face after collimating apparatus 24, light beam is focused on two interdigital centres of quartz tuning-fork 27 by convex lens 25, gas effect in light and air chamber 26 produces optoacoustic effect, excite quartz tuning-fork 27, the photoacoustic signal that quartz tuning-fork 27 detects exports as an electrical current, voltage module 28 is turned through excess current, lock-in amplifier 30 is delivered to after prime amplifier 29, the second harmonic signal that lock-in amplifier 30 extracts is after data collecting card 31 gathers, send into PC 32 and carry out analysis extraction harmonic amplitude, obtain gas concentration.
In photoacoustic spectroscopy gas detecting system, quartz tuning-fork plays an important role wherein as detector, and when quartz tuning-fork and harmonic signal occur to reach signal when resonating the most by force, Detection results is best.So, the accurate measurement of quartz tuning-fork resonance frequency is a very important link.A lot of using quartz tuning-fork as the photoacoustic spectroscopy gas detecting system of detector, the resonance frequency of quartz tuning-fork is measured once just to be adopted by system, long-play, and this wherein just exists the problem of the resonance frequency drift of quartz tuning-fork own.
In the course of the work, its resonance frequency is not unalterable to quartz tuning-fork.Environment temperature, pressure and these factors of tuning fork watch surface pollution all can cause the variation of quartz tuning-fork resonance frequency, and in the middle of actual measurement, the change of resonance frequency directly affects the frequency response of quartz tuning-fork to measuring-signal, reduce the measuring precision and accuracy.Therefore, in measuring process, carry out real-time measurement and correction to the resonance frequency of quartz tuning-fork just to seem highly significant.The measuring method of quartz tuning-fork resonance frequency has a lot, and (application number is the patent of invention " measuring method and device based on the tuning-fork type quartz crystal oscillator resonance frequency of acoustically-driven " of the people such as Wu Hongpeng, Dong Lei: 201410153686.8) be exactly a kind of device measuring quartz tuning-fork resonance frequency.This device adopts sound wave to carry out frequency sweeping as signal source to quartz tuning-fork, introduce a branch of detection light simultaneously, gather the intensity of reflected light change information being fixed on a receiving plane on locus and receiving, and its intensity is converted into corresponding electric signal, demodulation is carried out to the electric signal of reflected light, obtains the natural frequency of quartz tuning-fork to be measured according to frequency response curve.This invention needs to introduce acoustic wave source, it is more difficult that the interpolation of reflected light path simultaneously makes system debug get up, last demodulation mode is for judge change in voltage amplitude, this demodulation method is unstable and easily by accuracy limitations, facing integrated cost when being used in quartz tuning fork photoacoustic spectroscopic gas detection system high, using dumb.When needing to carry out frequency measurement to the quartz tuning-fork in photoacoustic spectroscopy gas detecting system, need the switching carrying out whole system, the real-time measurement and correction that reach resonance frequency is comparatively difficult.
Along with the fast development of electronic product industry, the frequency characteristic of quartz crystal oscillator more and more comes into one's own.Now, the method and apparatus measuring quartz crystal oscillator resonance frequency is also had no lack of precedents, but be all the frequency measuring equipment of function singleness, poor performance integrated with other detection systems, compatible low, with this kind equipment to the quartz tuning-fork in photoacoustic spectroscopy gas detecting system carry out resonance frequency measure cost very high, complex structure, troublesome poeration.So, a kind of just can seeming highly significant to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction is developed.
Summary of the invention
In order to improve the stability of quartz tuning fork photoacoustic spectroscopic gas detection system, need to carry out real time correction to the resonance frequency of the detecting element quartz tuning-fork in system.The utility model provide a kind of can to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction.
Scheme of the present utility model is the thinking adopting harmonic detecting and peak detection, in the mode of electric excitation, quartz tuning-fork is encouraged by the sweep sine that signal generator generation stepping is 0.1Hz, according to measuring experience in the past, the bandwidth of quartz tuning-fork is about 4Hz, so adopt 0.1Hz to be frequency sweep stepping, while ensureing the measuring accuracy of quartz tuning-fork resonance frequency, the frequency sweep time can be shortened as much as possible again, improve the speed of response of this device; Quartz tuning-fork produces vibration after being subject to the excitation of swept-frequency signal, when the frequency of swept-frequency signal equals the resonance frequency of quartz tuning-fork, at this time quartz tuning-fork resonance is the strongest, the resistive of itself is the most weak, the signal amplitude that quartz tuning-fork modular circuit exports is the highest, and the amplitude of output signal got by lock-in amplifier lock, like this after a frequency sweep cycle, obtain one group with frequency amplitude data one to one, frequency corresponding to amplitude maximum place is the resonance frequency of quartz tuning-fork.
The technical solution of the utility model realizes in the following manner.
A kind of can to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, comprise PC, signal generator, three gating switch a, b, c, laser controller, laser instrument, collimating apparatus, convex lens, air chamber, quartz tuning-fork, quartz tuning-fork circuit, electric currents turn potential circuit, prime amplifier, lock-in amplifier, data collecting card, it is characterized in that PC is connected with three gating switches a, b, c respectively, control its strobe state, PC is connected to signal generator simultaneously; Signal generator wherein leads up to gating switch a while be connected to laser controller, is connected to quartz tuning-fork circuit again in addition by gating switch a; Another road is connected to lock-in amplifier; Laser controller is connected with laser instrument, laser instrument is connected in collimating apparatus by its tail optical fiber, before collimating apparatus is positioned at air chamber, quartz tuning-fork is positioned within air chamber, air chamber two ends are with convex lens, enter air chamber by collimating apparatus light out by the convex lens on air chamber front end face, be incident upon quartz tuning-fork two interdigital between; The pin of quartz tuning-fork, while turn potential circuit by gating switch b with electric current and be connected, is connected to quartz tuning-fork circuit by gating switch b again in addition; Electric current turns potential circuit and is connected with prime amplifier, prime amplifier is connected on lock-in amplifier by gating switch c with quartz tuning-fork circuit jointly, lock-in amplifier is connected with data collecting card, and data collecting card is connected on PC, and PC is the central control unit of whole device;
Described quartz tuning-fork circuit comprises two resistance R1, R2, quartz tuning-fork slot, resistance R1, R2 one end is connected, its other end is connected respectively on two binding posts of quartz tuning-fork slot, and the two ends of resistance R1 are as input signal port, and the two ends of resistance R2 are as output signal port;
Described electric current turns potential circuit and comprises two resistance R3, R4, chip CA3140EZ, resistance R3 one end ground connection, and the other end receives the normal phase input end of chip CA3140EZ; Resistance R4 one end is connected with the inverting input of chip CA3140EZ, and the other end is connected with the output terminal of chip CA3140EZ; The inverting input of chip CA3140EZ is connected with one end binding post of quartz tuning-fork slot, the other end binding post ground connection of quartz tuning-fork slot.
Described laser controller model is LDC501.
Described laser instrument model is DFB-1370.
Described lock-in amplifier model is Model 7230.
Described signal generator model is PC I1721.
Above-mentioned can to a working method for the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, step is as follows:
1), by labview programming control signal generator, to produce waveform be sinusoidal wave, swept frequency range to PC is the swept-frequency signal of 32760Hz ~ 32770Hz, and swept frequency range can adjust in actual application; The frequency adjustment stepping of swept-frequency signal is set to 0.1Hz, single frequency sweep time is 1s, the response time of quartz tuning-fork is between 250ms ~ 300ms, the sweep time of 1s guarantees that it can fully respond, quartz tuning-fork circuit is delivered in swept-frequency signal Zhong mono-tunnel that signal generator produces after gating switch a gating, and the reference signal that lock-in amplifier detects as first harmonic is delivered on another road;
2), be transported to the input signal source of swept-frequency signal as this circuit of quartz tuning-fork circuit, form loop with quartz tuning-fork, resistance R1, resistance R2;
3), when the frequency of swept-frequency signal is changed to 32770Hz by 32760Hz, quartz tuning-fork excites the vibrational state of generation to change by swept-frequency signal thereupon, and the resistive of quartz tuning-fork is also with frequency change;
4), when the frequency of swept-frequency signal equals the resonance frequency of quartz tuning-fork, the resistive of quartz tuning-fork is the most weak, and impedance is minimum, and the voltage signal that resistance R2 gets at two ends is larger;
5), the voltage signal at resistance R2 two ends delivers to lock-in amplifier as the output signal of quartz tuning-fork circuit by gating switch c, with original road homogenous frequency signal sent here by signal generator as a reference, the first harmonic amplitude of quartz tuning-fork circuit signal got by lock to lock-in amplifier;
6), lock-in amplifier locks the first harmonic signal got by the collected PC of data collecting card;
7), after a frequency sweep cycle, PC just can collect one group of amplitude and frequency amplitude-frequency curve data one to one, application peak detection algorithm, and frequency values corresponding to amplitude maximum place is the resonance frequency f of quartz tuning-fork;
8) after, determining quartz tuning-fork resonance frequency f, get 1/2nd f/2 of quartz tuning-fork resonance frequency f, as the frequency of sinusoidal modulation signal, it is the sinusoidal modulation signal of f/2 that PC produces frequency by labview programming control signal generator, this sinewave modulation signal sends into laser controller after superposing the 1Hz triangular voltage sweep signal produced by signal generator after gating switch a gating, and it is that the sinusoidal signal feeding lock-in amplifier of f is as pll reference signal that synchronous signal generator produces frequency;
9), laser controller controls laser instrument and sends laser, the laser sent convex lens before collimating apparatus, air chamber then project quartz tuning-fork in air chamber two interdigital between, laser and gas interact, and generation photoacoustic signal, excites quartz tuning-fork;
10), after quartz tuning-fork detects photoacoustic signal, export from pin with the form of weak current, after gating switch b gating, be input to electric current turn potential circuit;
11), because the weak current of quartz tuning-fork exports, after completing current/voltage conversion, need to deliver to prime amplifier carry out signal amplification;
12), signal delivers to lock-in amplifier after amplifying, and the sinusoidal signal that the frequency that lock-in amplifier produces with signal generator is f as a reference, is locked and got the second harmonic signal of quartz tuning-fork signal;
13), according to Harmonic Detected Theory, secondary harmonic amplitude and gas concentration are linearly relevant, just can be obtained the gas concentration to be measured in air chamber by the amplitude detecting quartz tuning-fork second harmonic;
14), second harmonic signal data deliver to PC and carry out data analysis after data collecting card collection, draw gas concentration by fitting calibrating;
15), after gas detecting system runs a period of time T, the resonance frequency f of quartz tuning-fork may drift about, at this time by switching three gating switch a, b, the gated mode of c, re-start 1) ~ 7) step, carry out the measurement of quartz tuning-fork resonance frequency, three gating switch a are switched again after determining new resonance frequency f ', b, the gated mode of c, using f '/2 as new sinusoidal modulation signal frequency, with original triangular voltage sweep Signal averaging rear drive laser instrument, f ' delivers to as new reference signal frequency the second harmonic that quartz tuning-fork got by lock-in amplifier lock simultaneously,
16), PC by the gated mode of switching gating switch a, b, c of timed interval T, just can realize detecting in real time quartz tuning-fork resonance frequency in optoacoustic spectroscopy gas detect process and correcting.
The utility model has the advantages that, quartz tuning-fork resonance frequency measure portion structure is simple, simple circuit, method is novel, adopt harmonic detecting means, precision is high, the PC comprised in device, signal generator, lock-in amplifier all can be used for optoacoustic spectroscopy gas detect with capture card simultaneously, in conjunction with three gating switches automatically controlled with an easy quartz tuning-fork circuit, software is slightly done change on original gas detect basis, just to realize the measurement of quartz tuning-fork resonance frequency, fringe cost is extremely low, measurement result is used in gas detecting system in real time and is gone, high with the integrated level of gas detecting system, integrated convenience, use flexibly, the gas detect measurement instability that quartz tuning-fork resonant frequency drifts shipper pole comes can be eliminated in actual applications.
Accompanying drawing explanation
Fig. 1 is the structural schematic block diagram of the utility model optoacoustic spectroscopy gas-detecting device.
Wherein: 1, signal generator, 2, laser controller, 3, laser instrument, 4, collimating apparatus, 5, convex lens, 6, air chamber, 7, quartz tuning-fork, 8, electric current turns potential circuit, 9, prime amplifier, 10, lock-in amplifier, 11, data collecting card, 12, PC, 13, quartz tuning-fork circuit, 14, gating switch a, 15, gating switch b, 16, gating switch c, 17, convex lens.
Fig. 2 is the quartz tuning-fork circuit diagram in Fig. 1.
Wherein: 18, resistance R1,19, resistance R2,20, quartz tuning-fork slot.
Fig. 3 is that electric current turns potential circuit schematic diagram.
Wherein: 33, resistance R3,34, resistance R4,35, chip CA3140EZ.
Fig. 4 is common photoacoustic spectroscopy gas detecting system structured flowchart in background technology.
Wherein: 22, signal generator, 23, laser controller, 24, laser instrument, 25, collimating apparatus, 26, convex lens, 27, air chamber, 28, quartz tuning-fork, 29, current/voltage modular converter, 30, prime amplifier, 31, lock-in amplifier, 32, data collecting card, 33, PC.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further, but is not limited thereto.
Embodiment:
The utility model embodiment as Figure 1-3, a kind of can to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, comprise PC 12, signal generator 1, three gating switch a, b, c, laser controller 2, laser instrument 3, collimating apparatus 4, convex lens 5, air chamber 6, quartz tuning-fork 7, quartz tuning-fork circuit 13, electric current turns potential circuit 8, prime amplifier 9, lock-in amplifier 10, data collecting card 11, it is characterized in that PC 12 respectively with three gating switch a14, b15, c16, be connected, control its strobe state, PC 12 is connected to signal generator 1 simultaneously, signal generator 1 wherein leads up to gating switch a14 while be connected to laser controller 2, is connected to quartz tuning-fork circuit 13 again in addition by gating switch a14, another road is connected to lock-in amplifier 10, laser controller 2 is connected with laser instrument 3, laser instrument 3 is connected in collimating apparatus 4 by its tail optical fiber, before collimating apparatus 4 is positioned at air chamber 6, quartz tuning-fork 7 is positioned within air chamber 6, air chamber 6 two ends are with convex lens 5 and 17, enter air chamber 6 by collimating apparatus 4 light out by the convex lens 5 on air chamber 6 front end face, be incident upon quartz tuning-fork 7 liang interdigital between, the pin of quartz tuning-fork 7, while turn potential circuit 8 by gating switch b15 with electric current and be connected, is connected to quartz tuning-fork circuit 13 by gating switch b15 again in addition, electric current turns potential circuit 8 and is connected with prime amplifier 9, prime amplifier 9 is connected on lock-in amplifier 10 by gating switch c16 with quartz tuning-fork circuit 13 jointly, lock-in amplifier 10 is connected with data collecting card 11, data collecting card 11 is connected on PC 12, and PC 12 is central control units of whole device,
Described quartz tuning-fork circuit 13 comprises two resistance R1, R2, quartz tuning-fork slot 20, resistance R1, R2 one end is connected, its other end is connected respectively on two binding posts of quartz tuning-fork slot 20, the two ends of resistance R1 are as input signal port, and the two ends of resistance R2 are as output signal port.
Described electric current turns potential circuit 8 and comprises two resistance R3, R4, chip CA3140EZ, resistance R3 one end ground connection, and the other end receives the normal phase input end of chip CA3140EZ; Resistance R4 one end is connected with the inverting input of chip CA3140EZ, and the other end is connected with the output terminal of chip CA3140EZ; The inverting input of chip CA3140EZ is connected with one end binding post of quartz tuning-fork slot 20, the other end binding post ground connection of quartz tuning-fork slot 20.
Described laser controller 2 model is LDC501.
Described laser instrument 3 model is DFB-1370.
Described lock-in amplifier 10 model is Model 7230.
Described signal generator 1 model is PC I1721.
Claims (5)
1. an energy is to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, comprise PC, signal generator, three gating switch a, b, c, laser controller, laser instrument, collimating apparatus, convex lens, air chamber, quartz tuning-fork, quartz tuning-fork circuit, electric currents turn potential circuit, prime amplifier, lock-in amplifier, data collecting card, it is characterized in that PC is connected with three gating switches a, b, c respectively, control its strobe state, PC is connected to signal generator simultaneously; Signal generator wherein leads up to gating switch a while be connected to laser controller, is connected to quartz tuning-fork circuit again in addition by gating switch a; Another road is connected to lock-in amplifier; Laser controller is connected with laser instrument, laser instrument is connected in collimating apparatus by its tail optical fiber, before collimating apparatus is positioned at air chamber, quartz tuning-fork is positioned within air chamber, air chamber two ends are with convex lens, enter air chamber by collimating apparatus light out by the convex lens on air chamber front end face, be incident upon quartz tuning-fork two interdigital between; The pin of quartz tuning-fork, while turn potential circuit by gating switch b with electric current and be connected, is connected to quartz tuning-fork circuit by gating switch b again in addition; Electric current turns potential circuit and is connected with prime amplifier, prime amplifier is connected on lock-in amplifier by gating switch c with quartz tuning-fork circuit jointly, lock-in amplifier is connected with data collecting card, and data collecting card is connected on PC, and PC is the central control unit of whole device;
Described quartz tuning-fork circuit comprises two resistance R1, R2, quartz tuning-fork slot, resistance R1, R2 one end is connected, its other end is connected respectively on two binding posts of quartz tuning-fork slot, and the two ends of resistance R1 are as input signal port, and the two ends of resistance R2 are as output signal port;
Described electric current turns potential circuit and comprises two resistance R3, R4, chip CA3140EZ, resistance R3 one end ground connection, and the other end receives the normal phase input end of chip CA3140EZ; Resistance R4 one end is connected with the inverting input of chip CA3140EZ, and the other end is connected with the output terminal of chip CA3140EZ; The inverting input of chip CA3140EZ is connected with one end binding post of quartz tuning-fork slot, the other end binding post ground connection of quartz tuning-fork slot.
2. a kind ofly to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, can it is characterized in that described laser controller model is LDC501 as claimed in claim 1.
3. a kind ofly to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, can it is characterized in that described laser instrument model is DFB-1370 as claimed in claim 1.
4. a kind ofly to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, can it is characterized in that described lock-in amplifier model is Model 7230 as claimed in claim 1.
5. a kind ofly to the optoacoustic spectroscopy gas-detecting device of quartz tuning-fork resonance frequency real time correction, can it is characterized in that described signal generator model is PC I1721 as claimed in claim 1.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104316466A (en) * | 2014-11-05 | 2015-01-28 | 山东大学 | Photoacoustic spectrometry gas detection device capable of correcting resonant frequency of quartz tuning fork in real time |
| CN104697934A (en) * | 2015-03-20 | 2015-06-10 | 山东大学 | Gas concentration measuring method of quartz tuning fork double-beam system |
| CN104849214A (en) * | 2015-04-20 | 2015-08-19 | 北京航天控制仪器研究所 | Enhanced multi-group photoacoustic spectrum gas sensing device based on quartz tuning fork |
| CN104914076A (en) * | 2015-06-01 | 2015-09-16 | 南京先进激光技术研究院 | Optoacoustic type laser breakdown detection device |
| CN106290220A (en) * | 2016-10-11 | 2017-01-04 | 河南农业大学 | Fruit maturity nondestructive detection system based on infrared photoacoustic spectra and method |
| CN111397840A (en) * | 2020-04-17 | 2020-07-10 | 朗思科技有限公司 | Indoor ventilation frequency rapid detection device based on sulfur hexafluoride tracer gas |
| CN112665703A (en) * | 2021-01-12 | 2021-04-16 | 金陵科技学院 | Quartz tuning fork frequency rapid calibration system and method applied to photoacoustic spectroscopy |
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2014
- 2014-11-05 CN CN201420659035.1U patent/CN204116216U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316466A (en) * | 2014-11-05 | 2015-01-28 | 山东大学 | Photoacoustic spectrometry gas detection device capable of correcting resonant frequency of quartz tuning fork in real time |
| CN104697934A (en) * | 2015-03-20 | 2015-06-10 | 山东大学 | Gas concentration measuring method of quartz tuning fork double-beam system |
| CN104849214A (en) * | 2015-04-20 | 2015-08-19 | 北京航天控制仪器研究所 | Enhanced multi-group photoacoustic spectrum gas sensing device based on quartz tuning fork |
| CN104914076A (en) * | 2015-06-01 | 2015-09-16 | 南京先进激光技术研究院 | Optoacoustic type laser breakdown detection device |
| CN104914076B (en) * | 2015-06-01 | 2017-10-17 | 南京先进激光技术研究院 | A kind of optoacoustic formula laser breakdown detection means |
| CN106290220A (en) * | 2016-10-11 | 2017-01-04 | 河南农业大学 | Fruit maturity nondestructive detection system based on infrared photoacoustic spectra and method |
| CN111397840A (en) * | 2020-04-17 | 2020-07-10 | 朗思科技有限公司 | Indoor ventilation frequency rapid detection device based on sulfur hexafluoride tracer gas |
| CN112665703A (en) * | 2021-01-12 | 2021-04-16 | 金陵科技学院 | Quartz tuning fork frequency rapid calibration system and method applied to photoacoustic spectroscopy |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20171105 |