CN203519490U - Gas spectrum absorption-type sensing device - Google Patents
Gas spectrum absorption-type sensing device Download PDFInfo
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- CN203519490U CN203519490U CN201320650520.8U CN201320650520U CN203519490U CN 203519490 U CN203519490 U CN 203519490U CN 201320650520 U CN201320650520 U CN 201320650520U CN 203519490 U CN203519490 U CN 203519490U
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- sensing device
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- absorption
- collimation lens
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
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Abstract
The utility model relates to a gas spectrum absorption-type sensing device. The as spectrum absorption-type sensing device is characterized in that the gas spectrum absorption-type sensing device comprises a shell, a DFB (distributed feed back) laser, a collimating lens, a reflector group, a detector, a lock-phase amplifier, a laser drive, a temperature control unit, a microprocessor and a liquid crystal display unit, wherein the collimating lens and the reflector group are fixed on the shell; the bottom of the shell remains an air hole, a gap is arranged between the collimating lens and the reflector group, and gaps are arranged among reflectors. The gas spectrum absorption-type sensing device provided by the utility model has the advantages that the volume is small, the sensitivity is high, and the structure is simple.
Description
Technical field
The utility model relates to a kind of gaseous spectrum absorption-type sensing device, refers more particularly to take narrow linewidth spectral absorption and detect the sensing device of gas concentration as core technology.
Background technology
In field of industrial production, in real time, exactly to inflammable, explosive, poisonous, harmful gas carry out monitoring and prediction and automatically control become one of the industry letters such as current coal, oil, chemical industry, electric power major issue to be solved.In ecologic environment field, the mankind are more and more higher to the consciousness of ecological environmental protection and purification equally, an urgent demand monitoring, monitor poisonous, harmful gas with, reduce environmental pollution, guarantee physical and mental health.Therefore, imperative for the development of gas sensing monitoring system, become the important topic that current sensing technology is researched and developed.
Gas detection mode mainly contains in the market: optical profile type, semiconductor-type, solid electrolyte formula, catalytic combustion type, electric chemical formula etc.Wherein optical profile type is highly sensitive with it, dynamic scan scope is large, and response speed is high, anti-electromagnetic interference (EMI) etc.And optical type gas sensing can be divided into according to detecting principle: absorption spectrum type, fluorescent type and interfere type etc.The advantages such as wherein absorption spectrum type is highly sensitive because of it, and reliability height and life-span are long, and there is market application foreground widely.Meanwhile, develop rapidly along with optical fiber sensing technology and Networks of Fiber Communications technology, utilize fibre ribbon roomy, be easy to feature into the net, non-maintaining, anti-interference, the highly sensitive gas detecting system of development a new generation, is up-to-date research trend in the world at present.Utilize wavelength-division multiplex technique, make a plurality of sensors share the cost that a Transmission Fibers and light source can reduce whole system greatly, and system networking facilitated the maintenance management of system, for optical fiber gas sensing system is moved towards the practical brand-new road of having opened up.
Particularly, spectral absorption type gas detection method, especially near-infrared absorption spectrum quantitative measurement technology is realized principle principle and is, material has different absorptions to the electromagnetic wave of different frequency, therefore the specific absorption line of gas with various is analyzed, according to the position of absorption line and intensity, determined composition and the concentration of molecule.Because the organic and inorganic pollution composition of majority all has Absorption Line at visible and infrared band, utilize these Absorption Lines can the various pollutant components of quantitative test.Conventionally Distributed Feedback Laser has very high spectral resolution because of it, and uses as the light source of detection of gas, utilize its to gas molecule to be measured the spectral absorption that turns line of shaking of in this spectral range measure, thereby realize the detection of gas concentration.
According to Bill-lambert's law, pass between output intensity I and incident intensity I0 and gas volume fraction is: I (v)=I0 (v) EXP[-a (v) CL], in formula, v is laser center frequency, I (v) is for light is by the transmitted light intensity after Absorption of Medium, and I0 (v) is for inciding the light intensity of medium, and a (v) is absorption coefficient, C is the concentration of medium, and L is the length that absorbs path.The spectrum of light source has covered the absorption line of gas, and light spectral line absorption has occurred after by gas.But when gas concentration is very little, the absorption peak of gas is also very little, and the variation of output intensity is also very little, and measurement effect is poor.
Summary of the invention
The utility model overcomes the deficiencies in the prior art, and a kind of gaseous spectrum absorption-type sensing device is provided, and volume is little, highly sensitive, simple in structure.
For achieving the above object, the technical solution of the utility model is: a kind of gaseous spectrum absorption-type sensing device, its difference is: it comprises shell, Distributed Feedback Laser, collimation lens, catoptron group, detector, lock-in amplifier, laser instrument driving and temperature control unit, microprocessor, liquid crystal display, described collimation lens and catoptron group are fixed on described shell, outer casing bottom leaves pore, between collimation lens and catoptron group, leave gap, each is penetrated and between mirror, all leaves gap.
By above technical scheme, described Distributed Feedback Laser is semiconductor laser diode.
By above technical scheme, described collimation lens connects Distributed Feedback Laser as the incident end of air chamber.
By above technical scheme, described catoptron group is to control light path by three arrangements of mirrors.
By above technical scheme, described detector is photodiode.
By above technical scheme, described lock-in amplifier, laser instrument driving and temperature control unit, microprocessor, liquid crystal display are integrated on a circuit board.
The utility model compared with prior art has following advantage:
1), signal processing unit, power supply unit and the display unit of this gaseous spectrum absorption-type sensing device be integrated on a circuit board, is easy to assembling, convenient operation;
2), this gaseous spectrum absorption-type sensing device adopts catoptron group to come and go transmissions, saved greatly the space resources installing and improved sensitivity and the accuracy of gas detection.
Accompanying drawing explanation
Fig. 1 is the total frame diagram of the utility model system;
Fig. 2 is air chamber structure schematic diagram in the utility model embodiment;
Wherein: 1-microprocessor, 2-lock-in amplifier, 3-PD detector, 4-air chamber, 5-DFB LD, the driving of 6-laser instrument and temperature control unit, 7-liquid crystal display, 8-shell, 9-DFB laser instrument, 10-optical fiber, 11-collimation lens, 12-the first catoptron, 13-the second catoptron, 14-the 3rd catoptron, 15-the first pore, 16-the second pore, 17-detector.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the novel a part of embodiment of this use, rather than whole embodiment.Embodiment in bright based on utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to Fig. 1 and Fig. 2, the utility model embodiment gaseous spectrum absorption-type sensing device, it comprises shell 8, Distributed Feedback Laser 9, collimation lens 11, catoptron group, detector 17, lock-in amplifier 2, laser instrument driving and temperature control unit 6, microprocessor 1, liquid crystal display 7, described collimation lens 11 is fixed on described shell 8 with catoptron group, pore is left in shell 8 bottoms, between collimation lens 11 and catoptron group, leave gap, each is penetrated and between mirror, all leaves gap.
Concrete, described Distributed Feedback Laser 9 is semiconductor laser diode.
Concrete, described collimation lens 11 connects Distributed Feedback Laser 9 as the incident end of air chamber 4.
Concrete, described catoptron group is to control light path by three arrangements of mirrors.
Concrete, described detector 17 is photodiode.
Concrete, described lock-in amplifier 2, laser instrument drive and temperature control unit 6, microprocessor 1, liquid crystal display 7 are integrated on a circuit board.
Therefore as shown in Figure 1, in the utility model embodiment, based on spectral absorption type second harmonics technique, methane gas is detected, its absorption spectra is near 1665nm, and institute's DFB LD5 centre wavelength of using is also 1665nm.Microprocessor 1 is controlled laser instrument driving and temperature control unit 6 makes laser instrument under the condition of power stability, export the sinusoidal modulation signal of 30kHZ, carries out the triangular voltage sweep of 100HZ in sweep bandwidth 0.2nm situation.Light signal is by air chamber 4, and air chamber 4 has been full of the methane gas of the environment of surveying, and PD detector 3 converts light signal to electric signal.Electric signal feeds back to microprocessor 1 again through lock-in amplifier 2, because the center mean wavelength of laser instrument has been aimed at the wavelength of methane gas absorption peak, the second harmonic component amplitude of gained 30K modulation signal is proportional to concentration of methane gas, therefore microprocessor 1 is processed just and can be waited until gas concentration accurately a little, finally on liquid crystal display 7, reads related data.
As shown in Figure 2, the air chamber of this gas sensing device comprises shell 8, Distributed Feedback Laser 9, collimation lens 11, the first catoptron 12, the second catoptron 13, the 3rd catoptron 14, detector 17.The first pore 15 and the second pore 16 are positioned at shell 8 bottoms to realize gas turnover circulation, and Distributed Feedback Laser 9 connects collimation lens 11 by optical fiber 10 and enters air chamber 4, and collimation lens 11 is for the laser beam of incident being carried out to shaping and reducing return loss.Light signal can come and go and transmit after entering air chamber 4 between the first catoptron 12 and the 3rd catoptron 14, and wherein the first catoptron 12 is plane mirror, and the 3rd catoptron 14 is spill catoptron.The second catoptron 13 is plane mirrors of a leptoprosopy shape, adjusts its angle and makes light signal be detected intact the receiving of device 17.Adjust the second catoptron 13 positions and angle and can change the light path size in air chamber 4, thereby realize the highly sensitive methane gas of small size, detect.
No matter the utility model is at harsh industrial condition or facilitate and all use good application prospect under civilian ecologic environment.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every any simple modification of above embodiment being done according to the utility model technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solutions of the utility model.
Claims (6)
1. a gaseous spectrum absorption-type sensing device, it is characterized in that: it comprises shell, Distributed Feedback Laser, collimation lens, catoptron group, detector, lock-in amplifier, laser instrument driving and temperature control unit, microprocessor, liquid crystal display, described collimation lens and catoptron group are fixed on described shell, outer casing bottom leaves pore, between collimation lens and catoptron group, leave gap, each is penetrated and between mirror, all leaves gap.
2. gaseous spectrum absorption-type sensing device as claimed in claim 1, is characterized in that: described Distributed Feedback Laser is semiconductor laser diode.
3. gaseous spectrum absorption-type sensing device as claimed in claim 1, is characterized in that: described collimation lens connects Distributed Feedback Laser as the incident end of air chamber.
4. gaseous spectrum absorption-type sensing device as claimed in claim 1, is characterized in that: described catoptron group is to control light path by three arrangements of mirrors.
5. gaseous spectrum absorption-type sensing device as claimed in claim 1, is characterized in that: described detector is photodiode.
6. gaseous spectrum absorption-type sensing device as claimed in claim 1, is characterized in that: described lock-in amplifier, laser instrument driving and temperature control unit, microprocessor, liquid crystal display are integrated on a circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320650520.8U CN203519490U (en) | 2013-10-21 | 2013-10-21 | Gas spectrum absorption-type sensing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320650520.8U CN203519490U (en) | 2013-10-21 | 2013-10-21 | Gas spectrum absorption-type sensing device |
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| CN203519490U true CN203519490U (en) | 2014-04-02 |
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| CN201320650520.8U Expired - Lifetime CN203519490U (en) | 2013-10-21 | 2013-10-21 | Gas spectrum absorption-type sensing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568830A (en) * | 2014-12-18 | 2015-04-29 | 武汉六九传感科技有限公司 | Photoelectric gas sensor and detection device |
| CN106940294A (en) * | 2017-03-24 | 2017-07-11 | 北京华夏艾科激光科技有限公司 | A kind of colliery wireless laser formula methane analyzer and assay method |
-
2013
- 2013-10-21 CN CN201320650520.8U patent/CN203519490U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568830A (en) * | 2014-12-18 | 2015-04-29 | 武汉六九传感科技有限公司 | Photoelectric gas sensor and detection device |
| CN106940294A (en) * | 2017-03-24 | 2017-07-11 | 北京华夏艾科激光科技有限公司 | A kind of colliery wireless laser formula methane analyzer and assay method |
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Granted publication date: 20140402 |
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| CX01 | Expiry of patent term |