CN100460860C - Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor - Google Patents
Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor Download PDFInfo
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- CN100460860C CN100460860C CNB2005101121362A CN200510112136A CN100460860C CN 100460860 C CN100460860 C CN 100460860C CN B2005101121362 A CNB2005101121362 A CN B2005101121362A CN 200510112136 A CN200510112136 A CN 200510112136A CN 100460860 C CN100460860 C CN 100460860C
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Abstract
Disclosed is an absorption mash gas detecting method for of portable infrared semi-conductor laser, which comprises: employing infrared laser of 1.33mum or1.665mum generated by infrared light-emitting diode, making the incidence laser inject into a small chamber with limited space which is connected with the mash gas filed and generate harmonic oscillation in the gas chamber; then transmitting the testing photoelectricity signal after converting to the signal processing terminal via another infrared absorption gas sensor installed in the gas chamber; deciding whether warning or not after judging by the signal processing terminal.
Description
Technical field
The present invention establishes and a kind of portable infrared semiconductor laser absorbing type methane gas detection method and device, belongs to the laser measuring technology class, and the scene that is used in coal mine gas concentration is detected.
Background technology
Methane is the major part of flammable explosive gas and pluralities of fuel, lower explosive limit in atmosphere is to be limited to 15.4% on 4.9%, the methane blast always is one of the important disaster in colliery, in order to prevent the generation of explosion accident, it is very necessary that ambient gas is carried out early stage safety detection, in time detect the volume fraction of methane gas, important effect is arranged for industrial and mineral safe operation and personal safety.
Infrared gas senor has the accuracy of detection height, is suitable for the concentration range of broad, and the advantage of long service life is with the gas detector that progressively replaces in the past.
At present, the methane gas sensor that generally uses all is interference-type optical fiber methane transducers both at home and abroad, this sensor is done light source with light emitting diode, and the method that adopts two-beam to interfere detects change of refractive in the air chamber, and change of refractive is directly relevant with the concentration of methane gas.But in order to reach necessary image data precision, there are two main problems in this type of sensor:
One, gathers the necessary air cell size excessive (being generally 0.5 meter) of gas sample, be not easy to that the staff carries and detect the concentration of methane gas in real time;
Two, it is all relatively poor that this class sensor needs frequent adjustment, its reliability and stability.Therefore, this type of light source is because infrared light supply can't be realized miniaturization in the restriction of stability and the energy consumption in source and volume etc.
Therefore, how to design and propose a kind of than miniaturization, be easy to carry and the on-the-spot ore deposit of installing, using under the concentration timely monitor method and the checkout equipment of methane gas, oneself is through becoming the big problem of domestic and international relevant industries and the vivid concern of commonwealthn.
Summary of the invention
Purpose of the present invention: be intended to propose a kind of on-the-spot portable infrared semiconductor laser absorbing type methane gas detection method and device that uses under the ore deposit that be applicable to.Not only wish its miniaturization, be convenient to on-the-spot the use, and response is sensitive, dynamic range is big, the anti-electromagnetic interference (EMI) of energy, burn-proof and explosion prevention.
This portable infrared semiconductor laser absorbing type methane gas detection method, it is characterized in that: described detection method is to inject a finite space by the laser that infrared semiconductor laser is produced to produce the resonance light wave, form the resonance optical cavity that increases light path, and by being located at another near infrared absorption formula gas sensor in the optical cavity, form the enough detection light paths in the finite space, thereby reach the gas detection under the miniaturization air chamber condition.
It adopts the laser of the infrared laser emitting diode B generation that can launch 1.33um or 1.665um wavelength, allow this laser transmit through optical fiber F, inject a miniaturization finite space air chamber that is connected with the gas scene of taking place in the ore deposit with the pulsed light form, and in this finite space air chamber A, produce resonance formation resonance light wave; Then after opto-electronic conversion, be transferred to signal Processing end E by being located at the test signal that another near infrared absorption formula gas sensor C in the air chamber A will have enough light paths; By making alarm decision after the signal Processing end E judgement.
This portable infrared semiconductor laser absorbing type methane gas pick-up unit, the specification of its open resonance air chamber A is 20cm * 10cm * 5cm, the infrared laser emitting diode B that adopts is the OPE13F-C31-H11 type infrared-emitting diode B that is produced by the difficult to understand general photoelectricity in Shanghai company limited, the sensor that is adopted is absorption-type Fibre Optical Sensor C, and the laser of being injected is the pulse type laser by the infrared laser emitting diode B generation of emission 1.33um or 1.665um wavelength.
In use, can in the transmission line of infrared laser emitting diode B, be connected in series automatic temperature-controlled circuit ATC and automatic power controller APC.
This portable infrared semiconductor laser absorbing type methane gas pick-up unit according to above technical scheme proposition, owing to adopted the air chamber space that dwindles greatly, and at the infrared line at 1.33um or 1.665um place the peculiar absorptive character of laser, the pulse laser that adopts the far infrared emitting diode to produce are entered the air chamber space according to methane, and in this limited air chamber space, make incident light produce resonance effect generation resonance light wave, form irregular multipath reflection path; Reached and to have dwindled the sampler space greatly, increased enough detection light path amount purposes, made accurately, obtain test result fast and become possibility.Thereby be the realization of portable infrared semiconductor laser absorbing type methane gas detection method and device, strong technical support is provided.
Description of drawings
Accompanying drawing is a synoptic diagram of the present invention.
Among the figure: A, air chamber B, infrared laser emitting diode C, absorption-type Fibre Optical Sensor, D, incident lens E, signal Processing end F, optical fiber
Embodiment
What accompanying drawing provided is schematic diagram of the present invention, also is the connection diagram of its device.
Further set forth the present invention below in conjunction with accompanying drawing, and provide embodiments of the invention.
This portable infrared semiconductor laser absorbing type methane gas detection method and device that the present invention provides; Innovative design thought of the present invention mainly concentrates on the gas resonator cavity, and design concept is Fa Buli-pool Luo Yuanli.
It is can penetrate so that order takes place repeatedly to roll over (instead) with the light of low-angle incident in the gas resonator cavity a kind of inventive improvements design of the existing coal-mine gas test miniaturization of generally using both at home and abroad, to reach the purpose that increases light path, and then make light fully contact with gas to be measured, thereby both reduced the size of traditional air chamber, can guarantee the precision of image data again.
This portable infrared semiconductor laser absorbing type methane gas detection method, it is characterized in that: described detection method is to inject a finite space by the laser that infrared semiconductor laser is produced to produce the resonance light wave, form the resonance optical cavity that increases light path, and by being located at another near infrared absorption formula gas sensor in the optical cavity, form the enough detection light paths in the finite space, thereby reach the gas detection under the miniaturization air chamber condition.
Its method is: employing can be launched the laser of the infrared laser emitting diode B generation of 1.33um or 1.665um wavelength, allow this laser with the pulsed light form, pass incident lens D and inject a miniaturization finite space air chamber A who is connected with the gas scene of taking place in the ore deposit, and in this finite space air chamber, produce resonance; Then, test signal is transferred to signal Processing end E after opto-electronic conversion by being located at another near infrared absorption formula gas sensor C in the air chamber; By making alarm decision after the signal Processing end E judgement.
The specification of the open resonance air chamber of described limited miniaturization A is 20cm * 10cm * 5cm, this design can so that order with the laser beam of low-angle incident, make in the air chamber A of small dimension space that indoor gas produces resonance, repeatedly folding (instead) is penetrated, to reach the purpose that increases light path, assurance is used for the near infrared absorption formula gas sensor of methane Concentration Measurement, obtains enough detection light paths in the finite space; And then make light fully contact with gas to be measured, thus both reduced the size of traditional air chamber, can guarantee the precision of image data again.
The infrared laser emitting diode B that adopts is the OPE13F-C31-H11 type infrared-emitting diode of being produced by the difficult to understand general photoelectricity in Shanghai company limited; The absorption-type sensor that is adopted is absorption-type Fibre Optical Sensor C, and the laser of being injected is the pulse type laser by the infrared laser emitting diode generation of emission 1.33um or 1.665um wavelength.
The present invention is intended to solve the gas detection precision, detects unstable properties and the excessive problem of air cell size, and the novel light path resonance optical cavity that shortens of invention design replaces original traditional air chamber, to reach instrument miniaturization; The notion of introducing Difference Absorption simultaneously is in whole light path design, thereby solution gas detection precision is low and the problem of detection unstable properties.
The principle of concrete technical scheme is as follows:
Use methane at the infrared line at wavelength 1.665um, 1.33um place principle of absorption, develop new pattern laser methane (gas) sensor laser.Because the peculiar property of methane spectral line is easy to it and air are made a distinction with other gas, thereby the measuring accuracy height, the instantaneity that absorbs because of spectral line can be finished fast so measure again.
Utilize the high Q resonance optical cavity in " cavity reinforced absorption spectrum " design 1.33um or the absorption methane gas detector of 1.665um wavelength semiconductor infrared laser, to reach the effect of miniaturization tradition air chamber.
High Q resonance optical cavity action principle is different from traditional White air chamber, the size of optical cavity proportional with the wavelength of incident laser (long coherence mutually), thus make incident light in optical cavity, produce resonance effect, form and do not advise folding multiple reflection path.This effect is similar to the LC oscillation circuit in the electronic circuit, greatly reduces the energy loss of incident light in optical cavity.Based on the methane gas sensor of the high Q resonance of this kind optical cavity design, the incident angle selectional restriction that incident laser enters optical cavity is very little; Incident light can adopt impulse form, greatly reduces the energy consumption of whole instrument, has solved the problem that traditional air chamber thermal value is big, heat radiation is difficult simultaneously, and the design of high Q resonance optical cavity is the innovation core of present technique.
Therefore, the miniaturization novel open type gas resonator cavity air chamber (long 20cm, wide 10cm, high 5cm) of design of the present invention is to replace original traditional large scale air chamber fully, notion with Difference Absorption is applied to whole light path design simultaneously, reduce systematic error and stochastic error, thereby solution gas detection precision is low and the problem of detection unstable properties.
In addition, existing 1.33um wavelength laser light source (the infrared laser emitting diode OPE13F-C31-H11 that the difficult to understand general photoelectricity in Shanghai company limited produces) part is optimized design, such as adding automatic temperature-controlled circuit ATC and automated power control APC etc., to reduce the influence of light source to accuracy of detection.
As further improvement to this system, sensor and embedded system can be combined, the data of optical receiver PIN are carried out analog to digital conversion, when reaching detected gas concentration, can finish data storage, demonstration and alarm; Realize the intelligentized updating of this method and this device.
In addition, this by the laser of infrared semiconductor laser generation being injected finite space generation resonance light wave, form the resonance light wave that increases light path, thereby reach the gas detection under the miniaturization air chamber condition.Also can be applied to other mines that need carry out the gas concentration monitoring, the specific occasion of enterprise.
Claims (4)
1. portable infrared semiconductor laser absorbing type methane gas detection method, it is characterized in that: described detection method is to inject a small-sized finite space by the laser that infrared semiconductor laser is produced to produce the resonance light wave, form the resonance optical cavity that increases light path, and by being located at another near infrared absorption formula gas sensor in the optical cavity, form the enough detection light paths in the finite space, thereby reach the gas detection under the miniaturization air chamber condition.
2. a kind of portable infrared semiconductor laser absorbing type methane gas detection method as claimed in claim 1, it is characterized in that: its utilization methane is at the principle of absorption of the infrared line at wavelength 1.665um, 1.33um place, employing can be launched the laser of the infrared laser emitting diode generation of 1.33um or 1.665um wavelength, allow this laser transmit through optical fiber (F), inject a small-sized finite space air chamber that is connected with the gas scene of taking place in the ore deposit with the pulsed light form, and in this finite space air chamber, produce resonance, form the resonance light wave; Then test signal is transferred to the signal Processing end after opto-electronic conversion by another near infrared absorption formula gas sensor of being located in the air chamber; By making alarm decision after the judgement of signal Processing end.
3. a kind of according to claim 1 portable infrared semiconductor laser absorbing type methane gas detection method, specification 20cm * 10cm * the 5cm of the open resonance air chamber (A) of its pick-up unit, the infrared laser emitting diode that adopts (B) are the OPE13F-C31-H11 type infrared-emitting diodes of being produced by the difficult to understand general photoelectricity in Shanghai company limited; The sensor that is adopted is absorption-type Fibre Optical Sensor (C), and the laser of being injected is the pulse type laser by the infrared laser emitting diode generation of emission 1.33um or 1.665um wavelength.
4. as a kind of portable infrared semiconductor laser absorbing type methane gas detection method as described in the claim 2, be characterised in that: when its pick-up unit uses, automatic temperature-controlled circuit ATC of serial connection and automatic power controller APC in the transmission line of infrared laser emitting diode.
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| CN100460860C true CN100460860C (en) | 2009-02-11 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100590419C (en) * | 2006-10-17 | 2010-02-17 | 中国科学院安徽光学精密机械研究所 | New nodal real time gas concentration monitoring method and sensor |
| CN101592600B (en) * | 2008-05-28 | 2011-04-20 | 北京市加华博来科技有限公司 | Quick-response infrared gas senor with high sensitivity |
| CN101592601B (en) * | 2008-05-28 | 2011-07-20 | 北京市加华博来科技有限公司 | High-efficiency infrared gas sensor with small volume |
| CN101592603B (en) * | 2008-05-29 | 2011-01-12 | 北京市加华博来科技有限公司 | Infrared gas sensor with low energy consumption |
| CN101567120B (en) * | 2009-04-27 | 2011-04-20 | 中北大学 | Portable infrared gas alarm apparatus |
| CN101625306B (en) * | 2009-08-03 | 2011-01-05 | 浙江大学 | Device for measuring gas concentration |
| CN102590092B (en) * | 2012-03-07 | 2013-09-25 | 哈尔滨工业大学 | Absorption optical path lengthening device and method for laser absorption spectroscopy technology |
| CN104142308A (en) * | 2013-05-08 | 2014-11-12 | 浙江师范大学 | FENO detection system based on broadband light source cavity enhanced absorption spectroscopy |
| CN103954577B (en) * | 2014-05-11 | 2016-03-30 | 西安安通测控技术有限公司 | A kind of miniature infrared gas detection sensor |
| CN104535531A (en) * | 2014-12-15 | 2015-04-22 | 北京航天易联科技发展有限公司 | Handheld laser gas concentration monitor and control method thereof |
| CN105784621A (en) * | 2016-05-16 | 2016-07-20 | 青岛市光电工程技术研究院 | Device for detecting sulfur dioxide in marine exhaust gas based on unmanned aerial vehicle platform |
| CN107991238A (en) * | 2017-12-29 | 2018-05-04 | 汉威科技集团股份有限公司 | A kind of laser methane gas sensor |
| CN109490255A (en) * | 2018-11-27 | 2019-03-19 | 苏州仓江行电子科技有限公司 | A kind of online gas detection analytical equipment of laser and method |
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