CN101504366B - Oxygen concentration detecting instrument - Google Patents
Oxygen concentration detecting instrument Download PDFInfo
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- CN101504366B CN101504366B CN2009100715126A CN200910071512A CN101504366B CN 101504366 B CN101504366 B CN 101504366B CN 2009100715126 A CN2009100715126 A CN 2009100715126A CN 200910071512 A CN200910071512 A CN 200910071512A CN 101504366 B CN101504366 B CN 101504366B
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- light
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- diode laser
- oxygen concentration
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Abstract
The invention discloses an oxygen concentration detector, which belongs to the technical field of gas concentration detection. The invention aims to solve the problems that the prior oxygen detector based on spectrum technology has high cost due to using a single-mode diode laser and the output wavelength is sensitive to temperature change. An output end of a signal generator of the oxygen concentration detector is connected with an input end of a drive unit; an output end of the drive is connected with an input end of a tunable multimode diode laser; output light of the tunable multimode diode laser is transmitted by a collimating lens to form parallel light; the parallel light is split into transmitted light and reflected light through a spectroscope; the transmitted light passes through a sample cell, then is incident onto a first focusing lens for focusing and then incident onto a first photoelectric detector; the reflected light is taken as reference light and is incident onto a second photoelectric detector at last; two paths of light signals are converted into electric signals and then are input into a computer through an A/D converter; medium in the sample cell is oxygen to be tested; and the central wavelength of the tunable multimode diode laser is 760nm. The oxygen concentration detector is used for monitoring oxygen concentration.
Description
Technical field
The present invention relates to a kind of oxygen concentration detecting instrument, belong to the Gas Thickness Detecting Technology field.
Background technology
Accurate and low-cost measurement to oxygen concentration is all significant in fields such as environmental monitoring, biologic medical and industrial energy savings.At different concrete applications, people have been developed various different types of oxygen analysers, and measuring principle mainly is based on solid state electrolysis method, paramagnetic method, electro-chemical cell method, chemoluminescence method etc.Yet above these several technology all are contact measurements, occur easily making the sniffer intoxicating phenomenon in commercial Application, and the sensing probe corrosion-vulnerable, influence the serviceable life of instrument, in use need often calibration could guarantee the accuracy of measuring.
By contrast, have based on the oxygen measurement set of laser spectrum tech that noncontact, response speed are fast, the advantage of long service life.Especially the advantage that has highly sensitive, low energy consumption, miniaturization based on the oxygen determination instrument of tunable diode laser absorption spectroscopy technology (TDLAS) especially.But the shortcoming of TDLAS technology is: in order to realize the measurement to object gas, single mode output to light source has very high requirement, common TDLAS system must use the single mode laser diodes laser instrument could satisfy the requirement of this output, and the process complexity of single mode laser diodes laser instrument causes its cost very high.In addition, the output wavelength of single mode laser diodes laser instrument is very responsive to temperature change, must adopt strict temperature control facility, this has improved the complicacy of system, even and like this be difficult to also guarantee that instrument realizes steady in a long-term the measurement in industrial environment complicated and changeable, so limited widespread use based on the oxygen analyser of TDLAS technology.
Summary of the invention
The objective of the invention is to solve existing oxygen analyser based on spectral technique uses single mode laser diodes laser instrument cost height, output wavelength to the temperature variation sensitive issue, a kind of oxygen concentration detecting instrument that adopts tunable multimode diode laser is provided, it utilizes airborne oxygen as reference gas, realizes the detection to oxygen concentration.
The present invention is by signal generator, driver, tunable multimode diode laser, collimation lens, spectroscope, sample cell, first condenser lens, first photodetector, reflector group, second condenser lens, second photodetector, A/D converter and computing machine are formed, an output terminal of signal generator connects the input end of driver, output end of driver connects the input end of tunable multimode diode laser, the output light of tunable multimode diode laser incides in the collimation lens, obtain directional light through the collimation lens transmission, described directional light is divided into transmitted light and reflected light through spectroscope, described transmitted light incides first condenser lens through behind the sample cell, after focusing on, first condenser lens incides the light signal input end of first photodetector, described reflected light incides second condenser lens after the reflector group reflection, after focusing on, second condenser lens incides the light signal input end of second photodetector, another output terminal of signal generator connects the first input end of A/D converter, the electrical signal of first photodetector connects second input end of A/D converter, the electrical signal of second photodetector connects the 3rd input end of A/D converter, the output terminal of A/D converter connects input end and computer, medium in the sample cell is an oxygen gas to be measured, and the centre wavelength of tunable multimode diode laser is 760nm.
Advantage of the present invention is:
The present invention can be implemented under the situation that monitoring instrument is in environment complicated and changeable accurate detection to oxygen concentration.Possessing on highly sensitive, the high basis of selecting, responding fast of TDLAS technology, by adopting simple, the cheap tunable multimode diode laser of 760nm of production technology as light source, the cost of multimode diode laser is 1/10th of a similar single mode laser diodes laser instrument only, greatly reduces the cost of measurement mechanism; Utilize airborne oxygen to do in good time related calibration by introducing the associated light spectral technology, the stability requirement of laser output wavelength is reduced greatly, measurement result is no longer responsive to variation of ambient temperature, has improved long-term measuring stability.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, present embodiment is by signal generator 1, driver 2, tunable multimode diode laser 3, collimation lens 4, spectroscope 5, sample cell 6, first condenser lens 7, first photodetector 8, reflector group 9, second condenser lens 10, second photodetector 11, A/D converter 12 and computing machine 13 are formed, an output terminal of signal generator 1 connects the input end of driver 2, the output terminal of driver 2 connects the input end of tunable multimode diode laser 3, the output light of tunable multimode diode laser 3 incides in the collimation lens 4, obtain directional light through collimation lens 4 transmissions, described directional light is divided into transmitted light and reflected light through spectroscope 5, described transmitted light incides first condenser lens 7 through behind the sample cell 6, after focusing on, first condenser lens 7 incides the light signal input end of first photodetector 8, described reflected light incides second condenser lens 10 after reflector group 9 reflections, after focusing on, second condenser lens 10 incides the light signal input end of second photodetector 11, another output terminal of signal generator 1, the electrical signal of first photodetector 8 and second photodetector 11 is connected an input end of A/D converter 12 respectively, the output terminal of A/D converter 12 connects the input end of computing machine 13, medium in the sample cell 6 is an oxygen gas to be measured, and the centre wavelength of tunable multimode diode laser 3 is 760nm.
The wavelength of tunable multimode diode laser 3 is that 760nm-765nm is adjustable.
Principle of work: signal generator 1 is f by frequency
1Sine wave modulation to produce frequency be f
2Sawtooth wave, f
1Frequency greater than f
2100 times of frequency, sawtooth signal are loaded into and carry out tuning and modulation to the output light frequency of tunable multimode diode laser 3 on the driver 2 of tunable multimode diode laser 3, make the output light frequency at f
1Under the frequency oscillation with f
2The inswept 760nm of frequency near the oxygen absorption line; The output light of tunable multimode diode laser 3 is divided into the two-way light beam by a collimation lens 4 collimation back by a spectroscope 5: lead up to behind the sample cell 6 that unknown concentration oxygen is housed, incide on the light receiving surface of first photodetector 8 after being focused on by first condenser lens 7; Another road is incided on the light receiving surface of second photodetector 11 after being focused on by second condenser lens 10 by a reflector group 9 backs as reference light; The electric signal that the two-way photodetector produces becomes digital electric signal by A/D converter 12 with analog signal conversion, is input to computing machine 13 then and handles.The TTL trigger pip that signal generator 1 produces is used for the analog-digital conversion process of synchronous A/D converter 12, guarantees the synchronism of sample signal and reference signal.Computing machine 13 demodulates frequency from the band modulated digital signal be 2f
1Second harmonic signal, and according to calculating formula C
s=A
s(ω
0) I
0rL
rC
r/ A
r(ω
0) I
0sL
sDraw the oxygen concentration in the gas to be measured.C in the formula
sBe the oxygen concentration to be measured that contains in the sample cell, A
s(ω
0) be the second harmonic signal of sample light, I
0sFor inciding the initial light intensity of sample cell, C
rBe airborne oxygen concentration, L
rBe the optical length of reference light by air, A
r(ω
0) be the second harmonic signal of reference light, I
0rFor reference light incides the initial light intensity of air, L
sBe the optical length of sample light by sample cell.
Embodiment two: the difference of present embodiment and embodiment one is that reflector group 9 is made up of a plurality of catoptrons, and the light that incides reflector group 9 incides described second condenser lens 10 through after the reflection of each catoptron.Other composition and connected mode are identical with embodiment one.
The effect of reflector group 9 is to allow reference light pass through longer absorption light path in limited space, improves the signal to noise ratio (S/N ratio) of reference signal, thereby improves the precision of measuring.
Claims (2)
1. oxygen concentration detecting instrument, it is characterized in that it is by signal generator (1), driver (2), tunable multimode diode laser (3), collimation lens (4), spectroscope (5), sample cell (6), first condenser lens (7), first photodetector (8), reflector group (9), second condenser lens (10), second photodetector (11), A/D converter (12) and computing machine (13) are formed, an output terminal of signal generator (1) connects the input end of driver (2), the output terminal of driver (2) connects the input end of tunable multimode diode laser (3), the output light of tunable multimode diode laser (3) incides in the collimation lens (4), obtain directional light through collimation lens (4) transmission, described directional light is divided into transmitted light and reflected light through spectroscope (5), incide first condenser lens (7) behind the described transmitted light process sample cell (6), after focusing on, first condenser lens (7) incides the light signal input end of first photodetector (8), described reflected light incides second condenser lens (10) after reflector group (9) reflection, after focusing on, second condenser lens (10) incides the light signal input end of second photodetector (11), another output terminal of signal generator (1) connects the first input end of A/D converter (12), the electrical signal of first photodetector (8) connects second input end of A/D converter (12), the electrical signal of second photodetector (11) connects the 3rd input end of A/D converter (12), the output terminal of A/D converter (12) connects the input end of computing machine (13), medium in the sample cell (6) is an oxygen gas to be measured, and the centre wavelength of tunable multimode diode laser (3) is 760nm.
2. oxygen concentration detecting instrument according to claim 1 is characterized in that reflector group (9) is made up of a plurality of catoptrons, and the light that incides reflector group (9) incides described second condenser lens (10) through after the reflection of each catoptron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100715126A CN101504366B (en) | 2009-03-10 | 2009-03-10 | Oxygen concentration detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100715126A CN101504366B (en) | 2009-03-10 | 2009-03-10 | Oxygen concentration detecting instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101504366A CN101504366A (en) | 2009-08-12 |
| CN101504366B true CN101504366B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100715126A Expired - Fee Related CN101504366B (en) | 2009-03-10 | 2009-03-10 | Oxygen concentration detecting instrument |
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| CN105548075A (en) * | 2016-01-08 | 2016-05-04 | 楚天科技股份有限公司 | Device and method for detecting oxygen content in glass medicine bottle |
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| CN106769976B (en) * | 2016-11-24 | 2018-01-16 | 安徽庆宇光电科技有限公司 | Laser control module for gas analysis |
| CN106596444A (en) * | 2016-12-08 | 2017-04-26 | 哈尔滨工业大学 | Oxygen concentration measuring system based on ultraviolet broadband absorption spectrum and measuring method |
| EP3502637A1 (en) * | 2017-12-23 | 2019-06-26 | ABB Schweiz AG | Method and system for real-time web manufacturing supervision |
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| CN110567911A (en) * | 2019-09-30 | 2019-12-13 | 大连艾科科技开发有限公司 | Device for detecting oxygen concentration in inflammable gas and application thereof |
| CN117169855A (en) * | 2023-10-24 | 2023-12-05 | 齐鲁空天信息研究院 | Dual wavelength laser radar device |
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2009
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Patent Citations (5)
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|---|---|---|---|---|
| US6150661A (en) * | 1993-04-16 | 2000-11-21 | Bruce W. McCaul | Gas spectroscopy |
| GB2286458A (en) * | 1994-02-04 | 1995-08-16 | Marconi Gec Ltd | An optical absorption oxygen sensor |
| CN1563946A (en) * | 2004-04-09 | 2005-01-12 | 哈尔滨工业大学 | SO2 gas density monitoring and its monitoring method |
| CN101008604A (en) * | 2007-01-26 | 2007-08-01 | 中北大学 | On-line testing method for aerosol particles concentration and size and testing device thereof |
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| 崔厚欣 等.可调谐激光波长调制技术检测氧气浓度.《中国激光》.2008,第35卷(第10期),1558－1562. * |
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| CN101504366A (en) | 2009-08-12 |
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