CN101271064B - Gas monitoring alarm device based on gas absorption frequency stabilized laser - Google Patents
Gas monitoring alarm device based on gas absorption frequency stabilized laser Download PDFInfo
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- CN101271064B CN101271064B CN2008100477176A CN200810047717A CN101271064B CN 101271064 B CN101271064 B CN 101271064B CN 2008100477176 A CN2008100477176 A CN 2008100477176A CN 200810047717 A CN200810047717 A CN 200810047717A CN 101271064 B CN101271064 B CN 101271064B
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Abstract
The invention relates to a gas monitoring and alarm system based on a gas-absorbing frequency stabilizing laser, which consists of a central control unit, a frequency stabilizing laser assembly component, a temperature control unit, a current control unit, a display/ alarm/ communication/ human-machine interface, a detecting and amplifying unit and a signal processing unit; the frequency stabilizing laser assembly component has a structure of T-shaped pipe shell 6; three mouths of the T-shaped pipe shell 6 are provided a laser 1, a reference detector 2 and a light output device 4 which are packaged on the same shaft; a membrane 3 is arranged before the light output device 4; the membrane 3 is adhered on a membrane seat 5; reference gas is sealed in the space of the T-shaped pipe shell 6 and forms a reference gas chamber. The device makes full use of the redundant space in a part, integrates the reference gas chamber to the laser assembly component, so that the entire structure of the part is compact and low in cost; the reference gas is not affected by the temperature of the outside environment, which is good for precisely locking the wave length.
Description
Technical field
The present invention relates to monitoring and warning, be specifically related to a kind of principle that adopts the gas molecule optical absorption spectra, with the device of frequency stabilized laser monitoring gas concentration and overload alarm gas concentration.
Background technology
The gas molecule optical absorption spectra is just as the mankind's fingerprint, and the absorption spectrum that utilizes gas molecule is the effective means that gaseous species identification and gas molecular conecentration are measured.Along with the quickening of process of industrialization, major hazard source, major accident hidden danger kind and quantity will be on the increase, and will propose requirements at the higher level to the safety in production scientific and technical research, form huge demand.In industries such as electric power, metallurgy, petrochemical industry, production run can relate to be used or the generation all gases, as CO, CO
2, CH
4Deng.On the one hand, in the industrial process concentration of these gases control bad, can cause production efficiency low, energy consumption raises; On the other hand in case from transmission pipeline, leak, the light then safety that jeopardizes production facility and equipment, the heavy then life security that jeopardizes the field personnel.Therefore; seek a kind of on-the-spot fast and effectively gas detection method in real time; for enhancing productivity, cut down the consumption of energy and ensureing for the safety of life and production is vital, and fields such as electric power, metallurgy, oil, chemical industry, environmental protection and health and epidemic prevention solve the detection and the early warning problem of multiple gases concentration with regard to needs.Wherein, series of advantages such as that the laser detection method of utilizing gas characteristic to absorb line has is highly sensitive, selectivity is strong, non-maintaining and long service life are to develop emerging gas detection technology rapidly recently during the last ten years.Its good technical development prospect is subjected to the researcher and the user's of domestic and international association area extensive attention day by day.Gas-detecting device usually needs to be installed in the industrial enterprise scene, promptly needs to be in the environment such as high temperature, vibration, dust, and optical device is under such environment, the long-term work performance can be unstable, its optical frequency can produce drift, therefore, must adopt frequency stabilized laser locking spectrum.Reference gas chamber is the important component part of frequency stabilized laser, and prior art after laser instrument uses a period of time, needs the serviceability of manual calibration laser instrument owing to do not adopt frequency stabilized laser.
Summary of the invention
The objective of the invention is to utilize the coaxial packaging technology of ripe semiconductor photoelectric device in order to overcome the deficiency that prior art exists, the design frequency stabilized laser provides a kind of low cost, high precision, non-maintaining gas monitoring alarm device.
Technical solution of the present invention is: a kind of gas monitoring alarm device based on gas absorption frequency stabilized laser comprises central control unit, Frequency Stabilized Lasers assembly, temperature conditioning unit, current control unit, demonstration/warning/communication/human and machine interface unit, detection and amplifying unit and signal processing unit.The temperature of temperature conditioning unit control Frequency Stabilized Lasers assembly also can be provided with the temperature that radiating subassembly is controlled the Frequency Stabilized Lasers assembly.
The Frequency Stabilized Lasers assembly is to utilize existing communication with space in the assembly in the single fiber bi-directional device coaxial packaging structure and the characteristics of underusing, and reference gas chamber is installed in the assembly.The Frequency Stabilized Lasers assembly is a T type shell structure, and in T type shell, three mouths are loaded onto laser instrument, reference detector and light follower respectively.Added a half-reflection and half-transmission diaphragm that 45 is placed in the middle of the T type shell, this diaphragm advances detector as reference light with a part of laser-bounce.The output of the forward direction of laser instrument generally be coupled away by optical fiber, directly exports after also can adopting collimation lens with beam collimation as required.Be full of the reference gas identical of specific concentrations in this assembly with monitored gas.
Radiating subassembly comprises refrigerator TEC, thermistor and radiating block, controls by the circuit of temperature conditioning unit assembly is carried out temperature survey and control.
Current control unit utilizes the output signal noise spectra of semiconductor lasers of reference detector to carry out Current Control, makes wavelength stabilized laser on the gas absorption peak.
Detection and amplifying unit detect by the laser signal behind the tested gas, and via after the signal processing unit processes, calculate gas concentration by central control unit, again the result is outputed to demonstration/warning/communication/human and machine interface unit, realize functions such as concentration demonstration, warning, communication.
The invention has the beneficial effects as follows: made full use of the redundant space of device inside, reference gas chamber is integrated in the laser assembly, made the device compact overall structure; And packaging technology is simple, and the device package material obtains easily, and cost is lower.Advantage of the present invention also is, because case temperature is controlled, also can be controlled in the reference gas temperature of air chamber the inside, and the reference gas in the reference gas chamber can not be subjected to the influence of ambient temperature like this, more helps the accurate locking of wavelength.
Description of drawings
The structured flowchart of Fig. 1 apparatus of the present invention.
The Frequency Stabilized Lasers modular construction synoptic diagram of the band optical fiber output of Fig. 2 apparatus of the present invention
The Frequency Stabilized Lasers modular construction synoptic diagram of the band collimated light output of Fig. 3 apparatus of the present invention
1. laser instruments among the figure, 2. reference detector, 3. diaphragm, 4. smooth follower, 5. diaphragm seat, 6.T type shell.
Embodiment
The present invention is described further below in conjunction with accompanying drawing:
A kind of gas monitoring alarm device structured flowchart based on gas absorption frequency stabilized laser as shown in Figure 1.Form by central control unit, Frequency Stabilized Lasers assembly, temperature conditioning unit, current control unit, demonstration/warning/communication/man-machine interface, detection and amplifying unit, signal processing unit.The temperature of temperature conditioning unit control Frequency Stabilized Lasers assembly.
Frequency Stabilized Lasers assembly of the present invention such as Fig. 2, shown in Figure 3, the Frequency Stabilized Lasers assembly is T type shell 6 structures, three mouths at T type shell 6 adopt coaxial packaging that laser instrument 1, reference detector 2 and light follower 4 are arranged, the diaphragm 3 that 45 is placed is set before light follower 4, diaphragm 3 is bonded on the diaphragm seat 5, diaphragm 3 is divided into two-way with laser, and reflectivity and transmissivity are controlled by the diaphragm plated film.In the space of T type shell 6, be sealed with reference gas, form reference gas chamber.Light follower 4 its output signals both can be optical fiber coupling output, can be again directly to export collimated light by collimation lens.
The laser of Frequency Stabilized Lasers assembly output is through the diaphragm 3 back parts into reference detector 2 that is reflected, and a part of in addition laser enters behind the light follower 4 through tested gas, by surveying and amplifying unit detects measured signal.The reference signal part of reference detector 2 outputs feeds back to current control unit, makes laser instrument 1 Wavelength stabilized on the gas absorption peak by current control unit controlling and driving electric current.A part of in addition reference signal is passed to central control unit, calculates gas concentration after comparing with measured signal.According to gas with various absorption intensity difference, the reference gas chamber length of requirement is also different, can change the length of reference gas chamber by the distance that changes reference detector 2 and diaphragm 3.Central control unit is realized functions such as demonstration, communication, interface control by demonstration/warning/communication/human and machine interface unit; When gas concentration reaches setting value, produce and report to the police.
Claims (4)
1. gas monitoring alarm device based on gas absorption frequency stabilized laser, by central control unit, the Frequency Stabilized Lasers assembly, temperature conditioning unit, current control unit, demonstration/warning/communication/man-machine interface, survey and amplifying unit, signal processing unit is formed, it is characterized in that the Frequency Stabilized Lasers assembly is T type shell (a 6) structure, three mouths at T type shell (6) adopt coaxial packaging that laser instrument (1) is arranged, reference detector (2) and light follower (4), at the preceding diaphragm (3) that the 45 placement is set of light follower (4), diaphragm (3) is bonded on the diaphragm seat (5), in the space of T type shell (6), be sealed with reference gas, form reference gas chamber.
2. gas monitoring alarm device as claimed in claim 1 is characterized in that diaphragm (3) is a part reflective semitransparent film.
3. gas monitoring alarm device as claimed in claim 1 is characterized in that light follower (4) is a coupled fiber.
4. gas monitoring alarm device as claimed in claim 1 is characterized in that light follower (4) is a collimation lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100477176A CN101271064B (en) | 2008-05-13 | 2008-05-13 | Gas monitoring alarm device based on gas absorption frequency stabilized laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100477176A CN101271064B (en) | 2008-05-13 | 2008-05-13 | Gas monitoring alarm device based on gas absorption frequency stabilized laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101271064A CN101271064A (en) | 2008-09-24 |
| CN101271064B true CN101271064B (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100477176A Expired - Fee Related CN101271064B (en) | 2008-05-13 | 2008-05-13 | Gas monitoring alarm device based on gas absorption frequency stabilized laser |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2513127Y (en) * | 2001-10-30 | 2002-09-25 | 福州康顺光通讯有限公司 | Single fibre two-way receiving and transmitting module |
| CN101034073A (en) * | 2006-03-07 | 2007-09-12 | 林珠美 | Gas detecting alarm system |
| WO2008030250A2 (en) * | 2006-09-07 | 2008-03-13 | William Marsh Rice University | Integrated embedded processor based laser spectroscopic sensor |
| CN201199229Y (en) * | 2008-05-13 | 2009-02-25 | 张哲民 | Gas monitoring alarm device based on gas absorption frequency stabilized laser |
-
2008
- 2008-05-13 CN CN2008100477176A patent/CN101271064B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2513127Y (en) * | 2001-10-30 | 2002-09-25 | 福州康顺光通讯有限公司 | Single fibre two-way receiving and transmitting module |
| CN101034073A (en) * | 2006-03-07 | 2007-09-12 | 林珠美 | Gas detecting alarm system |
| WO2008030250A2 (en) * | 2006-09-07 | 2008-03-13 | William Marsh Rice University | Integrated embedded processor based laser spectroscopic sensor |
| CN201199229Y (en) * | 2008-05-13 | 2009-02-25 | 张哲民 | Gas monitoring alarm device based on gas absorption frequency stabilized laser |
Non-Patent Citations (3)
| Title |
|---|
| C. S. Edwards et al,.A 633 nm iodine-stabilized diode-laser frequency standard.Metrologia36.1999,3641-45. * |
| 赖薇等.光学检测法用于工业气体检测的研究.工业安全与环保33 5.2007,33(5),37-39. |
| 赖薇等.光学检测法用于工业气体检测的研究.工业安全与环保33 5.2007,33(5),37-39. * |
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| CN101271064A (en) | 2008-09-24 |
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Granted publication date: 20100602 Termination date: 20140513 |