CN203479700U - Fine-turning long path gas detection device - Google Patents
Fine-turning long path gas detection device Download PDFInfo
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- CN203479700U CN203479700U CN201320593667.8U CN201320593667U CN203479700U CN 203479700 U CN203479700 U CN 203479700U CN 201320593667 U CN201320593667 U CN 201320593667U CN 203479700 U CN203479700 U CN 203479700U
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- concave mirror
- fine adjustment
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Abstract
The utility model discloses a fine-turning long path gas detection device comprising a container having a sealed gas chamber therein, wherein a first concave mirror and a second concave mirror are relatively arranged in the gas chamber of the container; a fine-turning reflector is arranged on one side of the first concave mirror; on two sides of the first concave mirror, a parallel light emitter and a photoelectric sensor are arranged on the container; the parallel light emitter is close to the fine-turning reflector; and a light source emitting end of the parallel light emitter and a light receiving end of the photoelectric sensor stretch into the gas chamber. The gas detection device, through a way of reflecting for several times, reduces volume of the gas chamber and improves detection capacity of an instrument. The fine-turning reflector can change path of reflected light and reflect the light, thus prolonging an effective path and avoiding a standard distance effect simultaneously.
Description
Technical field
The utility model belongs to precision processing technology and optical technical field, is particularly a kind ofly applied to the tunable diode laser absorption spectroscopy based on TDLAS() etc. the long light path gas-detecting device of fine adjustment type of gas-phase spectrum analytical instrument.
Background technology
Along with the development of the industries such as China's Industry Control, Ferrous Metallurgy, petrochemical complex, environmental protection, biochemical pharmacy, electric power, Aero-Space, need further to strengthen the production run in these fields to carry out Monitoring and Controlling.This just has higher requirement to indexs such as the accuracy of detection of use procedure analyser in production run, response time, system stability.The on-line analysis of gaseous substance concentration be widely used in these industries production run monitoring, production technology optimization, fall dirty analyze, energy gas reclaims the aspects such as controls, environment monitoring, is the importance of raising to the analysis ability of production run.
TDLAS(Tunable Diode Laser Absorption Spectroscopy) be the abbreviation of tunable diode laser absorption spectroscopy technology, be conventionally called again tunable diode laser absorption spectroscopy technology.Compare with not light splitting of tradition infrared technique spectral technique, TDLAS technology has a lot of remarkable advantages:
(1) utilize the monochromaticity that semiconductor laser is good, " single line spectrum " technology of employing avoids background gas to absorb interference;
(2) utilize semiconductor laser wavelength tunability to solve dust, form pollution to the impact of measuring;
(3) without sampling pre-service, fast response time, is convenient to production run to control;
(4) in instrument internal measuring process, timing automatic is demarcated, without manual demarcation;
(5) can automatically revise environment temperature, pressure variation to the impact of measuring;
Therefore, the laser gas concentration analyzer based on TDLAS technology can meet preferably that spectrochemical analysis for gases and gas concentration analyze in the urgent need to.
Portable laser gas concentration analyzer based on TDLAS technology, the detection limit of instrument and the optical path length of inner plenum relation in direct ratio, the detection limit of the longer instrument of light path is lower, and instrument reaction is sensitiveer.But in the unreflecting situation of light path, the longer instrument gas cell of light path volume is larger, is often inconvenient to carry.
Utility model content
The utility model, for solving the problems of the technologies described above, provides little, the portable fine adjustment type of a kind of volume long light path gas-detecting device.
For achieving the above object, the long light path gas-detecting device of fine adjustment type of the present utility model, comprise that inside has the container of sealed gas chamber, in the air chamber of container, be provided with the first concave mirror and the second concave mirror that the surface of emission is oppositely arranged, the first concave mirror one side is provided with fine adjustment type catoptron, container is provided with directional light transmitter and the photoelectric sensor that is positioned at the first concave mirror both sides, directional light transmitter closes on fine adjustment type catoptron, and the light source transmitting terminal of directional light transmitter and the light receiving end of photoelectric sensor extend in air chamber.
Profile and the air chamber of described container are rectangular shape, the first concave mirror, the second concave mirror, fine adjustment type catoptron, directional light transmitter and photoelectric sensor are connected with container is gluing respectively, the air chamber that the first concave mirror and the second concave mirror are located at respectively container two ends along its length, the length of the second concave mirror is greater than the length of the first concave mirror.
Described directional light transmitter is collimating apparatus, and directional light transmitter is connected with optical fiber ring flange by optical fiber, and the signal output part of photoelectric sensor is connected with the signal receiving end of laser gas concentration analyzer by data line; In described air chamber, be full of tested gas, the incident light that optical fiber sends forms parallel beam after directional light transmitter, parallel beam is first irradiated on the second concave mirror, the second concave mirror reflexes to parallel beam on the first concave mirror, the first concave mirror reflexes to parallel beam on the second concave mirror, the second concave mirror reflexes to parallel beam on fine adjustment type catoptron, fine adjustment type catoptron reflexes to parallel beam on the second concave mirror again, and the second concave mirror finally reflexes to parallel beam the light receiving end of photoelectric sensor.
Adopt technique scheme, the utility model is used directional light transmitter (collimating apparatus) that the light of introducing by optical fiber is processed into parallel beam, and parallel beam projects on micro-adjusting mechanism (fine adjustment type catoptron) after by the first concave mirror in air chamber and the second concave mirror multiple reflections.Fine adjustment type catoptron is a very little level crossing, fine adjustment type catoptron can carry out 360 degree adjustment to its angle fixedly time, can change the incident angle of incident light and incident light is reflexed to the first concave mirror and second concave mirror at air chamber two ends after parallel beam adjustment.Parallel rays is through fine adjustment type reflector alignment angle and after the first concave mirror and the second concave mirror, on final directive photoelectric sensor, photoelectric sensor is transported to signal in laser gas concentration analyzer, and laser gas concentration analyzer can be analyzed tested gas concentration.
While using the utility model, only optical fiber ring flange need to be connected to spectrometric instrument light source, parallel beam is multiple reflections between the first concave mirror, the second concave mirror and micro-adjusting mechanism, final directive photoelectric sensor, photoelectric sensor is converted to electric signal by the light source through tested gas absorption, and exports to laser gas concentration analyzer and analyze.
Because optical fiber core diameter is very thin, only have 10um, after collimating apparatus is processed, laser facula also only has 100um left and right.Error slightly during machining, light is propagated time error along light path and just can be amplified at double, and light is finally difficult to be received by photoelectric sensor.Even if use very accurate lathe to process, be also difficult to meet the requirement of light path precise positioning.The utility model is owing to using fine adjustment type catoptron, in air chamber processing, exist error, the first concave mirror and the second concave mirror bondingly to have error, collimating apparatus is bonding exist error, photoelectric sensor to have error in the situation that, still can adjust light path, the received photoelectric sensor of light is normally received.
The utility model adopts the method for multiple reflections, has reduced the volume of air chamber, has improved the detectability of instrument.The utility model is used fine adjustment type catoptron, reflected light can be changed to path and again reflect back, and when increasing effective light path, can effectively avoid normal pitch effect.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the utility model parallel beam path schematic diagram.
Embodiment
As shown in Figure 1, the long light path gas-detecting device of fine adjustment type of the present utility model, comprise that inside has the container 2 of sealed gas chamber 1, in the air chamber 1 of container 2, be provided with the first concave mirror 3 and the second concave mirror 4 that the surface of emission is oppositely arranged, the first concave mirror 3 one sides are provided with fine adjustment type catoptron 5, container 2 is provided with directional light transmitter 6 and the photoelectric sensor 7 that is positioned at the first concave mirror 3 both sides, directional light transmitter 6 closes on fine adjustment type catoptron 5, and the light source transmitting terminal of directional light transmitter 6 and the light receiving end of photoelectric sensor 7 extend in air chamber 1.
The profile of container 2 and air chamber 1 are rectangular shape, the first concave mirror 3, the second concave mirror 4, fine adjustment type catoptron 5, directional light transmitter 6 and photoelectric sensor 7 are connected with container 2 is gluing respectively, the air chamber 1 that the first concave mirror 3 and the second concave mirror 4 are located at respectively container 2 two ends along its length, the length of the second concave mirror 4 is greater than the length of the first concave mirror 3.
Directional light transmitter 6 is collimating apparatus, and directional light transmitter 6 is connected with optical fiber ring flange 9 by optical fiber 8, and the signal output part of photoelectric sensor 7 is connected with the signal receiving end of laser gas concentration analyzer 11 by data line 10.
As shown in Figure 2, in air chamber 1, be full of tested gas, the incident light that optical fiber sends forms parallel beam after directional light transmitter 6, parallel beam is first irradiated on the second concave mirror 4, the second concave mirror 4 reflexes to parallel beam on the first concave mirror 3, the first concave mirror 3 reflexes to parallel beam on the second concave mirror 4, the second concave mirror 4 reflexes to parallel beam on fine adjustment type catoptron 5, fine adjustment type catoptron 5 reflexes to parallel beam on the second concave mirror 4 again, and the second concave mirror 4 finally reflexes to parallel beam the light receiving end of photoelectric sensor 7.
All parts in the middle of the utility model is existing mature technology, and concrete structure repeats no more.
Collimating apparatus outer end in the utility model is connected to outside gas cell by optical fiber, by interfaces such as FC, draws.The minute surface of the first concave mirror 3 and the second concave mirror 4 is comprised of low temperature shape-changing material, and surface gold-plating is to increase reflection potential.The first concave mirror 3 and the second concave mirror 4 are concave mirror, so that when light reflection, the light of dispersing are pooled to directional light again.By multiple reflections, so as the longer distance of light through the gas in air chamber 1.Fine adjustment type catoptron 5 can reflection ray by a slice narrow flat thin slice form, the general surface gold-plating of this thin slice is to strengthen reflection potential.Photoelectric sensor 7 includes but not limited to relation by marriage gallium arsenic (ingaas), gallium phosphide (GaP), silicon (Si) and germanium (Ge) photodiode.Directional light transmitter 6 is collimating apparatus, certainly also comprises that other can be converted to parasitic light the device of directional light in the future.
Because optical fiber core diameter is very thin, only have 10um, after collimating apparatus is processed, laser facula also only has 100um left and right.Error slightly during machining, light is propagated time error along light path and just can be amplified at double, and light is finally difficult to be received by photoelectric sensor 7.Even if use very accurate lathe to process, be also difficult to meet the requirement of light path precise positioning.The utility model is owing to using fine adjustment type catoptron 5, in air chamber 1 processing, exist error, the first concave mirror 3 and the second concave mirror 4 bondingly to have error, collimating apparatus is bonding exist error, photoelectric sensor 7 to have error in the situation that, still can adjust light path, the received photoelectric sensor 7 of light is normally received.
Claims (3)
1. the long light path gas-detecting device of fine adjustment type, it is characterized in that: comprise that inside has the container of sealed gas chamber, in the air chamber of container, be provided with the first concave mirror and the second concave mirror that the surface of emission is oppositely arranged, the first concave mirror one side is provided with fine adjustment type catoptron that can 360 ° of rotations, container is provided with directional light transmitter and the photoelectric sensor that is positioned at the first concave mirror both sides, directional light transmitter closes on fine adjustment type catoptron, and the light source transmitting terminal of directional light transmitter and the light receiving end of photoelectric sensor extend in air chamber.
2. the long light path gas-detecting device of fine adjustment type according to claim 1, it is characterized in that: profile and the air chamber of described container are rectangular shape, the first concave mirror, the second concave mirror, fine adjustment type catoptron, directional light transmitter and photoelectric sensor are connected with container is gluing respectively, the air chamber that the first concave mirror and the second concave mirror are located at respectively container two ends along its length, the length of the second concave mirror is greater than the length of the first concave mirror.
3. the long light path gas-detecting device of fine adjustment type according to claim 1 and 2, it is characterized in that: described directional light transmitter is collimating apparatus, directional light transmitter is connected with optical fiber ring flange by optical fiber, and the signal output part of photoelectric sensor is connected with the signal receiving end of laser gas concentration analyzer by data line; In described air chamber, be full of tested gas, the incident light that optical fiber sends forms parallel beam after directional light transmitter, parallel beam is first irradiated on the second concave mirror, the second concave mirror reflexes to parallel beam on the first concave mirror, the first concave mirror reflexes to parallel beam on the second concave mirror, the second concave mirror reflexes to parallel beam on fine adjustment type catoptron, fine adjustment type catoptron reflexes to parallel beam on the second concave mirror again, and the second concave mirror finally reflexes to parallel beam the light receiving end of photoelectric sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320593667.8U CN203479700U (en) | 2013-09-25 | 2013-09-25 | Fine-turning long path gas detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320593667.8U CN203479700U (en) | 2013-09-25 | 2013-09-25 | Fine-turning long path gas detection device |
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| Publication Number | Publication Date |
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| CN203479700U true CN203479700U (en) | 2014-03-12 |
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| CN201320593667.8U Withdrawn - After Issue CN203479700U (en) | 2013-09-25 | 2013-09-25 | Fine-turning long path gas detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487401A (en) * | 2013-09-25 | 2014-01-01 | 河南省日立信股份有限公司 | Long-optical-path gas detection device with fine adjustment mechanism |
| CN107884353A (en) * | 2017-12-25 | 2018-04-06 | 苏州汉策能源设备有限公司 | A kind of gas absorption cell light channel structure suitable for fume continuous monitoring system |
| CN109709044A (en) * | 2018-12-29 | 2019-05-03 | 深圳供电局有限公司 | Assemble method, optics cavity and the optical gas absorbance pond of optics cavity |
| CN113155769A (en) * | 2021-03-18 | 2021-07-23 | 重庆科技学院 | Tunable spectrum-based variable optical path gas chamber component detection system and method |
-
2013
- 2013-09-25 CN CN201320593667.8U patent/CN203479700U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487401A (en) * | 2013-09-25 | 2014-01-01 | 河南省日立信股份有限公司 | Long-optical-path gas detection device with fine adjustment mechanism |
| CN103487401B (en) * | 2013-09-25 | 2016-03-23 | 河南省日立信股份有限公司 | With the long light path gas-detecting device of micro-adjusting mechanism |
| CN107884353A (en) * | 2017-12-25 | 2018-04-06 | 苏州汉策能源设备有限公司 | A kind of gas absorption cell light channel structure suitable for fume continuous monitoring system |
| CN109709044A (en) * | 2018-12-29 | 2019-05-03 | 深圳供电局有限公司 | Assemble method, optics cavity and the optical gas absorbance pond of optics cavity |
| CN113155769A (en) * | 2021-03-18 | 2021-07-23 | 重庆科技学院 | Tunable spectrum-based variable optical path gas chamber component detection system and method |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20160323 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20160323 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |