CN212207099U - Gas detection equipment based on laser absorption spectrum - Google Patents
Gas detection equipment based on laser absorption spectrum Download PDFInfo
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- CN212207099U CN212207099U CN202020800224.1U CN202020800224U CN212207099U CN 212207099 U CN212207099 U CN 212207099U CN 202020800224 U CN202020800224 U CN 202020800224U CN 212207099 U CN212207099 U CN 212207099U
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Abstract
The utility model relates to the technical field of component detection of exhaust gas in industrial process and environmental protection, in particular to a gas detection device based on laser absorption spectrum, which comprises a gas detection device main body, wherein a gas detection chamber is arranged on the upside of the base surface of a gas detection platform, a near infrared semiconductor laser is arranged on the left side inside the gas detection chamber, a long optical path light pool is arranged in the middle inside the gas detection chamber, an indium gallium arsenic infrared detector is arranged on the right side inside the gas detection chamber, a gas analysis control panel is arranged on the upside of a supporting upright post, a signal generator is arranged on the front side of the gas detection device main body and on the left upper side of the gas detection chamber, the optical path range of the long optical path light pool is 5-200 m, the low-concentration hydrogen sulfide measurement can be realized, and the measurement resolution and sensitivity are improved, by adopting a comparison calibration method, only the hydrogen sulfide gas standard substance is used, and the hydrogen sulfide and the carbon dioxide can be calibrated.
Description
Technical Field
The utility model relates to an industrial process and environmental protection tail exhaust gas composition detection technical field specifically are a gaseous check out test set based on laser absorption spectrum.
Background
The gas detection technology based on the laser absorption spectrum has the excellent characteristics of high response speed, non-contact measurement with gas, no interference from other background gases, extremely low detection lower limit and the like, and is widely applied to gas component detection in the industrial process and tail gas emission monitoring in environmental protection.
The hydrogen sulfide gas detection technology of the current laser absorption spectrum mainly adopts a hydrogen sulfide absorption peak with a wavelength of 1578nm at a near-infrared waveband, and the absorption peak has high absorption intensity and is not subjected to cross interference of methane gas, so that the hydrogen sulfide gas detection technology is widely applied to hydrogen sulfide detection in the natural gas industry. However, near the wavelength of 1578nm, the distance between the absorption peak of carbon dioxide at 1578.2nm and the absorption peak of hydrogen sulfide at 1578.1nm is only 0.1nm, the absorption peak areas are partially overlapped, and obvious gas cross interference exists. While the ratio of the absorption strength of 3000ppm of carbon dioxide to the absorption strength of 100ppm of hydrogen sulfide is 1: 1.1, corrective compensation cannot be achieved. Therefore, in the process gas detection, especially when carbon dioxide is present in a percentage concentration in the background gas, hydrogen sulfide cannot be measured due to too much cross interference, and therefore a gas detection device based on laser absorption spectroscopy is needed to improve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gaseous check out test set based on laser absorption spectrum to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a gas detection device based on laser absorption spectrum comprises a gas detection device main body, a power supply box is arranged on the left lower side of the front surface of the gas detection device main body, the right lower side of the front of the gas detection equipment main body is provided with an equipment cabinet, the back of the upper side of the front of the gas detection equipment main body is provided with a gas detection table, a gas detection chamber is arranged on the upper side of the base surface of the gas detection platform, a near-infrared semiconductor laser is arranged on the left side inside the gas detection chamber, a long-optical-path light pool is arranged in the middle of the inside of the gas detection chamber, an indium gallium arsenic infrared detector is arranged on the right side of the inside of the gas detection chamber, a supporting upright post is arranged on the left side of the base surface of the gas detection device, a gas analysis control panel is arranged on the upper side of the supporting upright post, and a signal generator is arranged on the front surface of the gas detection equipment main body and positioned on the left upper side of the gas detection chamber.
Preferably, the front surface of the gas detection chamber is provided with a glass observation window.
Preferably, the near-infrared semiconductor laser is a tunable semiconductor laser having an output center wavelength of about 1925.1nm, and a DFB principle laser is used.
Preferably, the gas analysis control panel is provided with a laser driving circuit board module and a signal processing circuit board module, the gas analysis control panel is electrically connected with the near-infrared semiconductor laser, the indium gallium arsenic infrared detector and the signal generator, and the gas analysis control panel utilizes calibration data of hydrogen sulfide gas.
Preferably, the signal generator is connected with the near-infrared semiconductor laser through a laser driving circuit board module.
Preferably, the optical path range of the long-optical-path optical cell is 5-200 meters.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses in, the optical distance scope through the long optical distance light pond that sets up is at 5 ~ 200 meters, can realize that low concentration hydrogen sulfide measures, has improved measurement resolution and sensitivity, compares the calibration method through the adoption, only uses hydrogen sulfide gas body standard substance, can mark hydrogen sulfide and carbon dioxide.
Drawings
FIG. 1 is a side view of the main viewing axis of the present invention;
FIG. 2 is a side structure view of the main viewing axis of the whole device of the present invention;
FIG. 3 is a view of the overall structure of the present invention;
FIG. 4 is a schematic diagram of the 1578nm absorption peak of hydrogen sulfide of the present invention;
FIG. 5 is a schematic diagram of the absorption peak of 1925.1nm hydrogen sulfide of the present invention.
In the figure: the gas detection device comprises a gas detection device main body, a 2-power supply box, a 3-device cabinet, a 4-gas detection table, a 5-gas detection chamber, a 6-near infrared semiconductor laser, a 7-long optical path light cell, an 8-indium gallium arsenic infrared detector, a 9-supporting upright column, a 10-gas analysis control panel and a 11-signal generator.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution:
a gas detection device based on laser absorption spectroscopy comprises a gas detection device main body 1, and is characterized in that: a power supply box 2 is arranged on the left lower side of the front of a gas detection equipment main body 1, an equipment cabinet 3 is arranged on the right lower side of the front of the gas detection equipment main body 1, a gas detection table 4 is arranged on the back of the upper side of the front of the gas detection equipment main body 1, a gas detection chamber 5 is arranged on the upper side of the basal plane of the gas detection table 4, a near-infrared semiconductor laser 6 is arranged on the left side of the inside of the gas detection chamber 5, a long-optical-path optical cell 7 is arranged in the middle of the inside of the gas detection chamber 5, an indium gallium arsenic infrared detector 8 is arranged on the right side of the inside of the gas detection chamber 5, a support upright column 9 is arranged on the left side of the basal plane of the gas detection chamber 4, a gas analysis control panel 10 is arranged on the upper side of the support upright column 9, a signal generator 11 is arranged on the left, the method can realize the measurement of low-concentration hydrogen sulfide, improves the measurement resolution and sensitivity, and can calibrate the hydrogen sulfide and the carbon dioxide by adopting a comparison calibration method and only using a hydrogen sulfide gas standard substance.
The utility model discloses work flow: when in use, the gas detection chamber 5 adopts the principle of Tunable Diode Laser Absorption Spectroscopy (TDLAS for short) for a measurement unit, the Lambert beer law is followed, the selective Absorption characteristic of gas molecules to Laser with specific wavelength is utilized, the change of the Laser Absorption light intensity is analyzed to obtain the concentration of gas, the Tunable semiconductor Laser with the output central wavelength of about 1925.1nm is adopted by the near-infrared semiconductor Laser 6, 1925.1nm hydrogen sulfide Absorption peak and 1924.6nm carbon dioxide Absorption peak signals can be measured, 1925.1nm hydrogen sulfide Absorption peak is selected, the carbon dioxide interference is effectively avoided, the set signal generator 11 generates modulation signals and scanning signals, the Laser driving circuit board module arranged on the gas analysis control panel 10 drives the near-infrared semiconductor Laser 6 to output modulated and scanned light signals, the optical signal output range is 1924.5nm-1925.5nm, the optical signal output range can completely cover a 1925.1nm hydrogen sulfide absorption peak and a 1924.6nm carbon dioxide absorption peak, after an indium gallium arsenic infrared detector 8 detects that the optical signal changes after passing through a long-optical-path optical cell 7, the optical signal changes after gas absorption, a signal processing module carries out filtering and phase-locked amplification processing on the signal, zero values and peak values of a 1925.1nm hydrogen sulfide absorption peak 11 and a 1924.6nm carbon dioxide absorption peak 10 are respectively scanned and sampled, a signal processing circuit board module arranged on a gas analysis control panel 10 board carries out filtering and phase-locked amplification processing on the signal, zero values and peak values of an 1925.1nm hydrogen sulfide absorption peak and a 1924.6nm carbon dioxide absorption peak are respectively scanned and sampled simultaneously in a scanning period, test results of hydrogen sulfide and carbon dioxide are obtained by calculation, when the concentration of the carbon dioxide is very high, the ratio of the absorption intensity of the hydrogen sulfide and the carbon dioxide is used by the, calculating the interference intensity of the carbon dioxide, compensating the measured value result of the hydrogen sulfide in real time according to the result, calculating the test result of the hydrogen sulfide and the carbon dioxide by the gas analysis control panel 10, calculating the interference intensity of the carbon dioxide by using the ratio relationship of the absorption peak size of 1925.1nm hydrogen sulfide and the absorption peak size of 1924.6nm carbon dioxide, compensating the measured value result of the hydrogen sulfide in real time according to the result, and calculating the concentration-signal calibration value of the carbon dioxide absorption signal of 1924.6nm by the gas analysis control panel 10 by using the calibration data of the hydrogen sulfide gas and simultaneously using the ratio of the absorption intensities of the hydrogen sulfide and the carbon dioxide.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A gas detection apparatus based on laser absorption spectroscopy, comprising a gas detection apparatus body (1), characterized in that: the gas detection device comprises a gas detection device body (1), a power supply box (2) is arranged on the lower left side of the front of the gas detection device body (1), a device cabinet (3) is arranged on the lower right side of the front of the gas detection device body (1), a gas detection table (4) is arranged on the back of the upper side of the front of the gas detection device body (1), a gas detection chamber (5) is arranged on the upper side of the basal plane of the gas detection table (4), a near-infrared semiconductor laser (6) is arranged on the left side of the inside of the gas detection chamber (5), a long-optical-path optical cell (7) is arranged in the middle of the inside of the gas detection chamber (5), an indium gallium arsenic infrared detector (8) is arranged on the right side of the inside of the gas detection chamber (5), a support column (9) is arranged on the left side of the basal, a signal generator (11) is arranged on the front face of the gas detection device main body (1) and positioned on the left upper side of the gas detection chamber (5).
2. The gas detection apparatus based on laser absorption spectroscopy as claimed in claim 1, wherein: the front surface of the gas detection chamber (5) is provided with a glass observation window.
3. The gas detection apparatus based on laser absorption spectroscopy as claimed in claim 1, wherein: the near-infrared semiconductor laser (6) adopts a tunable semiconductor laser with the output center wavelength of about 1925.1nm and uses a DFB principle laser.
4. The gas detection apparatus based on laser absorption spectroscopy as claimed in claim 1, wherein: the gas analysis control panel (10) is provided with a laser driving circuit board module and a signal processing circuit board module, the gas analysis control panel (10) is electrically connected with the near-infrared semiconductor laser (6), the indium gallium arsenic infrared detector (8) and the signal generator (11), and the gas analysis control panel (10) utilizes calibration data of hydrogen sulfide gas.
5. The gas detection apparatus based on laser absorption spectroscopy as claimed in claim 1, wherein: and the signal generator (11) is connected with the near-infrared semiconductor laser (6) through a laser driving circuit board module.
6. The gas detection apparatus based on laser absorption spectroscopy as claimed in claim 1, wherein: the optical path range of the long-optical-path optical cell (7) is 5-200 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020800224.1U CN212207099U (en) | 2020-05-14 | 2020-05-14 | Gas detection equipment based on laser absorption spectrum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020800224.1U CN212207099U (en) | 2020-05-14 | 2020-05-14 | Gas detection equipment based on laser absorption spectrum |
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| CN212207099U true CN212207099U (en) | 2020-12-22 |
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| CN202020800224.1U Active CN212207099U (en) | 2020-05-14 | 2020-05-14 | Gas detection equipment based on laser absorption spectrum |
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