CN115993347B - Gas detection device and method - Google Patents
Gas detection device and method Download PDFInfo
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- CN115993347B CN115993347B CN202310272059.5A CN202310272059A CN115993347B CN 115993347 B CN115993347 B CN 115993347B CN 202310272059 A CN202310272059 A CN 202310272059A CN 115993347 B CN115993347 B CN 115993347B
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- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 180
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims description 15
- 238000000295 emission spectrum Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 272
- 230000003287 optical effect Effects 0.000 description 29
- 239000005431 greenhouse gas Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 229910018503 SF6 Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001285 laser absorption spectroscopy Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The utility model relates to a gas detection device and method relates to gas detection technical field, and this gas detection device includes first laser instrument, second laser instrument, absorption air chamber, vacuum air chamber, detector and control unit, control unit for control first laser instrument is to absorption air chamber transmission first laser, and control second laser instrument is to vacuum air chamber transmission second laser, the detector is used for converting the first laser after the transmission through absorption air chamber into first electrical signal, and converts the second laser after the transmission through vacuum air chamber into the second electrical signal, control unit still is used for according to first electrical signal and second electrical signal, confirm the gas concentration of gas to be measured. The method and the device determine the gas concentration by combining the first electric signal and the second electric signal, so that in the process of determining the gas concentration according to the absorption peak of the gas to be detected, the influence of non-absorption loss on determining the gas concentration is reduced by introducing the preset calibration peak, and the accuracy of detecting the gas concentration is improved.
Description
Technical Field
The present disclosure relates to the field of gas detection technology, and in particular, to a gas detection apparatus and method.
Background
In recent years, along with the continuous acceleration of global industrialization, the emission of greenhouse gases in the atmosphere is continuously increased due to the production activities of human beings, and the method has obvious influence on various aspects of global climate, ecology, economy and the like. In order to regulate and control the emission of greenhouse gases and achieve the aims of carbon peak reaching and carbon neutralization, the gas concentrations of the greenhouse gases in different areas need to be detected so as to know the carbon emission and emission reduction effect of the areas.
Currently, TDLAS (english: tuanbleDiode Laser Absorption Spectroscopy, chinese: tunable semiconductor laser absorption spectroscopy) technology is mainly used to detect the gas concentration of greenhouse gases. However, in the process of detecting the gas concentration of greenhouse gases using the TDLAS technique, the gas concentration is detected with low accuracy due to the influence of non-absorption loss such as environmental vibration, mechanical movement of the optical fiber, and scattering loss of dust to light.
Disclosure of Invention
An object of the present disclosure is to provide a gas detection apparatus and method for solving the problem of low accuracy in detecting a gas concentration.
According to a first aspect of embodiments of the present disclosure, there is provided a gas detection apparatus including a first laser, a second laser, an absorption gas cell, a vacuum gas cell, a detector, and a control unit; the first laser, the second laser and the detector are respectively connected with the control unit; the absorption air chamber contains gas to be detected;
The control unit is used for controlling the first laser to emit first laser to the absorption air chamber according to a preset first scanning modulation signal so as to enable the first laser to transmit through the absorption air chamber; the gas to be detected has an absorption peak in a scanning range of the wavelength emitted by the first laser;
the control unit is further used for controlling the second laser to emit second laser to the vacuum air chamber according to a preset second scanning modulation signal so as to enable the second laser to transmit through the vacuum air chamber; the second laser is laser with an emission spectrum having a preset calibration peak according to the second scanning modulation signal; the preset calibration peak and the absorption peak are not overlapped;
the detector is used for converting the first laser transmitted through the absorption air chamber into a first electric signal and converting the second laser transmitted through the vacuum air chamber into a second electric signal;
the control unit is further configured to determine a gas concentration of the gas to be measured according to the first electrical signal and the second electrical signal.
Optionally, the control unit is configured to:
Extracting an actual measurement absorption peak of the gas to be detected according to the first electric signal, and extracting an actual measurement calibration peak of the second laser according to the second electric signal;
and determining the gas concentration according to the measured absorption peak and the measured calibration peak.
Optionally, the gas detection device further comprises a first beam splitter and a second beam splitter, wherein the first beam splitter is arranged on a transmission light path of the first laser, and the second beam splitter is arranged on a transmission light path of the second laser;
the first beam splitter is configured to split the first laser into a first signal laser and a first reference laser, and transmit the first signal laser through the absorption air chamber, so that the first reference laser is directly received by the detector;
the second beam splitter is configured to split the second laser into a second signal laser and a second reference laser, and transmit the second signal laser through the vacuum chamber, so that the second reference laser is directly received by the detector;
the detector is further used for converting the first signal laser transmitted through the absorption air chamber into a third electric signal, converting the first reference laser into a fourth electric signal, converting the second signal laser transmitted through the vacuum air chamber into a fifth electric signal and converting the second reference laser into a sixth electric signal;
The control unit is used for determining the gas concentration according to the third electric signal, the fourth electric signal, the fifth electric signal and the sixth electric signal.
Optionally, the control unit is configured to:
determining an actual measurement absorption peak of the gas to be measured according to the third electric signal and the fourth electric signal, and determining an actual measurement calibration peak of the second laser according to the fifth electric signal and the sixth electric signal;
and determining the gas concentration according to the measured absorption peak and the measured calibration peak.
Optionally, the control unit is configured to:
determining a target ratio of the intensity of the preset calibration peak to the intensity of the actually measured calibration peak;
determining a target preset corresponding relation from a plurality of first preset corresponding relations according to the target ratio; the first preset corresponding relation is a corresponding relation between the strength of the actually measured absorption peak and the gas concentration, and each first preset corresponding relation corresponds to a specific value;
and determining the gas concentration according to the strength of the actually measured absorption peak and the target preset corresponding relation.
Optionally, the gas detection device further comprises a vacuum pump connected with the absorption gas chamber; the vacuum pump is connected with the control unit;
The control unit is further used for controlling the vacuum pump to pump the gas in the absorption air chamber to the outside before controlling the first laser to emit the first laser, and controlling the first laser to emit third laser with preset intensity to the absorption air chamber so that the third laser is transmitted through the absorption air chamber;
the control unit is further used for controlling the second laser to emit fourth laser with the preset intensity to the vacuum air chamber before controlling the second laser to emit the second laser so as to enable the fourth laser to transmit through the vacuum air chamber;
the detector is also used for converting the third laser light transmitted through the absorption air chamber into a seventh electric signal and converting the fourth laser light transmitted through the vacuum air chamber into an eighth electric signal;
the control unit is further configured to calibrate the gas concentration according to the seventh electrical signal, the eighth electrical signal, and the preset intensity, to obtain a calibrated gas concentration.
Optionally, the control unit is configured to:
determining a first compensation coefficient according to the seventh electric signal, the eighth electric signal and the preset intensity;
And calibrating the gas concentration according to the first compensation coefficient to obtain the calibrated gas concentration.
Optionally, the control unit is configured to:
determining the first laser intensity of the third laser transmitted through the absorption air chamber according to the seventh electric signal, and determining the second laser intensity of the fourth laser transmitted through the vacuum air chamber according to the eighth electric signal;
taking the difference between the first laser intensity and the preset intensity as a first laser difference and taking the difference between the second laser intensity and the preset intensity as a second laser difference;
determining a first compensation coefficient according to the first laser difference and the second laser difference by using a preset second corresponding relation; the second correspondence is a correspondence between the first laser difference, the second laser difference, and the first compensation coefficient.
Optionally, the control unit is configured to:
acquiring first service time information of the absorption air chamber and second service time information of the vacuum air chamber;
determining a second compensation coefficient according to the first usage time information and the second usage time information by using a preset third corresponding relation; the third corresponding relation is a corresponding relation among the first using time information, the second using time information and the second compensation coefficient;
And calibrating the gas concentration according to the second compensation coefficient to obtain the calibrated gas concentration.
According to a second aspect of embodiments of the present disclosure, there is provided a gas detection method applied to the gas detection apparatus of any one of the first aspects, the method including:
according to a preset first scanning modulation signal, a first laser is controlled to emit first laser to an absorption air chamber so that the first laser is transmitted through the absorption air chamber; the gas to be detected has an absorption peak in a scanning range of the wavelength emitted by the first laser;
according to a preset second scanning modulation signal, a second laser is controlled to emit second laser to a vacuum air chamber so that the second laser is transmitted through the vacuum air chamber; the second laser is laser with an emission spectrum having a preset calibration peak according to the second scanning modulation signal; the preset calibration peak and the absorption peak are not overlapped;
determining the gas concentration of the gas to be detected according to the first electric signal and the second electric signal; the first electric signal is obtained by the detector according to the first laser after the transmission through the absorption air chamber, and the second electric signal is obtained by the detector according to the second laser after the transmission through the vacuum air chamber.
Through the above technical scheme, the gas detection device provided by the embodiment of the disclosure includes: the device comprises a first laser, a second laser, an absorption air chamber, a vacuum air chamber, a detector and a control unit, wherein the control unit is used for controlling the first laser to emit first laser to the absorption air chamber according to a first scanning modulation signal, the control unit is also used for controlling the second laser to emit second laser to the vacuum air chamber according to a second scanning modulation signal, the second laser is laser with a preset calibration peak according to the second scanning modulation signal, the generated emission spectrum of the second laser is provided with the detector, the detector is used for converting the first laser transmitted through the absorption air chamber into a first electric signal and converting the second laser transmitted through the vacuum air chamber into a second electric signal, and the control unit is also used for determining the gas concentration of gas to be detected according to the first electric signal and the second electric signal. The gas detection device in the disclosure determines the gas concentration of the gas to be detected by combining the first electric signal converted by the first laser after being transmitted through the absorption gas chamber and the second electric signal converted by the second laser after being transmitted through the vacuum gas chamber, so that in the process of determining the gas concentration according to the absorption peak of the gas to be detected, the preset calibration peak of the second laser is introduced to reduce the influence of non-absorption loss on determining the gas concentration, thereby improving the accuracy of detecting the gas concentration.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic view showing a structure of a gas detection apparatus according to an exemplary embodiment;
FIG. 2 is a schematic view of another gas detection device according to FIG. 1;
FIG. 3 is a schematic view of a structure of another gas detecting apparatus according to the embodiment shown in FIG. 1;
FIG. 4 is a flow chart illustrating a method of gas detection according to an exemplary embodiment;
FIG. 5 is a flow chart according to one of the steps 203 shown in FIG. 4;
FIG. 6 is a flow chart illustrating another gas detection method according to an exemplary embodiment;
FIG. 7 is a flow chart illustrating another gas detection method according to an exemplary embodiment;
FIG. 8 is a flow chart according to one of the steps 206 shown in FIG. 7;
fig. 9 is a flow chart illustrating yet another gas detection method according to an exemplary embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a schematic diagram showing a structure of a gas detection apparatus according to an exemplary embodiment. As shown in fig. 1 (black arrow in fig. 1 is a transmission optical path of laser light), the gas detection apparatus 10 includes a first laser 11, a second laser 12, an absorption gas cell 13, a vacuum gas cell 14, a detector 15, and a control unit 16. The first laser 11, the second laser 12 and the detector 15 are respectively connected with a control unit 16, and the absorption gas chamber 13 accommodates a gas to be measured.
The control unit 16 is configured to control the first laser 11 to emit the first laser light to the absorption air chamber 13 according to a preset first scanning modulation signal, so that the first laser light is transmitted through the absorption air chamber 13. The gas to be measured has an absorption peak in the scanning range of the wavelength emitted by the first laser 11.
The control unit 16 is further configured to control the second laser 12 to emit a second laser light to the vacuum chamber 14 according to a preset second scan modulation signal, so that the second laser light is transmitted through the vacuum chamber 14. The second laser is a laser whose emission spectrum generated by the second laser 12 according to the second scan modulation signal has a preset calibration peak, and the preset calibration peak and the absorption peak do not overlap.
A detector 15 for converting the first laser light transmitted through the absorption cell 13 into a first electrical signal and converting the second laser light transmitted through the vacuum cell 14 into a second electrical signal.
The control unit 16 is further configured to determine a gas concentration of the gas to be measured according to the first electrical signal and the second electrical signal.
For example, the TDLAS technology is adopted to detect the gas concentration of the gas to be detected, and the central wavelength of the laser light source is firstly adjusted to be within the wavelength range of the absorption peak of the gas to be detected, and then the laser light source is controlled to emit laser to the gas to be detected. And then detecting laser transmitted through the gas to be detected through a detector to obtain an absorption peak of the gas to be detected on the laser, and determining the gas concentration of the gas to be detected according to the absorption peak. However, in actual cases, there are often non-absorption losses such as environmental vibrations, mechanical movements of the optical fiber, and scattering losses of dust to light, which directly affect the accuracy of determining the gas concentration from the absorption peak. In order to inhibit the influence of non-absorption loss on the accuracy of determining the gas concentration, a calibration light path for measuring the non-absorption loss can be independently arranged on the basis of the existing measurement light path for measuring the absorption peak of the gas to be detected, and the gas concentration is determined by combining the measured non-absorption loss when the gas concentration is determined according to the absorption peak of the gas to be detected, so that the influence of the non-absorption loss on the determination of the gas concentration is reduced, and the accuracy of detecting the gas concentration is improved.
Specifically, first, the gas detection device 10 composed of the first laser 11, the second laser 12, the absorption cell 13 (the absorption cell 13 is disposed on the transmission path of the laser light emitted from the first laser 11), the vacuum cell 14 (the vacuum cell 14 is disposed on the transmission path of the laser light emitted from the second laser 12), the detector 15, and the control unit 16 may be constructed. The gas detection device 10 includes two optical paths, a measurement optical path and a calibration optical path. The measuring light path consists of a first laser 11, an absorption air chamber 13 and a detector 15, and the calibration light path consists of a second laser 12, a vacuum air chamber 14 and the detector 15. The absorption air chamber 13 may be an open chamber or a closed chamber. Further, in order to ensure accuracy of detecting the gas concentration, the measuring light path and the calibration light path need to be in the same environment, the first laser 11 and the second laser 12 need to be of the same brand and the same model, and the sizes, shapes and materials of the absorption gas chamber 13 and the vacuum gas chamber 14 need to be kept consistent.
When the gas concentration of the gas to be measured needs to be detected, the user may introduce the gas to be measured into the absorption gas chamber 13 and send a detection instruction to the control unit 16. After receiving the detection instruction, the control unit 16 may send a preset first scanning modulation signal to the first laser 11, so as to scan and modulate the wavelength emitted by the first laser 11, so that the first laser 11 emits the first laser light to the absorption air chamber 13. The first scan modulation signal may be a low frequency signal, or may be a low frequency signal superimposed with a high frequency signal, where the low frequency signal may be a sawtooth wave, a triangular wave, or a trapezoidal wave, and the high frequency signal may be a high frequency sine/cosine wave signal. In addition, the first scanning modulation signal is set to ensure that the gas to be measured has an absorption peak in the scanning range of the wavelength emitted by the first laser 11.
The control unit 16 may send a preset second scan modulation signal to the second laser 12 while sending the first scan modulation signal, so as to scan and modulate the wavelength emitted by the second laser 12, so that the second laser 12 emits the second laser light to the vacuum chamber 14. The second laser is a laser having a preset calibration peak in an emission spectrum generated by the second laser 12 according to the second scan modulation signal, and the preset calibration peak and the absorption peak do not overlap. The predetermined calibration peak may be understood as an absorption peak artificially generated in the emission spectrum of the second laser 12 (i.e., artificially generating a depression in the emission spectrum) by using the second scan modulation signal without going through the absorption of the gas to be measured. In addition, the first laser 11 and the second laser 12 may be any type of tunable laser, such as a distributed feedback (Distributed Feedback) semiconductor laser, and the first laser 11 and the second laser 12 may be the same laser, such as a two-way laser.
The first laser light is emitted from the first laser 11, then is transmitted into the absorption gas chamber 13 (the gas to be detected in the absorption gas chamber 13 absorbs photons with a specific frequency in the first laser light), and is received by the detector 15 after being transmitted through the absorption gas chamber 13. The second laser light, after being emitted from the second laser 12, is first transmitted into the vacuum chamber 14 and received by the detector 15 after being transmitted through the vacuum chamber 14. The detector 15 may convert the first laser light transmitted through the absorption cell 13 into a first electrical signal, convert the second laser light transmitted through the vacuum cell 14 into a second electrical signal, and transmit the first and second electrical signals to the control unit 16. After receiving the first electrical signal and the second electrical signal, the control unit 16 may extract an actual measurement absorption peak of the gas to be measured (i.e., an actually measured absorption peak of the gas to be measured for the first laser) according to the first electrical signal, and extract an actual measurement calibration peak of the gas to be measured according to the second electrical signal. The actually measured calibration peak can be understood as an absorption peak generated by artificial simulation actually measured, and due to the existence of non-absorption loss, the actually measured calibration peak can be different from a preset calibration peak, and the non-absorption loss can be measured by utilizing the difference. Then, the gas concentration of the gas to be measured can be determined from the measured absorption peak and the measured calibration peak. For example, the control unit 16 may determine the candidate concentration of the gas to be measured according to the measured absorption peak through a preset first correspondence, calculate an intensity difference between the intensity of the preset calibration peak and the intensity of the measured calibration peak, determine the corrected concentration of the gas to be measured according to the fourth preset correspondence according to the intensity difference, and use the difference between the candidate concentration and the corrected concentration as the gas concentration of the gas to be measured. The first preset corresponding relation is the corresponding relation between the strength of the actually measured absorption peak and the gas concentration, and the fourth preset corresponding relation is the corresponding relation between the strength difference and the corrected concentration.
The gas to be measured may be carbon dioxide (CO 2 ) Methane (CH) 4 ) Nitrous oxide (N) 2 O), sulfur hexafluoride (SF) 6 ) Hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and water (H) 2 O) isothermal chamber gases, but may be any other type of gas, and this disclosure is not limited in detail.
In summary, the gas detection device provided in the embodiment of the disclosure includes: the device comprises a first laser, a second laser, an absorption air chamber, a vacuum air chamber, a detector and a control unit, wherein the control unit is used for controlling the first laser to emit first laser to the absorption air chamber according to a first scanning modulation signal, the control unit is also used for controlling the second laser to emit second laser to the vacuum air chamber according to a second scanning modulation signal, the second laser is laser with a preset calibration peak according to the second scanning modulation signal, the generated emission spectrum of the second laser is provided with the detector, the detector is used for converting the first laser transmitted through the absorption air chamber into a first electric signal and converting the second laser transmitted through the vacuum air chamber into a second electric signal, and the control unit is also used for determining the gas concentration of gas to be detected according to the first electric signal and the second electric signal. The gas detection device in the disclosure determines the gas concentration of the gas to be detected by combining the first electric signal converted by the first laser after being transmitted through the absorption gas chamber and the second electric signal converted by the second laser after being transmitted through the vacuum gas chamber, so that in the process of determining the gas concentration according to the absorption peak of the gas to be detected, the preset calibration peak of the second laser is introduced to reduce the influence of non-absorption loss on determining the gas concentration, thereby improving the accuracy of detecting the gas concentration.
Fig. 2 is a schematic view of a structure of another gas detecting apparatus according to fig. 1. As shown in fig. 2, the gas detection device 10 further includes a first beam splitter 17 and a second beam splitter 18, the first beam splitter 17 being disposed on a transmission optical path of the first laser light, and the second beam splitter 18 being disposed on a transmission optical path of the second laser light.
A first beam splitter 17 for splitting the first laser light into a first signal laser light and a first reference laser light, and transmitting the first signal laser light through the absorption cell 13, so that the first reference laser light is directly received by the detector 15.
A second beam splitter 18 for splitting the second laser light into a second signal laser light and a second reference laser light, and transmitting the second signal laser light through the vacuum chamber 14, so that the second reference laser light is directly received by the detector 15.
The detector 15 is further configured to convert the first signal laser light transmitted through the absorption air chamber 13 into a third electrical signal, convert the first reference laser light into a fourth electrical signal, convert the second signal laser light transmitted through the vacuum air chamber 14 into a fifth electrical signal, and convert the second reference laser light into a sixth electrical signal.
A control unit 16 for determining the gas concentration based on the third electrical signal, the fourth electrical signal, the fifth electrical signal and the sixth electrical signal.
For example, common mode noise such as background gas interference, temperature and humidity variation, optical circuit noise, etc. also affects the accuracy of detecting the gas concentration. In order to improve the accuracy of detecting the gas concentration, a reference optical path can be respectively introduced for the measuring optical path and the calibrating optical path on the basis of the original measuring optical path and the calibrating optical path of the gas detection device 10 to inhibit common mode noise in the process of detecting the gas concentration by the gas detection device 10. Specifically, the gas detection device 10 may further include a first beam splitter 17 and a second beam splitter 18, after the first laser 11 emits the first laser light to the absorption air chamber 13, the first laser light is first transmitted into the first beam splitter 17, and the first laser light is split into the first signal laser light and the first reference laser light by the first beam splitter 17, where the first signal laser light is transmitted through the absorption air chamber 13, and the first reference laser light is directly received by the detector 15 (an optical path where the first reference laser light is located is a reference optical path of the measurement optical path). When the second laser 12 emits the second laser light to the vacuum chamber 14, the second laser light will be transmitted into the second beam splitter 18, and the second beam splitter 18 can split the second laser light into the second signal laser light and the second reference laser light, where the second signal laser light is transmitted through the vacuum chamber 14, and the second reference laser light is directly received by the detector 15 (the optical path where the second reference laser light is located is the reference optical path of the calibration optical path). The detector 15 converts the first signal laser light transmitted through the absorption cell 13 into a third electrical signal, converts the first reference laser light into a fourth electrical signal, and converts the second signal laser light transmitted through the vacuum cell 14 into a fifth electrical signal, and converts the second reference laser light into a sixth electrical signal. The detector 15 may then send the third, fourth, fifth and sixth electrical signals to the control unit 16.
After receiving the third electrical signal, the fourth electrical signal, the fifth electrical signal, and the sixth electrical signal, the control unit 16 may determine a measured absorption peak of the gas to be measured according to the third electrical signal and the fourth electrical signal. For example, the control unit 16 may amplify the third electric signal and the fourth electric signal to the same amplitude, input the two amplified electric signals to the subtracter to perform subtraction operation, so as to suppress common mode noise causing fluctuation of the measurement optical path, and extract the measured absorption peak of the gas to be measured according to the signal output by the subtracter. Meanwhile, the control unit 16 may determine the measured calibration peak of the second laser light according to the fifth electrical signal and the sixth electrical signal. For example, the control unit 16 may amplify the fifth electric signal and the sixth electric signal to the same amplitude, input the two amplified electric signals to the subtractor to perform subtraction operation to suppress common mode noise causing fluctuation of the calibration optical path, and extract the actually measured calibration peak of the second laser light from the signal output by the subtractor.
The control unit 16 may then determine the gas concentration of the gas to be measured from the measured absorption peak and the measured calibration peak. For example, the control unit 16 may determine a target ratio of the intensity of the preset calibration peak to the intensity of the actually measured calibration peak, determine a target preset corresponding relationship from a plurality of first preset corresponding relationships according to the target ratio, and determine the gas concentration according to the intensity of the actually measured absorption peak through the target preset corresponding relationship. The first preset corresponding relation is a corresponding relation between the strength of the actually measured absorption peak and the gas concentration, and each first preset corresponding relation corresponds to a ratio. It should be noted that, each first preset correspondence is a correspondence established after taking into consideration the effects of the measurement light path and the calibration light path, the first laser 11 and the second laser 12, and the differences between the absorption gas chamber 13 and the vacuum gas chamber 14 (for example, the first laser 11 and the second laser 12 are the same brand and the same model, but there is still an individual difference between the first laser 11 and the second laser 12).
It should be noted that the detector 15 may also include 4 detectors, each of which corresponds to one path of optical path and measures the laser light of the optical path, that is, the 4 detectors are respectively used for measuring the first signal laser light, the first reference laser light, the second signal laser light, and the second reference laser light.
Fig. 3 is a schematic view of a structure of another gas detecting apparatus according to the embodiment shown in fig. 1. As shown in fig. 3, the gas detection device 10 further includes a vacuum pump 19 connected to the absorption gas chamber 13, and the vacuum pump 19 is connected to the control unit 16.
The control unit 16 is further configured to control the vacuum pump 19 to pump the gas in the absorption gas chamber 13 to the outside before controlling the first laser 11 to emit the first laser light, and control the first laser 11 to emit the third laser light with the preset intensity to the absorption gas chamber 13, so that the third laser light is transmitted through the absorption gas chamber 13.
The control unit 16 is further configured to control the second laser 12 to emit a fourth laser light with a preset intensity to the vacuum chamber 14 before controlling the second laser 12 to emit the second laser light, so that the fourth laser light is transmitted through the vacuum chamber 14.
The detector 15 is further configured to convert the third laser light transmitted through the absorption gas cell 13 into a seventh electrical signal, and convert the fourth laser light transmitted through the vacuum gas cell 14 into an eighth electrical signal.
The control unit 16 is further configured to calibrate the gas concentration according to the seventh electrical signal, the eighth electrical signal, and the preset intensity, to obtain a calibrated gas concentration.
In one scenario, as the operating time increases, the first laser 11 and the second laser 12 may experience power decay, which may lead to inaccurate final determination of the gas concentration. In order to further improve the accuracy of detecting the gas concentration, the determined gas concentration may also be compensated for according to the specific power attenuation of the first laser 11 and the second laser 12. Specifically, the gas detection apparatus 10 may further include a vacuum pump 19 controlled by the control unit 16, and the control unit 16 may control the vacuum pump 19 to pump the gas in the absorption gas chamber 13 to the outside before controlling the first laser 11 to emit the first laser light to the absorption gas chamber 13, so that the absorption gas chamber 13 forms a vacuum chamber, and control the first laser 11 to emit the third laser light of a preset intensity to the absorption gas chamber 13, so that the third laser light is transmitted through the absorption gas chamber 13. Meanwhile, the control unit 16 may also control the second laser 12 to emit the fourth laser light of a preset intensity to the vacuum chamber 14 so that the fourth laser light is transmitted through the vacuum chamber 14 before controlling the second laser 12 to emit the second laser light to the vacuum chamber 14.
Then, the detector 15 receives the third laser light transmitted through the absorption cell 13 and converts it into a seventh electrical signal, while the detector 15 receives the fourth laser light transmitted through the vacuum cell 14 and converts it into an eighth electrical signal. Then, the detector 15 may send the seventh and eighth electrical signals to the control unit 16. After receiving the fifth and sixth electrical signals, the control unit 16 may determine the first compensation coefficient according to the seventh electrical signal, the eighth electrical signal, and the preset intensity. For example, the control unit 16 may determine the first laser intensity of the third laser transmitted through the absorption air chamber 13 according to the seventh electrical signal, determine the second laser intensity of the fourth laser transmitted through the vacuum air chamber 14 according to the eighth electrical signal, and determine the first compensation coefficient according to the first laser difference and the second laser difference and the preset second correspondence relationship by using the difference between the first laser intensity and the preset intensity as the first laser difference and the difference between the second laser intensity and the preset intensity as the second laser difference. The second corresponding relation is a corresponding relation among the first laser difference, the second laser difference and the first compensation coefficient. After the first compensation coefficient is determined, the gas to be detected can be introduced into the absorption gas chamber 13 (by firstly vacuumizing the absorption gas chamber 13 and then introducing the gas to be detected, the influence of other gases in the absorption gas chamber 13 on the concentration of the detected gas can be avoided to a certain extent, and the accuracy of the concentration of the detected gas is improved), so that the concentration of the gas to be detected is detected. After determining the gas concentration of the gas to be measured, the control unit 16 may calibrate the gas concentration according to the first compensation coefficient, to obtain the calibrated gas concentration. For example, the control unit 16 may take the product of the first compensation coefficient and the determined gas concentration as the calibrated gas concentration.
Optionally, the control unit 16 is configured to:
first usage time information of the absorption air cell 13 and second usage time information of the vacuum air cell 14 are acquired.
And determining a second compensation coefficient according to the first using time information and the second using time information by utilizing a preset third corresponding relation. The third correspondence is a correspondence among the first usage time information, the second usage time information, and the second compensation coefficient.
And calibrating the gas concentration according to the second compensation coefficient to obtain the calibrated gas concentration.
In another scenario, the optical path length of the absorption gas cell 13 and the optical path length of the vacuum gas cell 14 may change with increasing operating time (e.g., the absorption gas cell 13 and the vacuum gas cell 14 are dirty), and if the optical path lengths of the absorption gas cell 13 and the vacuum gas cell 14 change greatly, the final determined gas concentration may be inaccurate. In order to further improve the accuracy of detecting the gas concentration, the determined gas concentration can be compensated according to the specific optical path change condition of the absorption gas chamber 13 and the vacuum gas chamber 14.
Specifically, the control unit 16 may acquire the first usage time information of the absorption gas chamber 13 and the second usage time information of the vacuum gas chamber 14, respectively, after determining the gas concentration. The first usage time information and the second usage time information may include a working time period, a device delivery time period, a maintenance frequency, and the like. Then, the control unit 16 may determine a second compensation coefficient according to the first usage time information and the second usage time information by using the third correspondence relationship, and calibrate the gas concentration according to the second compensation coefficient, to obtain the calibrated gas concentration. For example, the control unit 16 may take the product of the second compensation coefficient and the gas concentration of the gas to be measured as the calibrated gas concentration.
The two compensation methods of compensating the gas concentration of the gas to be measured by the first compensation coefficient and compensating the gas concentration of the gas to be measured by the second compensation coefficient may calibrate the gas concentrations determined by the first electrical signal and the second electrical signal (i.e., the gas concentrations obtained after suppressing the influence of the non-absorption loss on the determined gas concentration) at the same time, or may calibrate the gas concentrations determined by the third electrical signal, the fourth electrical signal, the fifth electrical signal and the sixth electrical signal (i.e., the gas concentrations obtained after suppressing the influence of the non-absorption loss and the common mode noise on the determined gas concentration) at the same time. However, when the two compensation methods are used simultaneously to calibrate the gas concentration, it is necessary to calibrate the gas concentration by using the first compensation coefficient first, and after the gas concentration calibration by using the first compensation coefficient is completed, then to calibrate the gas concentration by using the second compensation coefficient. This is because the error caused by the power attenuation of the laser is larger than the error caused by the change of the optical path length of the air chamber, and in order to improve the accuracy of detecting the gas concentration, the larger error needs to be calibrated first and then the smaller error needs to be calibrated.
In summary, the gas detection device provided in the embodiment of the disclosure includes: the device comprises a first laser, a second laser, an absorption air chamber, a vacuum air chamber, a detector and a control unit, wherein the control unit is used for controlling the first laser to emit first laser to the absorption air chamber according to a first scanning modulation signal, the control unit is also used for controlling the second laser to emit second laser to the vacuum air chamber according to a second scanning modulation signal, the second laser is laser with a preset calibration peak according to the second scanning modulation signal, the generated emission spectrum of the second laser is provided with the detector, the detector is used for converting the first laser transmitted through the absorption air chamber into a first electric signal and converting the second laser transmitted through the vacuum air chamber into a second electric signal, and the control unit is also used for determining the gas concentration of gas to be detected according to the first electric signal and the second electric signal. The gas detection device in the disclosure determines the gas concentration of the gas to be detected by combining the first electric signal converted by the first laser after being transmitted through the absorption gas chamber and the second electric signal converted by the second laser after being transmitted through the vacuum gas chamber, so that in the process of determining the gas concentration according to the absorption peak of the gas to be detected, the preset calibration peak of the second laser is introduced to reduce the influence of non-absorption loss on determining the gas concentration, thereby improving the accuracy of detecting the gas concentration.
Fig. 4 is a flow chart illustrating a method of gas detection according to an exemplary embodiment. As shown in fig. 4, the gas detection device applied to any one of the above-mentioned fig. 1 to 3 may include the steps of:
Fig. 5 is a flow chart according to one of the steps 203 shown in fig. 4. As shown in fig. 5, step 203 may include the steps of:
Fig. 6 is a flow chart illustrating another gas detection method according to an exemplary embodiment. As shown in fig. 6, the gas detection device further includes a first beam splitter disposed on a transmission optical path of the first laser light and a second beam splitter disposed on a transmission optical path of the second laser light. The first beam splitter is used for dividing the first laser into first signal laser and first reference laser, and transmitting the first signal laser through the absorption air chamber, so that the first reference laser is directly received by the detector. And the second beam splitter is used for splitting the second laser into second signal laser and second reference laser, transmitting the second signal laser through the vacuum air chamber and enabling the second reference laser to be directly received by the detector. Step 203 may be implemented by:
the gas concentration is determined from the third electrical signal, the fourth electrical signal, the fifth electrical signal, and the sixth electrical signal. The third electric signal is obtained by the detector according to the first signal laser transmitted through the absorption air chamber, and the fourth electric signal is obtained by the detector according to the first reference laser. The fifth electric signal is obtained by the detector according to the second signal laser after the transmission through the vacuum air chamber, and the sixth electric signal is obtained by the detector according to the second reference laser.
Optionally, determining the gas concentration from the third electrical signal, the fourth electrical signal, the fifth electrical signal, and the sixth electrical signal may include the steps of:
and determining an actual measurement absorption peak of the gas to be detected according to the third electric signal and the fourth electric signal, and determining an actual measurement calibration peak of the second laser according to the fifth electric signal and the sixth electric signal.
And determining the gas concentration according to the measured absorption peak and the measured calibration peak.
Optionally, determining the gas concentration from the measured absorption peak and the measured calibration peak includes:
a target ratio of the intensity of the preset calibration peak to the intensity of the measured calibration peak is determined.
And determining a target preset corresponding relation from the first preset corresponding relations according to the target ratio. The first preset corresponding relation is a corresponding relation between the strength of the actually measured absorption peak and the gas concentration, and each first preset corresponding relation corresponds to a specific value.
And determining the gas concentration according to the strength of the actually measured absorption peak through a target preset corresponding relation.
Fig. 7 is a flow chart illustrating another gas detection method according to an exemplary embodiment. As shown in fig. 7, the gas detection device further includes a vacuum pump connected to the absorption gas chamber, the vacuum pump being connected to the control unit, and the method may further include the steps of:
And step 206, calibrating the gas concentration according to the seventh electric signal, the eighth electric signal and the preset intensity to obtain the calibrated gas concentration. The seventh electric signal is obtained by the detector according to the third laser after the transmission of the third electric signal passes through the absorption air chamber, and the eighth electric signal is obtained by the detector according to the fourth laser after the transmission of the fourth electric signal passes through the vacuum air chamber.
Fig. 8 is a flow chart according to one of the steps 206 shown in fig. 7. As shown in fig. 8, step 206 may include the steps of:
in step 2061, a first compensation factor is determined based on the seventh electrical signal, the eighth electrical signal, and the preset intensity.
And step 2062, calibrating the gas concentration according to the first compensation coefficient to obtain the calibrated gas concentration.
Alternatively, step 2061 may be accomplished by:
The first laser intensity of the third laser light transmitted through the absorption gas chamber is determined from the seventh electric signal, and the second laser intensity of the fourth laser light transmitted through the vacuum gas chamber is determined from the eighth electric signal.
The difference between the first laser intensity and the preset intensity is taken as a first laser difference, and the difference between the second laser intensity and the preset intensity is taken as a second laser difference.
And determining a first compensation coefficient according to the first laser difference and the second laser difference by utilizing a preset second corresponding relation. The second corresponding relation is a corresponding relation among the first laser difference, the second laser difference and the first compensation coefficient.
Fig. 9 is a flow chart illustrating yet another gas detection method according to an exemplary embodiment. As shown in fig. 9, the method may further include the steps of:
And step 209, calibrating the gas concentration according to the second compensation coefficient to obtain the calibrated gas concentration.
The specific manner in which the operations of the respective steps are performed in relation to the method of the above-described embodiment has been described in detail in relation to the embodiment of the gas detection apparatus 10, and will not be described in detail herein.
In summary, according to the gas detection method provided by the embodiment of the disclosure, first, according to the first scan modulation signal, the first laser is controlled to emit first laser light to the absorption gas chamber, and according to the second scan modulation signal, the second laser is controlled to emit second laser light to the vacuum gas chamber, wherein the second laser light is laser light with a preset calibration peak according to an emission spectrum generated by the second laser according to the second scan modulation signal, and then, according to the first electrical signal and the second electrical signal, the gas concentration of the gas to be detected is determined, wherein the first electrical signal is obtained by the detector according to the first laser light after the first electrical signal is transmitted through the absorption gas chamber, and the second electrical signal is obtained by the detector according to the second laser light after the second electrical signal is transmitted through the vacuum gas chamber. According to the method, the gas concentration of the gas to be detected is determined by combining the first electric signal converted by the first laser after being transmitted through the absorption gas chamber and the second electric signal converted by the second laser after being transmitted through the vacuum gas chamber, so that in the process of determining the gas concentration according to the absorption peak of the gas to be detected, the influence of non-absorption loss on determining the gas concentration is reduced by introducing the preset calibration peak of the second laser, and the accuracy of detecting the gas concentration is improved.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (7)
1. The gas detection device is characterized by comprising a first laser, a second laser, an absorption air chamber, a vacuum air chamber, a detector and a control unit; the first laser, the second laser and the detector are respectively connected with the control unit; the absorption air chamber contains gas to be detected;
The control unit is used for controlling the first laser to emit first laser to the absorption air chamber according to a preset first scanning modulation signal so as to enable the first laser to transmit through the absorption air chamber; the gas to be detected has an absorption peak in a scanning range of the wavelength emitted by the first laser;
the control unit is further used for controlling the second laser to emit second laser to the vacuum air chamber according to a preset second scanning modulation signal so as to enable the second laser to transmit through the vacuum air chamber; the second laser is laser with an emission spectrum having a preset calibration peak according to the second scanning modulation signal; the preset calibration peak and the absorption peak are not overlapped;
the detector is used for converting the first laser transmitted through the absorption air chamber into a first electric signal and converting the second laser transmitted through the vacuum air chamber into a second electric signal;
the control unit is further used for determining the gas concentration of the gas to be detected according to the first electric signal and the second electric signal;
the gas detection device further comprises a vacuum pump connected with the absorption air chamber; the vacuum pump is connected with the control unit;
The control unit is further used for controlling the vacuum pump to pump the gas in the absorption air chamber to the outside before controlling the first laser to emit the first laser, and controlling the first laser to emit third laser with preset intensity to the absorption air chamber so that the third laser is transmitted through the absorption air chamber;
the control unit is further used for controlling the second laser to emit fourth laser with the preset intensity to the vacuum air chamber before controlling the second laser to emit the second laser so as to enable the fourth laser to transmit through the vacuum air chamber;
the detector is also used for converting the third laser light transmitted through the absorption air chamber into a seventh electric signal and converting the fourth laser light transmitted through the vacuum air chamber into an eighth electric signal;
the control unit is further configured to calibrate the gas concentration according to the seventh electrical signal, the eighth electrical signal, and the preset intensity, to obtain a calibrated gas concentration.
2. The gas detection apparatus according to claim 1, wherein the control unit is configured to:
extracting an actual measurement absorption peak of the gas to be detected according to the first electric signal, and extracting an actual measurement calibration peak of the second laser according to the second electric signal;
And determining the gas concentration according to the measured absorption peak and the measured calibration peak.
3. The gas detection apparatus according to claim 2, wherein the control unit is configured to:
determining a target ratio of the intensity of the preset calibration peak to the intensity of the actually measured calibration peak;
determining a target preset corresponding relation from a plurality of first preset corresponding relations according to the target ratio; the first preset corresponding relation is a corresponding relation between the strength of the actually measured absorption peak and the gas concentration, and each first preset corresponding relation corresponds to a specific value;
and determining the gas concentration according to the strength of the actually measured absorption peak and the target preset corresponding relation.
4. The gas detection apparatus according to claim 1, wherein the control unit is configured to:
determining a first compensation coefficient according to the seventh electric signal, the eighth electric signal and the preset intensity;
and calibrating the gas concentration according to the first compensation coefficient to obtain the calibrated gas concentration.
5. The gas detection apparatus according to claim 4, wherein the control unit is configured to:
Determining the first laser intensity of the third laser transmitted through the absorption air chamber according to the seventh electric signal, and determining the second laser intensity of the fourth laser transmitted through the vacuum air chamber according to the eighth electric signal;
taking the difference between the first laser intensity and the preset intensity as a first laser difference and taking the difference between the second laser intensity and the preset intensity as a second laser difference;
determining a first compensation coefficient according to the first laser difference and the second laser difference by using a preset second corresponding relation; the second correspondence is a correspondence between the first laser difference, the second laser difference, and the first compensation coefficient.
6. The gas detection apparatus according to claim 1, wherein the control unit is configured to:
acquiring first service time information of the absorption air chamber and second service time information of the vacuum air chamber;
determining a second compensation coefficient according to the first usage time information and the second usage time information by using a preset third corresponding relation; the third corresponding relation is a corresponding relation among the first using time information, the second using time information and the second compensation coefficient;
And calibrating the gas concentration according to the second compensation coefficient to obtain the calibrated gas concentration.
7. A gas detection method, characterized by being applied to the gas detection apparatus according to any one of claims 1 to 6, comprising:
according to a preset first scanning modulation signal, a first laser is controlled to emit first laser to an absorption air chamber so that the first laser is transmitted through the absorption air chamber; the gas to be detected has an absorption peak in a scanning range of the wavelength emitted by the first laser;
according to a preset second scanning modulation signal, a second laser is controlled to emit second laser to a vacuum air chamber so that the second laser is transmitted through the vacuum air chamber; the second laser is laser with an emission spectrum having a preset calibration peak according to the second scanning modulation signal; the preset calibration peak and the absorption peak are not overlapped;
determining the gas concentration of the gas to be detected according to the first electric signal and the second electric signal; the first electric signal is obtained by the detector according to the first laser transmitted through the absorption air chamber, and the second electric signal is obtained by the detector according to the second laser transmitted through the vacuum air chamber;
Before the first laser is controlled to emit first laser light to an absorption air chamber, a vacuum pump is controlled to pump air in the absorption air chamber to the outside, and the first laser is controlled to emit third laser light with preset intensity to the absorption air chamber so that the third laser light is transmitted through the absorption air chamber;
before the second laser is controlled to emit second laser light to the vacuum air chamber, the second laser is controlled to emit fourth laser light with the preset intensity to the vacuum air chamber so that the fourth laser light is transmitted through the vacuum air chamber;
calibrating the gas concentration according to the seventh electric signal, the eighth electric signal and the preset intensity to obtain the calibrated gas concentration; the seventh electric signal is obtained by the detector according to the third laser after the transmission through the absorption air chamber, and the eighth electric signal is obtained by the detector according to the fourth laser after the transmission through the vacuum air chamber.
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| US8964185B1 (en) * | 2013-10-14 | 2015-02-24 | Beijing Information Science & Technology University | Gas detection system using a fiber laser with double-wavelength combination having reference-cavity compensation function |
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| CN211206244U (en) * | 2019-12-09 | 2020-08-07 | 济南德尔姆仪器有限公司 | Laser gas detector |
| CN110987869A (en) * | 2019-12-12 | 2020-04-10 | 华中科技大学 | Integrated optical fiber gas detection system and method |
| JPWO2022118694A1 (en) * | 2020-12-01 | 2022-06-09 | ||
| CN112903628A (en) * | 2021-01-25 | 2021-06-04 | 内蒙古光能科技有限公司 | Trace gas detection device in negative pressure state and detection method thereof |
| CN113916802A (en) * | 2021-09-30 | 2022-01-11 | 深圳市诺安环境安全股份有限公司 | Automatic calibration open-circuit type laser gas detection device and implementation method |
| CN114518340A (en) * | 2022-01-28 | 2022-05-20 | 中国人民解放军军事科学院国防科技创新研究院 | Gas concentration detection method, device and system |
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| WO2002090935A2 (en) * | 2001-03-19 | 2002-11-14 | Pranalytica, Inc. | Diagnostic method for high sensitivity detection of component concentrations in human gas emissions |
| US8964185B1 (en) * | 2013-10-14 | 2015-02-24 | Beijing Information Science & Technology University | Gas detection system using a fiber laser with double-wavelength combination having reference-cavity compensation function |
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