CN117347301A - Mixed gas detection device, method, electronic device, and storage medium - Google Patents
Mixed gas detection device, method, electronic device, and storage medium Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 211
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000011088 calibration curve Methods 0.000 claims abstract description 25
- 238000012937 correction Methods 0.000 claims abstract description 23
- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims description 36
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 21
- 239000005977 Ethylene Substances 0.000 claims description 21
- 238000007405 data analysis Methods 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 15
- 230000006870 function Effects 0.000 claims description 12
- 238000011896 sensitive detection Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004590 computer program Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000001285 laser absorption spectroscopy Methods 0.000 description 1
- 238000001307 laser spectroscopy Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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Abstract
The invention provides a mixed gas detection device, a method, an electronic device and a storage medium, wherein the mixed gas detection method comprises the following steps: respectively calibrating the mixed gases to obtain a calibration curve; and adding a second harmonic analysis, and completing the second harmonic correction under the ethane characteristic wavelength during the gas mixture detection according to the time domain waveform linear correction principle. The beneficial effects of the invention are as follows: the stability and the accuracy of mixed gas detection which is easily influenced by noise and has coincident wavelengths are improved.
Description
Technical Field
The present invention relates to the field of power and gas detection technologies, and in particular, to a mixed gas detection device, a mixed gas detection method, an electronic device, and a storage medium.
Background
Analysis of dissolved gases in transformer insulating oil is an effective method for assessing transformer operating conditions and identifying early faults. The main fault characteristic value gases in the transformer insulating oil comprise acetylene, methane, ethylene, ethane, carbon monoxide, carbon dioxide and the like. Aiming at the problems of high maintenance cost, easiness in vibration or noise influence and the like of the existing monitoring methods for the dissolved gas in the transformer insulating oil such as gas chromatography, photoacoustic spectrometry and the like, the tunable semiconductor laser spectroscopy (TDLAS) technology has the advantages of non-contact measurement, electromagnetic interference resistance and the like, and particularly has a good development prospect in near infrared bands, and the online monitoring method for the transformer based on the TDLAS has the advantages of low cost, simplicity in application and development and the like.
However, when achieving the main fault characteristic value gases (such as acetylene, methane, ethylene, ethane, carbon monoxide and carbon dioxide) in transformer insulating oil based on TDLAS, there are two problems:
(1) Because ethane gas is weak in near infrared absorption and is easily affected by noise, the detection lower limit and stability of ethane based on TDLAS are poor;
(2) The ethane and ethylene absorption wavelengths overlap, and gas cross interference exists, and particularly, the cross interference of ethylene gas on ethane detection is not negligible.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a mixed gas detection device, a method, electronic equipment and a storage medium, which improve the stability and accuracy of mixed gas detection which is easily affected by noise and has coincident wavelengths.
The invention provides a mixed gas detection device, which comprises a control module, wherein the control module comprises a laser driving module, a near infrared distributed feedback laser, an air chamber, a detector, a data acquisition module and a data analysis module:
the laser driving module, the near infrared distributed feedback laser, the air chamber, the detector, the data acquisition module and the data analysis module are connected in sequence;
the data analysis module comprises a phase-locked amplifier unit, a correction unit and a second harmonic analysis unit, wherein the phase-locked amplifier unit is respectively connected with the correction unit and the second harmonic analysis unit, and the correction unit is connected with the second harmonic analysis unit; the data analysis module is respectively connected with the laser driving module and the data acquisition module through the phase-locked amplifier unit;
the gas chamber is used for accessing mixed gas, and the mixed gas comprises first gas and second gas;
the laser driving module is used for acquiring a modulation signal of the lock-in amplifier unit, generating a modulated laser beam with a first wavelength according to the modulation signal and passing through the air chamber;
the data acquisition module is used for acquiring the electric signals of the detector to obtain signals to be detected;
the data analysis module obtains second harmonic according to the modulation signal and the signal to be detected;
the correction unit is used for correcting interference between the first gas and the second gas;
the second harmonic analysis module is used for analyzing the second harmonic to obtain the concentration of the first gas and the concentration of the second gas;
the control module is used for controlling the mixed gas detection device, storing data and displaying the gas concentration.
The mixed gas detection method comprises a phase-locked amplifier unit, a phase-sensitive detection subunit and a filtering subunit, wherein the phase-locked amplifier unit comprises a modulation signal subunit, the phase-sensitive detection subunit and the filtering subunit are sequentially connected, the modulation signal subunit is connected with the laser driving module, and the filtering subunit is connected with the correction unit;
the modulation signal subunit is used for generating saw-tooth wave and sine wave signals with adjustable unit amplitude and frequency, and sending the saw-tooth wave and the sine wave signals to the laser driving module as the modulation signals;
the phase-sensitive detection subunit is used for generating a demodulation signal according to the modulation signal and the signal to be detected;
the filtering subunit is used for filtering alternating current signals and noise signals in the demodulation signals by adopting a low-pass filter to obtain the second harmonic.
The method for detecting mixed gas according to claim, wherein a first gas and the second gas have cross interference and overlap in absorption wavelength, the first gas is ethane, and the second gas is ethylene.
The method for detecting mixed gas according to the present invention, wherein the wavelength range of the laser beam generated by the near infrared distributed feedback laser is 1679nm to 1681nm, the center wavelength is 1680nm, the first gas is ethane, 1680.1nm is a characteristic absorption wavelength, and the second gas is ethylene, 1681.1nm is a characteristic absorption wavelength.
One aspect of the present invention provides a method for detecting a mixed gas, including:
respectively calibrating the first gas and the second gas to obtain a first calibration curve of the first gas and a second calibration curve of the second gas;
introducing the second gas with the first concentration into the air chamber, and detecting by adopting the characteristic absorption wavelength of the second gas to obtain a first second harmonic waveform;
introducing mixed gas with different concentrations into the gas chamber, detecting by adopting the characteristic absorption wavelength of the second gas to obtain a third characteristic value of the mixed gas, and determining the second concentration of the second gas in the mixed gas according to the third characteristic value and the second calibration curve;
detecting by adopting the characteristic absorption wavelength of the first gas to obtain a second harmonic waveform, and correcting the second harmonic waveform to obtain a third second harmonic waveform after the interference of the second gas is corrected;
and determining a fourth characteristic value of a third second harmonic waveform, and determining a third concentration of the first gas according to the fourth characteristic value and the first calibration curve.
The mixed gas detection method, wherein the first gas and the second gas are calibrated respectively to obtain a first calibration curve of the first gas and a second calibration curve of the second gas, comprises the following steps:
introducing first gases with different calibration concentrations into the air chamber, detecting by adopting characteristic absorption wavelengths of the first gases, calculating first characteristic values of the first gases with different calibration concentrations through second harmonics, and performing linear fitting according to the first characteristic values and the calibration concentrations to obtain a first calibration curve of the first gases;
and introducing second gases with different calibration concentrations into the air chamber, detecting by adopting the characteristic absorption wavelength of the second gases, calculating second characteristic values of the second gases with different calibration concentrations through second harmonics, and performing linear fitting according to the second characteristic values and the calibration concentrations to obtain a second calibration curve of the second gases.
The method for detecting mixed gas, wherein the second harmonic waveform is corrected to obtain a third second harmonic waveform after the second gas interference is corrected, comprises the following steps:
using the formula
And correcting the second harmonic waveform, wherein Y' is the third second harmonic waveform, Y is the second harmonic waveform, Y is the second concentration of the second gas, X is the first concentration of the second gas, and X is the first second harmonic waveform.
The method for detecting mixed gas, wherein the method further comprises the following steps:
the characteristic calculation of the gas comprises obtaining absorption peak width information a according to the peak information and the trough information of the second harmonic;
cutting off the second harmonic by adopting a window function with the length of N to obtain a cut-off signal W (N), wherein N is the length of the second harmonic, and N represents a positive integer smaller than N;
the gas characteristic values c, c are calculated by the following way
Where k=n/a.
Another aspect of an embodiment of the present invention provides an electronic device, including a processor and a memory;
the memory is used for storing programs;
the processor executes the program to implement the method as described above.
Embodiments of the present invention also disclose a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The computer instructions may be read from a computer-readable storage medium by a processor of a computer device, and executed by the processor, cause the computer device to perform the method described previously.
The beneficial effects of the invention are as follows: aiming at the gas which is easily influenced by noise and is weak in absorption, the invention increases the second harmonic analysis on the basis of the traditional phase-locked amplifier so as to improve the detection stability and the lower limit of the target gas which is easily influenced by noise and has coincident wavelength; aiming at the cross interference among the mixed gases, the invention completes the second harmonic correction under the characteristic wavelength of ethane during the detection of the mixed gases according to the time domain waveform linear correction principle so as to improve the accuracy of ethane detection in the mixed gases.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic diagram of a mixed gas detecting device according to an embodiment of the present invention.
Fig. 2 is a block diagram of a lock-in amplifier unit of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a mixed gas detection flow according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. In the following description, suffixes such as "module", "part" or "unit" for representing elements are used only for facilitating the description of the present invention, and have no particular meaning in themselves. Thus, "module," "component," or "unit" may be used in combination. "first", "second", etc. are used for the purpose of distinguishing between technical features only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated. In the following description, the continuous reference numerals of the method steps are used for facilitating examination and understanding, and the technical effects achieved by the technical scheme of the invention are not affected by adjusting the implementation sequence among the steps in combination with the overall technical scheme of the invention and the logic relations among the steps. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a mixed gas detection device according to an embodiment of the present invention, where the mixed gas detection device includes a control module, and the control module includes a laser driving module, a near infrared distributed feedback laser, a gas chamber, a detector, a data acquisition module, and a data analysis module: the system comprises a laser driving module, a near infrared distributed feedback laser, an air chamber, a detector, a data acquisition module and a data analysis module, wherein the laser driving module, the near infrared distributed feedback laser, the air chamber, the detector, the data acquisition module and the data analysis module are connected in sequence; the data analysis module comprises a phase-locked amplifier unit, a correction unit and a second harmonic analysis unit, wherein the phase-locked amplifier unit is respectively connected with the correction unit and the second harmonic analysis unit, and the correction unit is connected with the second harmonic analysis unit; the data analysis module is respectively connected with the laser driving module and the data acquisition module through the phase-locked amplifier unit; the gas chamber is used for accessing mixed gas, and the mixed gas comprises first gas and second gas; the laser driving module is used for acquiring a modulation signal of the lock-in amplifier unit, generating a modulated laser beam with a first wavelength according to the modulation signal and passing through the air chamber; the data acquisition module is used for acquiring an electric signal of the detector to obtain a signal to be detected; the data analysis module obtains a second harmonic according to the modulation signal and the signal to be detected; the correction unit is used for correcting interference between the first gas and the second gas; the second harmonic analysis module is used for analyzing the second harmonic to obtain the concentration of the first gas and the concentration of the second gas; the control module is used for controlling the mixed gas detection device, storing data and displaying gas concentration.
In some embodiments, the lock-in amplifier unit shown with reference to fig. 2 includes a modulation signal subunit, a phase-sensitive detection subunit, and a filtering subunit, where the modulation signal subunit, the phase-sensitive detection subunit, and the filtering subunit are sequentially connected, the modulation signal subunit is connected to the laser driving module, and the filtering subunit is connected to the correction unit; the modulation signal subunit is used for generating saw-tooth wave and sine wave signals with adjustable unit amplitude and frequency, and sending the saw-tooth wave and sine wave signals to the laser driving module as modulation signals; the phase-sensitive detection subunit is used for generating a demodulation signal according to the modulation signal and the signal to be detected; the filtering subunit is used for filtering alternating current signals and noise signals in the demodulation signals by adopting a low-pass filter to obtain second harmonic waves.
In some embodiments, a mixed gas detection device for tunable semiconductor laser absorption spectroscopy (TDLAS) is provided, where a first gas has cross interference with a second gas and has an absorption wavelength overlapping, the first gas is ethane, the second gas is ethylene, a wavelength interval of a laser beam generated by a near infrared distributed feedback laser is 1679nm to 1681nm, a center wavelength is 1680nm, the first gas is ethane, 1680.1nm is a characteristic absorption wavelength, the second gas is ethylene, and 1681.1nm is a characteristic absorption wavelength.
In some embodiments, reference is made to FIG. 3
And S100, calibrating the first gas and the second gas respectively to obtain a first calibration curve of the first gas and a second calibration curve of the second gas.
In some embodiments, introducing first gases with different calibration concentrations into the air chamber, detecting by adopting characteristic absorption wavelengths of the first gases, calculating first characteristic values of the first gases with different calibration concentrations through second harmonics, and performing linear fitting according to the first characteristic values and the calibration concentrations to obtain a first calibration curve of the first gases; and introducing second gases with different calibration concentrations into the air chamber, detecting by adopting the characteristic absorption wavelength of the second gases, calculating second characteristic values of the second gases with different calibration concentrations through second harmonics, and performing linear fitting according to the second characteristic values and the calibration concentrations to obtain a second calibration curve of the second gases.
It will be appreciated that different calibration concentrations, either a first gas or a second gas of known concentration, are used to derive the calibration curve.
And S200, introducing a first concentration of a second gas into the gas chamber, and detecting by adopting the characteristic absorption wavelength of the second gas to obtain a first second harmonic waveform.
Illustratively, ethane is used as a first gas, ethylene is used as a second gas, wherein the characteristic absorption wavelength of the first gas is 1680.1nm, the characteristic absorption wavelength of the second gas is 1681.1nm as shown above, and if the ethylene single gas with the concentration X is introduced into the gas chamber, the characteristic absorption wavelength of ethane is used for detection, and a second harmonic waveform in the lock-in amplifier module is recorded as X.
And S300, introducing mixed gases with different concentrations into the gas chamber, detecting by adopting the characteristic absorption wavelength of the second gas to obtain a third characteristic value of the mixed gas, and determining the second concentration of the second gas in the mixed gas according to the third characteristic value and the second calibration curve.
By taking ethane as a first gas and ethylene as a second gas, introducing mixed gas of ethane and ethylene with different concentrations into a gas chamber, detecting by adopting characteristic absorption wavelength of ethylene, calculating characteristic values by using a lock-in amplifier module and a second harmonic analysis module, and obtaining ethylene concentration y according to an ethylene calibration curve
S400, detecting by adopting the characteristic absorption wavelength of the first gas to obtain a second harmonic waveform, and correcting the second harmonic waveform to obtain a third harmonic waveform after the second gas is disturbed.
The ethane characteristic absorption wavelength is adopted for detection, a phase-locked amplifier module and a second harmonic analysis module are adopted to obtain a second harmonic Y, and an ethane correction unit is adopted to obtain a second harmonic Y 'after ethylene interference is corrected'
In some embodiments, wherein
S500, determining a fourth characteristic value of a third second harmonic waveform, and determining a third concentration of the first gas according to the fourth characteristic value and the first calibration curve.
In some embodiments, ethane is used as the first gas and ethylene is used as the second gas, wherein the characteristic calculation flow of the second harmonic analysis unit comprises:
the characteristic calculation of the gas comprises obtaining absorption peak width information a according to the peak information and the trough information of the second harmonic;
cutting off the second harmonic by adopting a window function with the length of N to obtain a cut-off signal W (N), wherein N is the length of the second harmonic, and N represents a positive integer smaller than N;
the gas characteristic values c, c are calculated by the following way
Where k=n/a.
The measurement of ethane and ethylene gas in transformer insulating oil is completed by applying the technology of the invention, and the results are shown in the following table 1:
table 1 measurement of ethane and ethylene gas in transformer insulating oil
The measurement error of the embodiment of the invention meets the A-level requirement of a transformer substation transformer detection device of 500kV and below in the technical specification of an on-line monitoring device for dissolved gas in Q/GDW10536-2021 transformer oil.
The beneficial effects of the invention are as follows: aiming at the gas which is easily influenced by noise and is weak in absorption, the invention increases the second harmonic analysis on the basis of the traditional phase-locked amplifier so as to improve the detection stability and the lower limit of the target gas which is easily influenced by noise and has coincident wavelength; aiming at the cross interference among the mixed gases, the invention completes the second harmonic correction under the characteristic wavelength of ethane during the detection of the mixed gases according to the time domain waveform linear correction principle so as to improve the accuracy of ethane detection in the mixed gases.
The embodiment of the invention also provides electronic equipment, which comprises a processor and a memory;
the memory stores a program;
the processor executes a program to execute the mixed gas detection method; the electronic equipment has the function of carrying and running the software system for detecting the mixed gas provided by the embodiment of the invention, for example, a control device based on a computer.
The embodiment of the invention also provides a computer-readable storage medium storing a program that is executed by a processor to implement the mixed gas detection method as described above.
In some alternative embodiments, the functions/acts noted in the block diagrams may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Furthermore, the embodiments presented and described in the flowcharts of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed, and in which sub-operations described as part of a larger operation are performed independently.
Embodiments of the present invention also disclose a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device may read the computer instructions from the computer-readable storage medium, and execute the computer instructions to cause the computer device to perform the aforementioned method of detecting a mixed gas.
Furthermore, while the invention is described in the context of functional modules, it should be appreciated that, unless otherwise indicated, one or more of the described functions and/or features may be integrated in a single physical device and/or software module or one or more functions and/or features may be implemented in separate physical devices or software modules. It will also be appreciated that a detailed discussion of the actual implementation of each module is not necessary to an understanding of the present invention. Rather, the actual implementation of the various functional modules in the apparatus disclosed herein will be apparent to those skilled in the art from consideration of their attributes, functions and internal relationships. Accordingly, one of ordinary skill in the art can implement the invention as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative and are not intended to be limiting upon the scope of the invention, which is to be defined in the appended claims and their full scope of equivalents.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments described above, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (10)
1. The mixed gas detection device is characterized by comprising a control module, wherein the control module comprises a laser driving module, a near infrared distributed feedback laser, an air chamber, a detector, a data acquisition module and a data analysis module:
the laser driving module, the near infrared distributed feedback laser, the air chamber, the detector, the data acquisition module and the data analysis module are connected in sequence;
the data analysis module comprises a phase-locked amplifier unit, a correction unit and a second harmonic analysis unit, wherein the phase-locked amplifier unit is respectively connected with the correction unit and the second harmonic analysis unit, and the correction unit is connected with the second harmonic analysis unit; the data analysis module is respectively connected with the laser driving module and the data acquisition module through the phase-locked amplifier unit;
the gas chamber is used for accessing mixed gas, and the mixed gas comprises first gas and second gas;
the laser driving module is used for acquiring a modulation signal of the lock-in amplifier unit, generating a modulated laser beam with a first wavelength according to the modulation signal and passing through the air chamber;
the data acquisition module is used for acquiring the electric signals of the detector to obtain signals to be detected;
the data analysis module obtains second harmonic according to the modulation signal and the signal to be detected;
the correction unit is used for correcting interference between the first gas and the second gas;
the second harmonic analysis module is used for analyzing the second harmonic to obtain the concentration of the first gas and the concentration of the second gas;
the control module is used for controlling the mixed gas detection device, storing data and displaying the gas concentration.
2. The method according to claim 1, wherein the lock-in amplifier unit includes a modulation signal subunit, a phase-sensitive detection subunit, and a filtering subunit, the modulation signal subunit, the phase-sensitive detection subunit, and the filtering subunit are sequentially connected, the modulation signal subunit is connected to the laser driving module, and the filtering subunit is connected to the correction unit;
the modulation signal subunit is used for generating saw-tooth wave and sine wave signals with adjustable unit amplitude and frequency, and sending the saw-tooth wave and the sine wave signals to the laser driving module as the modulation signals;
the phase-sensitive detection subunit is used for generating a demodulation signal according to the modulation signal and the signal to be detected;
the filtering subunit is used for filtering alternating current signals and noise signals in the demodulation signals by adopting a low-pass filter to obtain the second harmonic.
3. The method according to claim 1, wherein the first gas and the second gas have cross interference and overlap in absorption wavelength, the first gas is ethane, and the second gas is ethylene.
4. The method according to claim 3, wherein the wavelength range of the laser beam generated by the near infrared distributed feedback laser is 1679nm to 1681nm, the center wavelength is 1680nm, the characteristic absorption wavelength is 1680.1nm when the first gas is ethane, and the characteristic absorption wavelength is 1681.1nm when the second gas is ethylene.
5. A method of detecting a mixed gas in a device according to any one of claims 1 to 4, comprising:
respectively calibrating the first gas and the second gas to obtain a first calibration curve of the first gas and a second calibration curve of the second gas;
introducing the second gas with the first concentration into the air chamber, and detecting by adopting the characteristic absorption wavelength of the second gas to obtain a first second harmonic waveform;
introducing mixed gas with different concentrations into the gas chamber, detecting by adopting the characteristic absorption wavelength of the second gas to obtain a third characteristic value of the mixed gas, and determining the second concentration of the second gas in the mixed gas according to the third characteristic value and the second calibration curve;
detecting by adopting the characteristic absorption wavelength of the first gas to obtain a second harmonic waveform, and correcting the second harmonic waveform to obtain a third second harmonic waveform after the interference of the second gas is corrected;
and determining a fourth characteristic value of a third second harmonic waveform, and determining a third concentration of the first gas according to the fourth characteristic value and the first calibration curve.
6. The method for detecting mixed gas according to claim 5, wherein the calibrating the first gas and the second gas to obtain a first calibration curve of the first gas and a second calibration curve of the second gas includes:
introducing first gases with different calibration concentrations into the air chamber, detecting by adopting characteristic absorption wavelengths of the first gases, calculating first characteristic values of the first gases with different calibration concentrations through second harmonics, and performing linear fitting according to the first characteristic values and the calibration concentrations to obtain a first calibration curve of the first gases;
and introducing second gases with different calibration concentrations into the air chamber, detecting by adopting the characteristic absorption wavelength of the second gases, calculating second characteristic values of the second gases with different calibration concentrations through second harmonics, and performing linear fitting according to the second characteristic values and the calibration concentrations to obtain a second calibration curve of the second gases.
7. The method of detecting a mixed gas according to claim 5, wherein the correcting the second harmonic waveform to obtain a third second harmonic waveform after the correction of the second gas disturbance comprises:
using the formula
And correcting the second harmonic waveform, wherein Y' is the third second harmonic waveform, Y is the second harmonic waveform, Y is the second concentration of the second gas, X is the first concentration of the second gas, and X is the first second harmonic waveform.
8. The mixed gas detection method according to claim 5, characterized in that the method further comprises:
the characteristic calculation of the gas comprises obtaining absorption peak width information a according to the peak information and the trough information of the second harmonic;
cutting off the second harmonic by adopting a window function with the length of N to obtain a cut-off signal W (N), wherein N is the length of the second harmonic, and N represents a positive integer smaller than N;
the gas characteristic values c, c are calculated by the following way
Where k=n/a.
9. An electronic device comprising a processor and a memory;
the memory is used for storing programs;
the processor executes the program to implement the mixed gas detection method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the storage medium stores a program that is executed by a processor to implement the mixed gas detection method according to any one of claims 1 to 7.
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