Carbon disulfide concentration measurement method and system based on time modulation spectroscopy recovery

Abstract

This invention discloses a method and system for measuring carbon disulfide concentration based on time-modulated spectral reconstruction, relating to the field of gas concentration detection technology. It employs a deuterium lamp as the light source. The ultraviolet broadband light emitted by the deuterium lamp is modulated by an optical chopper to form modulated light, which is then collimated into parallel light by a first lens and incident into a gas cell. Absorption by the gas to be measured causes the spectral intensity of the parallel light to attenuate, forming transmitted light. The transmitted light is converged by a second lens and incident into an optical fiber, which then couples it into a CCD imaging spectrometer. A data acquisition card simultaneously acquires the spectral signal array output by the spectrometer, the modulation reference signal output by the optical chopper, and the trigger signal. A computer performs time-modulated spectral reconstruction processing on the spectral signals, and the concentration of the carbon disulfide to be measured is determined based on the spectral absorption intensity of carbon disulfide. This invention exhibits good signal stability and high identification capability for trace gas spectral signals.

Description

Technical Field

[0001] This invention relates to the field of gas concentration detection technology, specifically to a method and system for measuring carbon disulfide concentration based on time-modulated spectral reduction. Background Technology

[0002] Currently, chemical sensing is mainly used for on-site detection of carbon disulfide. However, chemical sensing signals decay over time, and lifetime and gas selectivity remain important research topics in chemical sensing. Spectroscopic detection methods are widely used in gas detection due to their high gas selectivity, good stability, non-contact nature, and ability to perform continuous long-term detection. Carbon disulfide exhibits strong spectral absorption characteristics in the ultraviolet band around 200 nm.

[0003] Existing ultraviolet broadband spectroscopy detection methods cannot achieve long-term continuous measurement of trace carbon disulfide concentration because the ultraviolet absorption signal of trace carbon disulfide is extremely weak and is easily drowned out by the inherent noise of CCD imaging spectrometers. Summary of the Invention

[0004] To address the shortcomings mentioned in the background art, the present invention aims to provide a method and system for measuring carbon disulfide concentration based on time-modulated spectral reduction, thereby solving the problem that the ultraviolet absorption signal of trace carbon disulfide is extremely weak and easily drowned out by the inherent noise of CCD imaging spectrometers in the prior art.

[0005] Firstly, the objective of this invention can be achieved through the following technical solution: a method for measuring carbon disulfide concentration based on time-modulated spectral reduction, the method comprising the following steps: A two-dimensional array of spectral intensity data and a modulation reference signal are obtained within a preset time unit. The two-dimensional array of spectral intensity data is split according to wavelength to obtain a time-varying sequence of spectral intensity for each wavelength. The average signal corresponding to the wavelength is obtained by multiplying the time-varying spectral intensity sequence of the wavelength with the modulation reference signal and then averaging the results. The average signal corresponding to the wavelength is then rearranged to obtain the transmission spectrum after the time-modulated spectrum is restored. The absorption spectral data of the transmission spectrum after time-modulated spectral reconstruction is processed to obtain the carbon disulfide spectral absorption intensity, and the carbon disulfide concentration is obtained based on the carbon disulfide spectral absorption intensity.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: the time unit is set by an integer number of complete modulation cycles of the optical chopper.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: the process of splitting the two-dimensional array of spectral intensity data by wavelength, comprising: The two-dimensional array of spectral intensity is divided into multiple one-dimensional arrays of single-wavelength spectral intensity changing over time according to wavelength. The number of one-dimensional arrays is equal to the number of wavelengths that can be collected. Each one-dimensional array corresponds to the time-varying sequence of spectral intensity of wavelength in the current time period.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: the process of processing the absorption spectral data of the transmission spectrum after the time-modulated spectrum is restored, comprising: Based on Beer-Lambert's law, the absorbance of parallel light is calculated using the transmission spectrum after time-modulated spectral reconstruction and the reference transmission spectrum, and is used as the spectral absorption intensity of carbon disulfide. The absorbance of parallel light is integrated to obtain optical parameters related to the carbon disulfide concentration. The carbon disulfide concentration is then obtained by comparing the optical parameters related to the carbon disulfide concentration with the carbon disulfide concentration calibration curve.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: the formula for calculating the absorbance of the parallel light is as follows: in, Indicates at wavelength The light intensity detected at that location is the transmission spectral intensity after time-modulated spectral reconstruction. Indicates at wavelength The incident light intensity at point is the transmission spectral intensity after time-modulated spectral reduction under conditions where high-purity nitrogen is filled into the gas cell.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: The average signal corresponding to the wavelength is rearranged in order according to the wavelength.

[0011] Secondly, in order to achieve the above objectives, the present invention discloses a carbon disulfide concentration measurement system based on time-modulated spectral reduction, comprising: a deuterium lamp, wherein the ultraviolet broadband light emitted by the deuterium lamp is modulated by an optical chopper and directed to a first lens, collimated and directed into a gas cell, and the light emitted from the gas cell is directed to one end of an optical fiber through a second lens. The other end of the optical fiber is connected to the optical signal receiving end of the CCD imaging spectrometer. The signal output terminal of the CCD imaging spectrometer is connected to the data input terminal of the data acquisition card. The signal output terminal of the optical chopper is connected to the data input terminal of the data acquisition card. The data output terminal of the data acquisition card is connected to the computer. The computer is used to execute the above-described method for measuring carbon disulfide concentration based on time-modulated spectral reduction.

[0012] In conjunction with the second aspect, in some implementations of the second aspect, the system further includes: the ultraviolet broadband light emitted by the deuterium lamp is modulated into modulated light by an optical chopper; the modulated light is collimated into parallel light by a first lens; the parallel light is incident into the gas cell, and the parallel light is absorbed by the gas in the gas cell, causing the spectral intensity of the parallel light to weaken and form transmitted light; the transmitted light is converged by a second lens to form converged light; the converged light is incident into a CCD imaging spectrometer through an optical fiber, and the CCD imaging spectrometer splits the converged light and converts it into a two-dimensional array of spectral intensity data arranged in wavelength order; the data acquisition card synchronously acquires the spectral signal array output by the CCD imaging spectrometer and the modulation reference signal output by the optical chopper, and receives the trigger signal emitted by the optical chopper; the computer controls the data acquisition card to sample and performs time-modulated spectral reconstruction on the acquired signal to obtain the time-modulated spectral reconstruction transmission spectrum; the computer processes the time-modulated spectral reconstruction transmission spectrum to obtain the carbon disulfide concentration in the gas in the gas cell.

[0013] In conjunction with the second aspect, in some implementations of the second aspect, the system further includes: the deuterium lamp having an emission spectrum in the 185-220 nm band; the first lens and the second lens being quartz convex lenses with high ultraviolet transmittance in the 185-220 nm band; and the optical fiber being quartz optical fiber with high ultraviolet transmittance in the 185-220 nm band.

[0014] The beneficial effects of this invention are: This invention uses an optical chopper to synchronously modulate the light intensity at different wavelengths. By extracting the modulated spectrum within a short time interval and performing time-domain demodulation in groups, the demodulated signals at each wavelength are then recombined according to wavelength to restore the denoised transmission spectrum. Combined with 200-210 nm ultraviolet absorption spectroscopy, this invention enables the measurement of trace carbon disulfide concentration, exhibiting good signal stability and high recognition capability of trace gas spectral signals. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the method flow of the present invention; Figure 2 This is a schematic diagram of the system structure of the present invention; Figure 3 This is a schematic diagram of the gas pool structure of the present invention; Figure 4 This is a schematic diagram of the time-modulated spectral restoration process of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: like Figure 1 As shown, a method for measuring carbon disulfide concentration based on time-modulated spectral reduction includes the following steps: S101: Obtain a two-dimensional array of spectral intensity data and a modulation reference signal within a preset time unit; split the two-dimensional array of spectral intensity data according to wavelength to obtain a time-varying sequence of spectral intensity for each wavelength. The time unit is set by an integer number of complete optical chopper modulation cycles.

[0018] The process of splitting a two-dimensional array of spectral intensity data by wavelength includes: The two-dimensional array of spectral intensity is divided into multiple one-dimensional arrays of single-wavelength spectral intensity changing over time according to wavelength. The number of one-dimensional arrays is equal to the number of wavelengths that can be collected. Each one-dimensional array corresponds to the time-varying sequence of spectral intensity of wavelength in the current time period.

[0019] The average signals corresponding to the wavelengths are rearranged and ordered according to the wavelength.

[0020] Specifically, in this embodiment, an integer number of complete modulation cycles of the optical chopper 2 are used as time units, and a two-dimensional array of spectral intensity data and the modulation reference signal within the same time period are extracted from a single time unit; such as Figure 4 As shown, the two-dimensional array of spectral intensity is divided into multiple one-dimensional arrays of single-wavelength spectral intensity changing over time according to wavelength. The number of one-dimensional arrays is equal to the number of wavelengths that can be collected. Each one-dimensional array corresponds to the time-varying sequence of the spectral intensity of that wavelength in the current time period.

[0021] Specifically, such as Figure 4 As shown, the time-modulated spectral reconstruction process is specifically as follows: The horizontal axis represents time (including an integer number of complete modulation cycles), and the vertical axis represents wavelength (or pixel number).

[0022] The initially acquired data is represented in computer memory as a two-dimensional matrix (a two-dimensional array of spectral intensity data).

[0023] Step A (splitting): Divide the two-dimensional matrix into multiple one-dimensional time series (i.e., time-varying sequences of single-wavelength spectral intensity) along the vertical axis (wavelength dimension). Step B (Time Domain Demodulation): Multiply each one-dimensional time series point by point with the synchronously acquired modulation reference signal (square wave or sine wave), and calculate the DC component within that period (i.e., calculate the average) to obtain the average signal corresponding to that wavelength. Step C (Reassembly): Rearrange the average signals corresponding to all wavelengths in ascending order to form a completely new one-dimensional spectral curve free of high-frequency random noise, which is the transmission spectrum after time-modulated spectral reconstruction. S102: Multiply the time-varying spectral intensity sequence of the wavelength with the modulation reference signal and calculate the mean to obtain the average signal corresponding to the wavelength. Rearrange the average signal corresponding to the wavelength to obtain the transmission spectrum after the time-modulated spectrum is restored. S103: Process the absorption spectral data of the transmission spectrum after the time-modulated spectrum is restored to obtain the carbon disulfide spectral absorption intensity, and obtain the carbon disulfide concentration based on the carbon disulfide spectral absorption intensity.

[0024] The process of processing the absorption spectral data of the transmission spectrum after the time-modulated spectrum is restored includes: Based on Beer-Lambert's law, the absorbance of parallel light is calculated using the transmission spectrum after time-modulated spectral reconstruction and the reference transmission spectrum, and is used as the spectral absorption intensity of carbon disulfide. The formula for calculating the absorbance of parallel light is as follows: in, Indicates at wavelength The light intensity detected at that location is the transmission spectral intensity after time-modulated spectral reconstruction. Indicates at wavelength The incident light intensity at point is the transmission spectral intensity after time-modulated spectral reduction under conditions where high-purity nitrogen is filled into the gas cell.

[0025] The Beer-Lambert law is described below: Johann Heinrich Lambert discovered the relationship between the thickness of the absorbing medium and the degree to which a substance absorbs light in 1760, and August Beer discovered the relationship between the concentration of the absorbing substance and the degree to which it absorbs light in 1852. These two discoveries combined form the Beer-Lambert Law, which is expressed as follows: In the formula The intensity of transmitted light after passing through the gaseous medium; The intensity of the incident light before it passes through the gaseous medium; The absorption cross section of the gas to be measured; The concentration of the gas to be measured; This represents the distance light travels within a gaseous medium.

[0026] Beer-Lambert's law is the theoretical basis for gas detection based on absorption spectroscopy and is widely used in the field of gas detection. Therefore, this invention uses Beer-Lambert's law to obtain the characteristic absorption spectrum signal of carbon disulfide in the 200-210 nm range.

[0027] Specifically, the present invention will be further illustrated below through embodiments: The absorbance of parallel light is integrated to obtain optical parameters related to the carbon disulfide concentration. The carbon disulfide concentration is then obtained by comparing the optical parameters related to the carbon disulfide concentration with the carbon disulfide concentration calibration curve.

[0028] The carbon disulfide concentration calibration curve shows the correspondence between the optical parameters of the carbon disulfide concentration detection system and the carbon disulfide concentration. The calibration curve can be obtained by filling a gas cell with a series of known concentrations of carbon disulfide standard gases and obtaining the optical parameter OP for each concentration of standard gas.

[0029] Example 2: To achieve the above objective, such as Figure 2 As shown, based on Embodiment 1, this invention discloses a carbon disulfide concentration measurement system based on time-modulated spectral reduction, comprising: 1. Deuterium lamp; 2. Optical chopper; 3. First lens; 4. Gas cell; 5. Second lens; 6. Optical fiber; 7. CCD imaging spectrometer; 8. Data acquisition card; and 9. Computer. The carbon disulfide gas to be tested flows into the gas pool 4 at a fixed flow rate; The ultraviolet broadband light emitted by the deuterium lamp 1 passes through the optical chopper 2 and the first lens 3 before entering the gas cell 4. The light emitted from the gas cell 4 passes through the second lens 5 and enters one end of the optical fiber 6. The first lens 3 is used to collimate the ultraviolet broadband light into parallel light, the second lens 5 is used to convert the transmitted light into focused light, and the optical fiber 6 is used to conduct the focused light. The optical fiber 6 is made of quartz fiber, which has better ultraviolet conductivity and can effectively prevent the light intensity of the focused light from weakening during the transmission process, thus preventing measurement errors. The other end of the optical fiber 6 is connected to the optical signal receiving end of the CCD imaging spectrometer 7, which is used to split the incident light and transmitted light and perform photoelectric conversion. The signal output terminal of the CCD imaging spectrometer 7 is connected to the data input terminal of the data acquisition card 8; The signal output terminal of the optical chopper 2 is connected to the data input terminal of the data acquisition card 8; The data output terminal of the data acquisition card 8 is connected to the computer 9.

[0030] In this embodiment, a deuterium lamp 1 is used as the light source. The ultraviolet broadband light emitted by the deuterium lamp 1 is modulated into modulated light by an optical chopper 2, and then collimated into parallel light by a first lens 3. The collimated parallel light is then injected into a gas cell 4, which is used to hold the carbon disulfide gas to be measured. The transmitted light emitted from the gas cell is focused by a second lens 5 and then injected into an optical fiber 6. The optical fiber 6 couples the light into a CCD imaging spectrometer 7. The CCD imaging spectrometer 7 transmits the data signal to a data acquisition card 8. The data acquisition card 8 synchronously acquires the modulation reference signal and trigger signal emitted by the optical chopper 2 and transmits all signals to a computer 9. Finally, the computer 9 controls the data acquisition card, restores the time-modulated spectrum, and performs absorption spectral data processing to obtain the concentration of the carbon disulfide gas to be measured.

[0031] Furthermore, the deuterium lamp's light outlet is equipped with an aperture stop, and the emitted light can be considered as a point light source; the optical chopper 2 is positioned close to the deuterium lamp's light outlet to ensure that the width of the light spot on the optical chopper 2 is smaller than the width of a single light-transmitting unit of the chopper; the first lens 3 and the second lens 5 are both quartz convex lenses.

[0032] like Figure 3 As shown, the gas pool 4 is provided with an injection window, an injection window, an inlet, and an outlet. In one embodiment, the incident window and the exit window of the gas cell 4 are located on the two end faces of the gas cell 4, and the inlet and the outlet are located on the two end sidewalls of the gas cell 4, respectively; the incident window and the exit window are both quartz windows with high ultraviolet transmittance in the 185-220nm wavelength band.

[0033] Specifically, this embodiment describes a measurement method for carbon disulfide concentration based on a time-modulated spectral reduction system. This method includes the following steps: Step 1: The ultraviolet broadband light emitted by the deuterium lamp 1 is modulated into modulated light by the optical chopper 2; Step 2: The modulated light is collimated into parallel light by the first lens 3; Step 3: Parallel light enters the gas cell 4. The parallel light is absorbed by the gas in the gas cell 4, which weakens the spectral intensity of the parallel light and forms transmitted light. Step 4: After the transmitted light passes through the second lens 5, it is converged to form converged light; Step 5: The focused light passes through fiber 6 and is incident into the CCD imaging spectrometer 7. The CCD imaging spectrometer 7 converts the focused light into an array of spectral intensity signals arranged in wavelength order. Step 6: Data acquisition card 8 synchronously acquires the spectral signal array output by CCD imaging spectrometer 7 and the modulation reference signal output by optical chopper 2, and receives the trigger signal issued by optical chopper 2. Step 7: The computer 9 controls the data acquisition card 8 to sample and performs time-modulated spectral reconstruction on the acquired signal to obtain the denoised and reconstructed transmission spectrum. Step 8: Computer 9 processes the denoised and reconstructed transmission spectrum to obtain the concentration C of carbon disulfide in the gas in gas cell 4.

[0034] Based on the same inventive concept, this invention also provides a computer device, comprising: one or more processors, and a memory for storing one or more computer programs; the programs include program instructions, and the processor executes the program instructions stored in the memory. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., serving as the computing and control core of the terminal, and is used to implement one or more instructions, specifically for loading and executing one or more instructions stored in a computer storage medium to implement the aforementioned method.

[0035] It should be further explained that, based on the same inventive concept, the present invention also provides a computer storage medium storing a computer program, which, when executed by a processor, performs the above-described method. This storage medium can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for measuring carbon disulfide concentration based on time-modulated spectral reduction, characterized in that, The method includes the following steps: A two-dimensional array of spectral intensity data and a modulation reference signal are obtained within a preset time unit. The two-dimensional array of spectral intensity data is split according to wavelength to obtain a time-varying sequence of spectral intensity for each wavelength. The average signal corresponding to the wavelength is obtained by multiplying the time-varying spectral intensity sequence of the wavelength with the modulation reference signal and then averaging the results. The average signal corresponding to the wavelength is then rearranged to obtain the transmission spectrum after the time-modulated spectrum is restored. The absorption spectral data of the transmission spectrum after time-modulated spectral reconstruction is processed to obtain the carbon disulfide spectral absorption intensity, and the carbon disulfide concentration is obtained based on the carbon disulfide spectral absorption intensity.

2. The method for measuring carbon disulfide concentration based on time-modulated spectral reduction according to claim 1, characterized in that, The time unit is set by an integer number of complete optical chopper modulation cycles.

3. The method for measuring carbon disulfide concentration based on time-modulated spectral reduction according to claim 1, characterized in that, The process of splitting the two-dimensional array of spectral intensity data by wavelength includes: The two-dimensional array of spectral intensity is divided into multiple one-dimensional arrays of single-wavelength spectral intensity changing over time according to wavelength. The number of one-dimensional arrays is equal to the number of wavelengths that can be collected. Each one-dimensional array corresponds to the time-varying sequence of spectral intensity of wavelength in the current time period.

4. The method for measuring carbon disulfide concentration based on time-modulated spectral reduction according to claim 1, characterized in that, The process of processing the absorption spectral data of the transmission spectrum after the time-modulated spectrum is restored includes: Based on Beer-Lambert's law, the absorbance of parallel light is calculated using the transmission spectrum after time-modulated spectral reconstruction and the reference transmission spectrum, and is used as the spectral absorption intensity of carbon disulfide. The absorbance of parallel light is integrated to obtain optical parameters related to the carbon disulfide concentration. The carbon disulfide concentration is then obtained by comparing the optical parameters related to the carbon disulfide concentration with the carbon disulfide concentration calibration curve.

5. The method for measuring carbon disulfide concentration based on time-modulated spectral reduction according to claim 4, characterized in that, The formula for calculating the absorbance of the parallel light is as follows: in, Indicates at wavelength The light intensity detected at that location is the transmission spectral intensity after time-modulated spectral reconstruction. Indicates at wavelength The incident light intensity at point is the transmission spectral intensity after time-modulated spectral reduction under conditions where high-purity nitrogen is filled into the gas cell.

6. The method of claim 1, wherein, The average signal corresponding to the wavelength is rearranged in order according to the wavelength.

7. A carbon disulfide concentration measurement system based on time-modulated spectral reduction, characterized in that, include: The ultraviolet broadband light emitted by the deuterium lamp (1) is modulated by the optical chopper (2) and then directed to the first lens (3). After collimation, it is directed into the gas cell (4). The light emitted from the gas cell (4) is directed through the second lens (5) and into one end of the optical fiber (6). The other end of the optical fiber (6) is connected to the optical signal receiving end of the CCD imaging spectrometer (7); The signal output terminal of the CCD imaging spectrometer (7) is connected to the data input terminal of the data acquisition card (8); The signal output terminal of the optical chopper (2) is connected to the data input terminal of the data acquisition card (8); The data output terminal of the data acquisition card (8) is connected to the computer (9); The computer (9) is used to perform the carbon disulfide concentration measurement method based on time-modulated spectral reduction as described in any one of claims 1 to 6.

8. The carbon disulfide concentration measurement system based on time-modulated spectral reduction according to claim 7, characterized in that, The ultraviolet broadband light emitted by the deuterium lamp (1) is modulated into modulated light by the optical chopper (2); the modulated light is collimated into parallel light by the first lens (3); the parallel light enters the gas cell (4), and the parallel light is absorbed by the gas in the gas cell (4), causing the spectral intensity of the parallel light to weaken and form transmitted light; the transmitted light is converged by the second lens (5) to form converged light; the converged light is incident into the CCD imaging spectrometer (7) through the optical fiber (6), and the CCD imaging spectrometer (7) splits the converged light and converts it into spectral intensities arranged in wavelength order. Two-dimensional array of data; the data acquisition card (8) synchronously acquires the spectral signal array output by the CCD imaging spectrometer (7) and the modulation reference signal output by the optical chopper (2), and receives the trigger signal issued by the optical chopper (2); the computer (9) controls the data acquisition card (8) to sample and performs time-modulated spectral restoration on the acquired signal to obtain the transmission spectrum after time-modulated spectral restoration; the computer (9) processes the transmission spectrum after time-modulated spectral restoration to obtain the carbon disulfide concentration in the gas in the gas pool (4).

9. The time-modulation spectroscopy based carbon disulfide concentration measurement system of claim 8, wherein, The deuterium lamp (1) has an emission spectrum in the 185-220 nm band, the first lens (3) and the second lens (5) are both quartz convex lenses with high ultraviolet transmittance in the 185-220 nm band, and the optical fiber (6) is a quartz optical fiber with high ultraviolet transmittance in the 185-220 nm band.

10. A terminal device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that, The memory stores a computer program that can run on a processor. When the processor loads and executes the computer program, it employs the carbon disulfide concentration measurement method based on time-modulated spectral reduction as described in any one of claims 1 to 6.

Images