Hydrogen sulfide gas detection method and device based on ultraviolet dual-wavelength correlation spectroscopy

Abstract

A hydrogen sulfide gas detection method and device based on ultraviolet dual-wavelength correlation spectroscopy relates to the field of hydrogen sulfide gas concentration detection. This method addresses the problem in the prior art of hydrogen sulfide gas detection where, when the light source fluctuates, the detected hydrogen sulfide gas concentration deviates significantly from the true value. In the hydrogen sulfide gas detection method described in the present invention, a light source emits ultraviolet light, which is injected into the gas to be detected. The parallel light beam that passes through the gas to be detected is focused by a lens and then injected into a beam splitter. The beam splitter splits the incident light into two pulsed light beams and obtains optical signals in two wavelength bands, λ1 and λ2, from each of the two pulsed light beams. The optical signals in the two wavelength bands are sent to a photoelectric conversion component. The method obtains the hydrogen sulfide gas concentration based on the two voltage signals output by the photoelectric conversion component. A detection device is implemented using the method described in the present invention. The method is suitable for the technical field of on-site hydrogen sulfide gas concentration detection.

Description

Technical Field

[0001] The present invention relates to the field of gas concentration detection, in particular to the field of hydrogen sulfide gas concentration detection. Background Art

[0002] When existing technologies use spectral analysis to detect hydrogen sulfide gas, the requirements for the light source are relatively high. When the light source fluctuates, the received light intensity will change, which in turn affects the optical parameter value. This will cause the hydrogen sulfide gas concentration obtained by using the relationship between the optical parameter and the gas concentration to deviate significantly from the actual value. Moreover, when using conventional ultraviolet spectral absorption methods to detect hydrogen sulfide gas concentration, it is first necessary to obtain its incident spectrum, which is complicated to operate and requires the detection personnel to have a certain amount of knowledge and training. A major reason restricting the development of spectroscopic methods in gas detection is that the detection cost is too high. The optical method of hydrogen sulfide gas detection requires the use of a spectrometer, which is expensive. This seriously restricts the application of optical methods in the field of hydrogen sulfide gas detection.

[0003] In summary, the existing spectral analysis technology for detecting hydrogen sulfide gas has relatively high requirements for the light source. The fluctuation of the light source will cause the detected hydrogen sulfide gas concentration to deviate from the actual value. In addition, the operation is complicated, requiring the detection personnel to have a certain amount of knowledge and skills, and the detection cost is high. Summary of the Invention

[0004] This invention provides a hydrogen sulfide gas detection method based on ultraviolet dual-wavelength correlation spectroscopy. This method addresses the existing problem of light source fluctuations causing the detected hydrogen sulfide gas concentration to deviate significantly from the true value. This method simplifies the operation steps and eliminates the need for expensive spectrometers, making the process simpler and more cost-effective.

[0005] To achieve the above object, the present invention provides the following:

[0006] A method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy, the method comprising:

[0007] The light source emits ultraviolet light, which is injected into the gas to be detected. The parallel light beam passing through the gas to be detected is focused by the lens and then injected into the beam splitting device. The beam splitting device splits the incident light into two pulse beams and obtains optical signals of two wavelength bands λ1 and λ2 from the two pulse beams respectively. The optical signals of the two wavelength bands are converted into two voltage signals V1 and V2 by the photoelectric conversion device. The optical parameter value OP is obtained according to the voltage signals V1 and V2. The hydrogen sulfide gas concentration C is obtained according to the optical parameter value OP.

[0008] Furthermore, in a preferred embodiment, the calibration curve of the optical parameter value OP and the hydrogen sulfide gas concentration C is OP=k*C+b, wherein k and b are constants, and K is not equal to 0.

[0009] A detection device implemented by the above-mentioned method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy comprises a detection optical path and a photoelectric conversion component;

[0010] The detection optical path includes a light source optical path and an optical signal processing optical path;

[0011] The light source optical path outputs a parallel light beam and injects it into the gas to be detected. The parallel light beam that passes through the gas to be detected is incident on the optical signal processing optical path as detection light; the parallel light beam is ultraviolet light;

[0012] The optical signal processing optical path includes a second lens 4 and a beam splitter. The second lens 4 focuses the incident detection light and then sends it to the beam splitter. The beam splitter converts the incident light into two pulsed light beams and filters the two pulsed light beams to obtain optical signals of two wavelength bands λ1 and λ2. The optical signals of the two wavelength bands are sent to the photoelectric conversion component.

[0013] The photoelectric conversion component converts the received optical signal into an electrical signal and outputs the electrical signal, where the electrical signal is the detection result.

[0014] Furthermore, there is a preferred embodiment in which the two bands λ1 and λ2 satisfy

[0015] Furthermore, in a preferred embodiment, the detection device further comprises a gas pool, wherein the gas pool is provided with an inlet and an outlet for the optical signal, and the gas pool is connected in series between the light source optical path and the optical signal processing optical path.

[0016] Furthermore, in a preferred embodiment, a plurality of reflectors are arranged in the gas pool, and the plurality of reflectors are used to increase the optical path of the parallel light beam inside the gas pool.

[0017] Furthermore, in a preferred embodiment, the above-mentioned detection device also includes an air pump, and the air pump is used to collect the gas to be detected into the gas pool.

[0018] Furthermore, there is a preferred embodiment, in which the above-mentioned beam splitting device includes a pulse light splitting structure and two filters (6, 8), wherein the pulse light splitting structure converts the incident light beam into two pulse light beams, and the two pulse light beams have the same frequency and opposite phases, and the two pulse light beams are respectively filtered by a filter and then sent to the photoelectric conversion component.

[0019] Furthermore, there is a preferred embodiment, the above-mentioned pulse light segmentation structure includes a driving device, a rotating mirror 5 and a reflecting mirror 9, the rotating mirror 5 is disc-shaped, and the mirror surface is evenly arranged with an even number of fan-shaped areas along the circumference, the fan-shaped areas have reflection areas and transmission areas, and the transmission areas and reflection areas are arranged alternately, and the incident light of the pulse light segmentation structure is incident on the fan-shaped areas, and the driving device is used to drive the rotating mirror to rotate at a uniform speed, and the light reflected by the reflection area is reflected by the reflecting mirror 9 and then incident on one filter, and the light projected by the projection area is incident on another filter.

[0020] Furthermore, there is a preferred embodiment, in which the above-mentioned pulse light segmentation structure includes a driving device, an oscillating mirror, and a reflector 9. The driving device drives the oscillating mirror to oscillate at a constant speed, and the incident light of the pulse light segmentation structure enters the oscillating mirror. The light reflected by the oscillating mirror is reflected by the reflector 9 and then enters a filter, and the light not reflected by the oscillating mirror enters another filter.

[0021] Technical Effects

[0022] The hydrogen sulfide gas detection method based on ultraviolet dual-wavelength correlation spectroscopy described in the present invention simplifies the operating steps and solves the problem that the detected hydrogen sulfide gas concentration has a large deviation from the actual value when the light source fluctuates.

[0023] A detection device implemented by adopting the detection method of the present invention utilizes an ultraviolet photoelectric detector to replace an expensive spectrometer, thereby reducing detection costs.

[0024] Compared with the prior art, the method has the following advantages:

[0025] 1. In the prior art, hydrogen sulfide gas content in gas is detected using chemical sensors. Optical detection techniques are usually performed in laboratories. This is because optical detection requires the use of a spectrometer, which is expensive, bulky, and has high detection costs, and cannot be performed on-site. A detection device implemented using the detection method of the present invention utilizes an ultraviolet photodetector instead of an expensive spectrometer, which can also achieve the purpose of detecting hydrogen sulfide gas. Furthermore, the ultraviolet photodetector is cheaper than a spectrometer, reducing detection costs, and is compact and easily miniaturized, making it suitable for on-site detection.

[0026] 2. Existing spectral analysis methods for hydrogen sulfide gas detection have high requirements for the light source. When the light source fluctuates, the detected hydrogen sulfide gas concentration deviates significantly from the true value. This is a major reason why optical technology for hydrogen sulfide gas detection is relatively rare in the prior art. This limitation, coupled with the lack of an effective solution, has led those skilled in the art to almost abandon research on optical methods for hydrogen sulfide gas concentration detection. The present invention utilizes ultraviolet dual-wavelength correlation spectroscopy to detect hydrogen sulfide gas, thereby completely overcoming the impact of light source fluctuations and achieving accurate hydrogen sulfide gas concentration detection.

[0027] 3. When conventional ultraviolet spectral absorption methods are used to detect hydrogen sulfide gas concentration, the incident spectrum must first be acquired. This is a complex operation and requires the detection personnel to have a certain level of knowledge and training. The detection method implemented by the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in the present invention can detect hydrogen sulfide gas concentration without acquiring the incident spectrum, simplifying the operation steps and reducing the professional requirements of the detection personnel.

[0028] The invention is suitable for the technical field of gas concentration detection, and is particularly suitable for on-site detection of hydrogen sulfide gas concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a voltage signal schematic diagram of a hydrogen sulfide gas detection method based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment 1 and embodiment 2.

[0030] Figure 2 This is a system diagram of a hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy as described in Embodiment 3, Embodiment 5, Embodiment 8 and Embodiment 9.

[0031] Figure 3 This is another structural system diagram of the beam splitting device in the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in the tenth embodiment.

[0032] Figure 4 This is the calibration curve of hydrogen sulfide gas concentration and optical parameter value described in the eleventh embodiment.

[0033] Figure 5 This is the online real-time detection curve of hydrogen sulfide gas concentration described in the eleventh embodiment.

[0034] Among them, 1 is the light source, 2 is the first lens, 3 is the gas pool, 4 is the second lens, 5 is the beam splitter, 6 is filter 1, 7 is the ultraviolet photodetector, 8 is filter 2, and 9 is the reflector. DETAILED DESCRIPTION

[0035] Implementation method 1. See Figure 1 This embodiment describes a method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy. The method is as follows:

[0036] The light source emits ultraviolet light, which is injected into the gas to be detected. The parallel light beam passing through the gas to be detected is focused by the lens and then injected into the beam splitting device. The beam splitting device splits the incident light into two pulse beams and obtains optical signals of two wavelength bands λ1 and λ2 from the two pulse beams respectively. The optical signals of the two wavelength bands are converted into two voltage signals V1 and V2 by the photoelectric conversion device. The optical parameter value OP is obtained according to the voltage signals V1 and V2. The hydrogen sulfide gas concentration C is obtained according to the optical parameter value OP.

[0037] Existing spectral analysis methods for hydrogen sulfide gas detection place high demands on the light source. When the light source fluctuates, the detected hydrogen sulfide concentration deviates significantly from the true value. This is a key reason why optical techniques for hydrogen sulfide gas detection are relatively rare in the prior art. This limitation, coupled with the lack of effective solutions, has led those skilled in the art to virtually abandon research on optical techniques for hydrogen sulfide gas concentration detection. This embodiment utilizes ultraviolet dual-wavelength correlation spectroscopy to detect hydrogen sulfide gas, completely overcoming the impact of light source fluctuations and enabling accurate hydrogen sulfide gas concentration detection.

[0038] Conventional ultraviolet spectral absorption methods for detecting hydrogen sulfide gas concentrations require first obtaining an incident spectrum, which is complex and requires personnel with sufficient knowledge and training. However, the hydrogen sulfide gas detection method based on ultraviolet dual-wavelength correlation spectroscopy described in this embodiment can detect hydrogen sulfide gas concentration without obtaining an incident spectrum, simplifying the operation and reducing the need for personnel with specialized skills.

[0039] Implementation method 2. See Figure 1 This embodiment describes the optical parameter value OP and the hydrogen sulfide gas concentration C in the hydrogen sulfide gas concentration detection method based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment one. The calibration curve of the optical parameter value OP and the hydrogen sulfide gas concentration C is OP=k*C+b, where k and b are constants, and K is not equal to 0.

[0040] In practical applications, the amplitude and average value of the electrical signal under a series of hydrogen sulfide gas concentrations are detected to obtain a series of optical parameter values, and a calibration curve OP=k*C+b of the optical parameter value OP and the hydrogen sulfide gas concentration C is obtained, where k and b are constants and K is not equal to 0.

[0041] In practical applications, two beams of light with different wavelengths enter the photoelectric conversion component and generate two voltage signals with different values, such as Figure 1 As shown, the two voltage signals of different values ​​are related to the light intensity entering the photoelectric conversion component. That is, the stronger the light intensity, the greater the voltage value. The relationship is expressed as:

[0042]

[0043]

[0044] The average value A of the voltage signal, One-half of the voltage signal amplitude B, A and B satisfy:

[0045]

[0046] According to formulas (1) and (2), we can get:

[0047] c is a constant. Taking the logarithm of both sides of formula (3) yields the optical parameter value OP:

[0048]

[0049] In practical applications, the wavelength range and experimental setup are determined, and the values ​​of σ(λ2)-σ(λ1) and L are determined.

[0050] is a constant, and it is concluded that the hydrogen sulfide gas concentration C is related to the amplitude and average value of the electrical signal generated by the photoelectric conversion component. By detecting the amplitude and average value of the electrical signal under a series of hydrogen sulfide gas concentrations, a series of optical parameter values ​​are obtained, and a calibration curve OP=k*C+b of the optical parameter value OP and the hydrogen sulfide gas concentration C is obtained, where k and b are constants and K is not equal to 0.

[0051] In practical applications, according to the Beer-Lambert law: lnI(λ)=lnI0(λ)-σ(λ)NL (5)

[0052] When selecting two different bands of the same transmission spectrum:

[0053] ln[I(λ1)]=ln[I0(λ1)]-σ(λ1)NL (6)

[0054] ln[I(λ2)]=ln[I0(λ2)]-σ(λ2)NL

[0055] When the luminous intensity of the light source fluctuates:

[0056]

[0057] The two selected bands meet the conditions:

[0058] According to formula (5) to formula (8), the optical parameter value OP is:

[0059]

[0060] From formula (9), we can conclude that the optical parameter value OP is the ratio of the transmission spectra of the two selected bands. is a fixed value. When the two selected bands are fixed, σ(λ1)-σ(λ2) is a fixed value. The experimental device is determined. By measuring the transmission spectra of the two selected bands, the optical parameter value of hydrogen sulfide gas at a certain concentration is obtained. By detecting the optical parameter values ​​under a series of hydrogen sulfide gas concentrations, the calibration curve OP of the optical parameter value OP and the hydrogen sulfide gas concentration C is obtained, OP=k*C+b, where k and b are constants and K is not equal to 0.

[0061] Implementation method three. See Figure 2 This embodiment describes a detection device implemented by the hydrogen sulfide gas detection method based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment 1. The detection device includes a detection optical path and a photoelectric conversion component; the detection optical path includes a light source optical path and an optical signal processing optical path;

[0062] The light source optical path outputs a parallel light beam and injects it into the gas to be detected. The parallel light beam that passes through the gas to be detected is incident on the optical signal processing optical path as detection light; the parallel light beam is ultraviolet light;

[0063] The optical signal processing optical path includes a second lens 4 and a beam splitter. The second lens 4 focuses the incident detection light and then sends it to the beam splitter. The beam splitter converts the incident light into two pulsed light beams and filters the two pulsed light beams to obtain optical signals of two wavelength bands λ1 and λ2. The optical signals of the two wavelength bands are sent to the photoelectric conversion component.

[0064] The photoelectric conversion component converts the received optical signal into an electrical signal and outputs the electrical signal, where the electrical signal is the detection result.

[0065] In practical applications, the photoelectric conversion component is configured as an ultraviolet photodetector, which is a photomultiplier tube. In practical applications, a deuterium lamp or a hydrogen lamp can be selected as the light source to emit ultraviolet light. Hydrogen lamps and deuterium lamps are more effective in the ultraviolet region and are moderately priced and low in cost.

[0066] In the prior art, hydrogen sulfide gas content in gas is detected using chemical sensors. Optical detection techniques are typically performed in laboratories. This is because optical detection requires a spectrometer, which is expensive, bulky, and expensive to perform, and cannot be performed on-site. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in this embodiment utilizes an ultraviolet photodetector instead of an expensive spectrometer, achieving the same goal of detecting hydrogen sulfide gas. Furthermore, the ultraviolet photodetector is less expensive than a spectrometer, reducing detection costs, and is compact and easily miniaturized, making it suitable for on-site detection.

[0067] Implementation 4. This implementation is to specifically define the two bands λ1 and λ2 in the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in Implementation 3, and the two bands λ1 and λ2 meet

[0068] In practical applications, according to the Beer-Lambert law: lnI(λ)=lnI0(λ)-σ(λ)NL (5)

[0069] When selecting two different bands of the same transmission spectrum:

[0070] ln[I(λ1)]=ln[I0(λ1)]-σ(λ1)NL (6)

[0071] ln[I(λ2)]=ln[I0(λ2)]-σ(λ2)NL

[0072] When the luminous intensity of the light source fluctuates:

[0073]

[0074]

[0075] The two selected bands meet the conditions:

[0076] This embodiment provides an optimal example, where the wavelength band λ1 is selected as 210±5 nm and the wavelength band λ2 is selected as 250±5 nm.

[0077] Existing spectral analysis methods for detecting hydrogen sulfide gas have high requirements for the light source. When the light source fluctuates, the detected hydrogen sulfide gas concentration deviates significantly from the true value. The method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy described in this embodiment is unaffected by light source fluctuations and can still detect hydrogen sulfide gas concentration without deviation from the true value.

[0078] Implementation method 5. See Figure 2 To explain this embodiment, this embodiment adds a gas pool to the detection device in the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment three, and the gas pool is provided with an inlet and an outlet for an optical signal, and the gas pool is connected in series between the light source optical path and the optical signal processing optical path.

[0079] This embodiment adds a gas pool for collecting the gas to be detected, facilitating detection.

[0080] The gas pool may adopt a closed, semi-closed or completely open structure, and the gas circulation is carried out by an air pump.

[0081] Implementation method 6. This implementation method specifically defines the gas pool in the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in implementation method 5. A plurality of reflectors are arranged in the gas pool, and the plurality of reflectors are used to increase the optical path of the parallel light beam inside the gas pool.

[0082] In practical applications, several reflectors are placed within the gas cell to increase the optical path length of the parallel light beam within the cell. This minimizes the size of the gas cell while ensuring the longest possible optical path length, allowing the light signal sufficient contact time with the gas to be detected. The small size of the gas cell also enables the design of portable products.

[0083] Embodiment 7. This embodiment is to add an air pump to the detection device of the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment 3, and the air pump is used to collect the gas to be detected into the gas pool.

[0084] This embodiment adds an air pump to achieve active control to introduce the gas to be detected into the gas pool, thereby improving the timeliness and efficiency of detection.

[0085] Implementation 8. See Figure 2 This embodiment describes the present embodiment. This embodiment specifically describes the beam splitting device in the gas detection device to be detected in the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment three. The beam splitting device includes a pulse light splitting structure and two filters (6, 8). The pulse light splitting structure converts the incident light beam into two pulse light beams, and the two pulse light beams have the same frequency and opposite phases. The two pulse light beams are respectively filtered by a filter and then sent to the photoelectric conversion component.

[0086] The two filters (6, 8) are used to filter the optical signal to obtain optical signals in wavelength bands λ1 and λ2 respectively.

[0087] The pulse light splitting structure converts the incident light beam into two pulse light beams, and then performs filtering processing on each of them to obtain light signals of two bands. In fact, it simultaneously extracts light signals of two bands in the detection light beam. The light signals of the two bands are converted into two voltage signals V1 and V2 through the photoelectric conversion device.

[0088] Implementation method nine. See Figure 2 The present embodiment is described. The present embodiment specifically describes the pulse light segmentation structure in a hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment eight. The pulse light segmentation structure includes a driving device, a rotating mirror 5 and a reflecting mirror 9. The rotating mirror 5 is disc-shaped. The mirror surface is evenly provided with an even number of sector-shaped areas along the circumference. The sector-shaped areas have reflection areas and transmission areas. The transmission areas and reflection areas are arranged alternately. The incident light of the pulse light segmentation structure is incident on the sector-shaped areas. The driving device is used to drive the rotating mirror to rotate at a uniform speed. The light reflected by the reflection area is reflected by the reflecting mirror 9 and then incident on one filter. The light projected by the projection area is incident on another filter.

[0089] In the pulse light splitting structure of this embodiment, the rotating mirror 5 and the reflecting mirror 9 are used to split the light beam into two parts. The principle is: by designing the rotating mirror 5 as follows Figure 1 In the structure shown, the reflective area and the transmissive area are arranged at intervals, so that during the rotation of the rotating mirror 5, the incident light signal can be transmitted and reflected, thereby achieving the effect of splitting the light beam into two parts.

[0090] Implementation method 10. See Figure 3 This embodiment is described as another example of the pulse light splitting structure in the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment eight. The pulse light splitting structure includes a driving device, an oscillating mirror, and a reflecting mirror 9. The driving device drives the oscillating mirror to swing at a constant speed. The incident light of the pulse light splitting structure enters the oscillating mirror. The light reflected by the oscillating mirror is reflected by the reflecting mirror 9 and then enters a filter. The light not reflected by the oscillating mirror enters another filter.

[0091] In practical applications, the pulse splitting structure can be arranged into another structure, such as Figure 3 As shown, select the appropriate pulse segmentation structure according to the actual use situation on site.

[0092] Implementation method 11. See Figure 4 and Figure 5This embodiment describes the present embodiment. This embodiment uses the hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment one to conduct a test experiment. This embodiment uses the LabVIEW platform to program a hydrogen sulfide gas real-time detection system. The system can process the collected signal data, display optical parameter values, input calibration curves, display hydrogen sulfide gas concentration online in real time, and save data files. Using the method for hydrogen sulfide gas concentration detection based on ultraviolet dual-wavelength correlation spectroscopy described in embodiment nine, a calibration curve of hydrogen sulfide gas concentration and optical parameter value is obtained on the basis of the hydrogen sulfide gas real-time detection system. Figure 4 As shown, the calibration curve of hydrogen sulfide gas concentration and optical parameter value and the hydrogen sulfide gas real-time detection system are used to obtain the online real-time detection curve of hydrogen sulfide gas concentration, as shown in FIG. Figure 5 shown.

[0093] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements within the spirit and principles of the present invention are intended to be encompassed by the claims of the present invention.

Claims

1. A method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy, characterized in that: The method is: The light source emits ultraviolet light, which is injected into the gas to be detected. The parallel light beam passing through the gas to be detected is focused by the lens and then injected into the beam splitter. The beam splitter splits the incident light into two pulse beams and obtains two bands from the two pulse beams respectively. and optical signal, two bands and satisfy The optical signals of the two wavelength bands are converted into two voltage signals V1 and V2 by the photoelectric conversion device, and the optical parameter value OP is obtained according to the voltage signals V1 and V2. , the hydrogen sulfide gas concentration C is obtained according to the optical parameter value OP.

2. The method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy according to claim 1, characterized in that: The calibration curve of the optical parameter value OP and the hydrogen sulfide gas concentration C is OP=k*C+b, wherein k and b are constants, and K is not equal to 0.

3. A hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy, characterized in that: The device is a detection device implemented by the method for detecting hydrogen sulfide gas concentration based on ultraviolet dual-wavelength correlation spectroscopy as described in claim 1, and the device includes a detection optical path and a photoelectric conversion component; The detection optical path includes a light source optical path and an optical signal processing optical path; The light source optical path outputs a parallel light beam and injects it into the gas to be detected. The parallel light beam that passes through the gas to be detected is incident on the optical signal processing optical path as detection light; the parallel light beam is ultraviolet light; The optical signal processing optical path includes a second lens (4) and a beam splitter. The second lens (4) focuses the incident detection light and then injects it into the beam splitter. The beam splitter converts the incident light into two pulse beams and filters the two pulse beams to obtain two bands. and The optical signals of the two wavelength bands are sent to the photoelectric conversion component; The photoelectric conversion component converts the received optical signal into an electrical signal for output, and the electrical signal is a detection result.

4. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy according to claim 3 is characterized in that: The detection device further comprises a gas pool, which is provided with an inlet and an outlet for an optical signal, and is connected in series between the light source optical path and the light signal processing optical path.

5. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy according to claim 4 is characterized in that: A plurality of reflectors are arranged in the gas pool, and the plurality of reflectors are used to increase the optical path of the parallel light beam inside the gas pool.

6. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy according to claim 3, characterized in that: The detection device further comprises an air pump, which is used to collect the gas to be detected and enter the gas pool.

7. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy according to claim 3 is characterized in that: The beam splitting device comprises a pulse light splitting structure and two filters (6, 8). The pulse light splitting structure converts an incident light beam into two pulse light beams, and the two pulse light beams have the same frequency and opposite phases. The two pulse light beams are respectively filtered by a filter and then sent to a photoelectric conversion component.

8. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy according to claim 7, characterized in that: The pulse light splitting structure comprises a driving device, a rotating mirror (5) and a reflecting mirror (9); the rotating mirror (5) is disc-shaped; an even number of sector-shaped regions are evenly arranged on the mirror surface of the rotating mirror (5) along the circumference; the sector-shaped regions comprise reflection regions and transmission regions; the transmission regions and the reflection regions are alternately arranged; incident light of the pulse light splitting structure is incident on the sector-shaped regions; the driving device is used to drive the rotating mirror to rotate at a uniform speed; light reflected by the reflection regions is reflected by the reflecting mirror (9) and then incident on one filter; light projected by the transmission regions is incident on another filter.

9. The hydrogen sulfide gas detection device based on ultraviolet dual-wavelength correlation spectroscopy according to claim 7, characterized in that: The pulse light splitting structure comprises a driving device, an oscillating mirror, and a reflecting mirror (9). The driving device drives the oscillating mirror to oscillate at a constant speed. The incident light of the pulse light splitting structure is incident on the oscillating mirror. The light reflected by the oscillating mirror is reflected by the reflecting mirror (9) and then incident on one filter. The light not reflected by the oscillating mirror is incident on another filter.

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