Chlorine gas long-distance detection equipment and method based on ultraviolet differential and open optical path

Abstract

The present application discloses a chlorine gas long-distance detection equipment and method based on ultraviolet differential and open optical path, which relates to the technical field of chlorine gas leakage detection, and is provided with an ultraviolet light source, an ultraviolet focusing module, a reference gas chamber module, a multi-point angle cone reflection prism array, an ultraviolet spectrometer and a processor, wherein the ultraviolet spectrometer generates a first absorption spectrum of ultraviolet light, a second absorption spectrum of collimated ultraviolet light passing through ambient gas, and a third absorption spectrum of collimated ultraviolet light passing through the chlorine gas to be measured, respectively, and the processor calculates the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain an absorption spectrum for calculation, and extracts characteristic parameters of the absorption spectrum for calculation, and compares the characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations to determine the concentration of the chlorine gas to be measured. The present application can realize simultaneous and rapid high-sensitivity detection of chlorine gas in a large range of areas.

Description

Technical Field

[0001] The present application relates to the technical field of chlorine leakage detection, and in particular to a chlorine long-distance detection device and method based on ultraviolet differential and open optical path. Background Art

[0002] Chlorine gas is highly toxic and is a major hazard source of hazardous chemicals. Its leakage detection has become a focus of industry attention, especially in the chemical industry. Conventionally, electrochemical sensors installed at fixed monitoring points are used for detection. Only sampling and detection of gases near the arranged monitoring points can be performed. Generally, higher concentrations are required for detection. There are common problems such as slow detection speed, limited distance, low sensitivity, and susceptibility to environmental interference and failure. How to achieve simultaneous, rapid, and highly sensitive detection of chlorine gas in a large area is an important safety issue in the production, storage, and use of chlorine gas. Summary of the invention

[0003] The purpose of the present application is to provide a chlorine long-distance detection device and method based on ultraviolet differential and open optical path, which can realize simultaneous, rapid and high-sensitivity detection of chlorine in a large area.

[0004] To achieve the above objectives, this application provides the following solutions.

[0005] In a first aspect, the present application provides a long-distance chlorine gas detection equipment based on ultraviolet differential and open optical path, and the long-distance chlorine gas detection equipment based on ultraviolet differential and open optical path includes: an ultraviolet light source, an ultraviolet focusing module, a reference gas chamber module, a multi-point angle cone reflection prism array, an ultraviolet spectrometer and a processor.

[0006] The ultraviolet light source is used to generate ultraviolet light and direct the ultraviolet light to the ultraviolet focusing module and the ultraviolet spectrometer.

[0007] The ultraviolet focusing module is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the reference gas chamber module and the multi-point angle pyramid reflection prism array respectively.

[0008] The reference gas chamber module is filled with ambient gas; the reference gas chamber module is used to reflect the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer.

[0009] The chlorine gas to be tested is located between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array; the multi-point angle pyramid reflection prism array is used to reflect the collimated ultraviolet light passing through the chlorine gas to be tested to the ultraviolet spectrometer.

[0010] The ultraviolet spectrometer is used to respectively generate a first absorption spectrum diagram of ultraviolet light, a second absorption spectrum diagram of collimated ultraviolet light passing through ambient gas, and a third absorption spectrum diagram of collimated ultraviolet light passing through chlorine gas to be measured.

[0011] The processor is connected to the ultraviolet spectrometer for communication; the processor is used to calculate the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain the absorption spectrum for calculation, and extract the characteristic parameters of the absorption spectrum for calculation, and compare the characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas with different concentrations to determine the concentration of the chlorine gas to be measured; wherein the characteristic parameters include the waveform, wavelength width and peak value of each absorption peak.

[0012] Optionally, the ultraviolet focusing module includes a main light path reflector, an off-axis parabolic reflector and a side light path reflector.

[0013] The main light path reflector is used to reflect the UV light to the off-axis parabolic reflector.

[0014] The off-axis parabolic reflector is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the side light path reflector or the multi-point angle pyramid reflector array.

[0015] The side light path reflector is used to reflect the collimated UV light to the reference gas cell module.

[0016] Optionally, the reference gas chamber module includes a reference gas chamber and a first ultraviolet filter and a reference gas chamber reflecting prism arranged in the reference gas chamber; the reference gas chamber is filled with ambient gas; the first ultraviolet filter is used to filter the collimated ultraviolet light and inject the filtered collimated ultraviolet light into the ambient gas; the reference gas chamber reflecting prism is used to reflect the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer.

[0017] The chlorine gas long-distance detection equipment based on ultraviolet difference and open optical path also includes: an ultraviolet filter module arranged between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array; the ultraviolet filter module includes a second ultraviolet filter; the second ultraviolet filter is used to filter the collimated ultraviolet light, and the filtered collimated ultraviolet light is incident on the multi-point angle pyramid reflection prism array.

[0018] Optionally, the multi-point corner cone reflection prism array includes multiple corner cone reflection prism arrays located at different positions; the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path also includes: a multi-point angle adjustment reflector arranged between the ultraviolet focusing module and the multi-point corner cone reflection prism array; the multi-point angle adjustment reflector is used to reflect collimated ultraviolet light to the corner cone reflection prism array at a predetermined position; wherein the corner cone reflection prism array at the predetermined position is a corner cone reflection prism array in the corner cone reflection prism arrays at different positions.

[0019] Optionally, the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path further includes: an auxiliary aiming module; the auxiliary aiming module includes an infrared light source and an aiming telescope.

[0020] The infrared light source is used to generate infrared light and direct the infrared light to the ultraviolet focusing module.

[0021] The ultraviolet focusing module is used to focus the infrared light, and the collimated infrared light obtained after focusing is incident on the multi-point angle adjustment reflector.

[0022] The multi-point angle adjustment reflector is used to reflect the collimated infrared light to the multi-point angle cone reflection prism array.

[0023] The aiming telescope is used to observe whether there is a red light spot on the multi-point angle cone reflection prism array, so as to adjust the positions of the multi-point angle adjustment reflector and the multi-point angle cone reflection prism array.

[0024] Optionally, the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path further includes: an optical fiber transmitting and receiving integrated module; the optical fiber transmitting and receiving integrated module is respectively connected to the ultraviolet light source, the ultraviolet focusing module and the ultraviolet spectrometer.

[0025] The optical fiber transmitting and receiving integrated module is used to transmit the ultraviolet light generated by the ultraviolet light source to the ultraviolet focusing module and the ultraviolet spectrometer.

[0026] The reference gas chamber reflecting prism is used to reflect the collimated ultraviolet light passing through the ambient gas to the side light path reflecting mirror; the side light path reflecting mirror is used to reflect the collimated ultraviolet light passing through the ambient gas to the off-axis parabolic reflecting mirror; the off-axis parabolic reflecting mirror is used to reflect the collimated ultraviolet light passing through the ambient gas to the main light path reflecting mirror; the main light path reflecting mirror is used to direct the collimated ultraviolet light passing through the ambient gas to the optical fiber transmitting and receiving integrated module; the optical fiber transmitting and receiving integrated module is used to direct the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer.

[0027] The multi-point angle pyramid reflection prism array is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the second ultraviolet filter; the second ultraviolet filter is used to make the collimated ultraviolet light passing through the chlorine gas to be measured incident on the off-axis parabolic reflector; the off-axis parabolic reflector is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the main light path reflector; the main light path reflector is used to make the collimated ultraviolet light passing through the chlorine gas to be measured incident on the optical fiber transmitting and receiving integrated module; the optical fiber transmitting and receiving integrated module is used to make the collimated ultraviolet light passing through the chlorine gas to be measured incident on the ultraviolet spectrometer.

[0028] Optionally, the ultraviolet filter module also includes an adjusting component, which is drivingly connected to the second ultraviolet filter; the adjusting component is used to adjust the position and angle of the second ultraviolet filter so that the reflected light of the collimated ultraviolet light incident on the second ultraviolet filter does not overlap with the optical path of the collimated ultraviolet light incident on the second ultraviolet filter and passing through the chlorine gas to be measured.

[0029] Optionally, the reference gas chamber module is filled with standard chlorine gas.

[0030] The ultraviolet light source is used to generate ultraviolet light and direct the ultraviolet light to the ultraviolet focusing module and the ultraviolet spectrometer.

[0031] The ultraviolet focusing module is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the reference gas chamber module.

[0032] The reference gas cell module is used to reflect the collimated UV light passing through the standard chlorine gas to the UV spectrometer.

[0033] The ultraviolet spectrometer is used to generate a fourth absorption spectrum diagram of ultraviolet light and a fifth absorption spectrum diagram of collimated ultraviolet light passing through standard chlorine gas, respectively.

[0034] The processor is used to calculate the fourth absorption spectrum and the fifth absorption spectrum to obtain a calibration absorption spectrum, extract characteristic parameters of the calibration absorption spectrum, compare the characteristic parameters of the calibration absorption spectrum with the characteristic parameters of a standard absorption spectrum of standard chlorine, and determine the characteristic parameter deviation caused by background noise.

[0035] In the second aspect, the present application provides a working method of a chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path, which is applied to any of the above-mentioned chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path, and the working method of the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path includes the following steps.

[0036] The first absorption spectrum, the second absorption spectrum and the third absorption spectrum are calculated to obtain a calculation absorption spectrum.

[0037] The characteristic parameters of the absorption spectrum for calculation are extracted, and the characteristic parameters of the absorption spectrum for calculation are compared with the characteristic parameters of the standard absorption spectrum of standard chlorine gas with different concentrations to determine the concentration of the chlorine gas to be measured; wherein the characteristic parameters include the waveform, wavelength width and peak value of each absorption peak.

[0038] Optionally, the first absorption spectrum, the second absorption spectrum and the third absorption spectrum are calculated to obtain an absorption spectrum for calculation, specifically including: calculating the sum of the second absorption spectrum and the third absorption spectrum, and calculating the ratio of the first absorption spectrum to the sum, to obtain the absorption spectrum for calculation; or, calculating the difference between the first absorption spectrum and the second absorption spectrum, and calculating the difference between the difference and the third absorption spectrum, to obtain the absorption spectrum for calculation.

[0039] Extracting characteristic parameters of the absorption spectrum for calculation specifically includes: extracting characteristic parameters of the absorption spectrum for calculation using a convolutional neural network.

[0040] The characteristic parameters of the absorption spectrum for calculation are compared with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations, specifically including: compensating the characteristic parameters of the absorption spectrum for calculation with the characteristic parameter deviation caused by background noise to obtain the compensated characteristic parameters of the absorption spectrum for calculation; comparing the compensated characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations.

[0041] According to the specific embodiments provided in this application, this application discloses the following technical effects.

[0042] The present application provides a chlorine gas long-distance detection equipment and method based on ultraviolet differential and open optical path, wherein an ultraviolet light source generates ultraviolet light and incidents the ultraviolet light to an ultraviolet focusing module and an ultraviolet spectrometer; the ultraviolet focusing module focuses the ultraviolet light, and incidents the collimated ultraviolet light obtained after focusing to a reference gas chamber module and a multi-point angle pyramid reflection prism array respectively; the reference gas chamber module is filled with ambient gas, and the reference gas chamber module reflects the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer; the chlorine gas to be detected is located between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array, and the multi-point angle pyramid reflection prism array The collimated ultraviolet light passing through the chlorine gas to be measured is reflected to the ultraviolet spectrometer; the ultraviolet spectrometer respectively generates a first absorption spectrum of the ultraviolet light, a second absorption spectrum of the collimated ultraviolet light passing through the ambient gas, and a third absorption spectrum of the collimated ultraviolet light passing through the chlorine gas to be measured; the processor calculates the first absorption spectrum, the second absorption spectrum, and the third absorption spectrum to obtain an absorption spectrum for calculation, extracts characteristic parameters of the absorption spectrum for calculation, compares the characteristic parameters of the absorption spectrum for calculation with characteristic parameters of standard absorption spectra of standard chlorine gas of different concentrations, and determines the concentration of the chlorine gas to be measured. The present application adopts light for detection, and light has the advantages of long propagation distance and fast propagation speed, so the detection distance and detection speed of chlorine detection can be improved to realize long-distance detection, and the chlorine concentration is subsequently determined by combining the first absorption spectrum of ultraviolet light, the second absorption spectrum of collimated ultraviolet light passing through the ambient gas, and the third absorption spectrum of collimated ultraviolet light passing through the chlorine to be detected, which can remove the influence of ambient stray light and particulate matter, improve the detection accuracy of chlorine detection, realize simultaneous, rapid and high-sensitivity detection of chlorine in a large range of areas, and solve the common problems of slow detection speed, limited distance, low sensitivity, and susceptibility to failure due to environmental interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic structural diagram of a chlorine gas long-distance detection device based on ultraviolet differential and open optical path provided in Example 1 of the present application.

[0045] Figure 2 A schematic flow chart of a working method of a chlorine gas long-distance detection device based on ultraviolet differential and open optical path provided in Example 1 of the present application.

[0046] Figure markings: 1-housing; 2-mounting bracket; 3-optical fiber transmitting and receiving integrated module; 4-ultraviolet spectrometer; 5-standard gas filling and discharge port; 6-ultraviolet light source; 7-infrared light source; 8-reference gas chamber reflecting prism; 9-ambient gas filling and discharge port; 10-reference gas chamber; 11-first ultraviolet filter; 12-off-axis parabolic reflector; 13-aiming telescope; 14-main light path reflector; 15-side light path reflector; 16-second ultraviolet filter; 17-multi-point angle adjustment reflector; 18-corner cone reflecting prism array. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Example 1.

[0049] At present, there is no long-distance open optical path detection equipment. Some studies have proposed using ultraviolet differential spectroscopy technology in the field of atmospheric monitoring to detect gases such as SO2 and NO2, but cannot achieve open optical path detection. Some studies have proposed using gas chamber ultraviolet differential spectroscopy technology to detect chlorine in a closed optical path, but cannot achieve open optical path detection. Therefore, the research on chlorine detection + ultraviolet differential + open optical path is still blank.

[0050] Based on this, this embodiment proposes a chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path, such as Figure 1 As shown, the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path includes: an ultraviolet light source 6, an ultraviolet focusing module, a reference gas chamber module, a multi-point angle pyramid reflection prism array, an ultraviolet spectrometer 4 and a processor.

[0051] The ultraviolet light source 6 is used to generate ultraviolet light and transmit the ultraviolet light to the ultraviolet focusing module and the ultraviolet spectrometer 4 .

[0052] The ultraviolet focusing module is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the reference gas chamber module and the multi-point angle pyramid reflection prism array respectively.

[0053] The reference gas chamber module is filled with ambient gas, and is used to reflect the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer 4 .

[0054] The chlorine gas to be measured is located between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array, and the multi-point angle pyramid reflection prism array is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the ultraviolet spectrometer 4.

[0055] The ultraviolet spectrometer 4 is used to respectively generate a first absorption spectrum of ultraviolet light, a second absorption spectrum of collimated ultraviolet light passing through ambient gas, and a third absorption spectrum of collimated ultraviolet light passing through the chlorine gas to be measured.

[0056] The processor is connected to the ultraviolet spectrometer 4 for communication. The processor is used to calculate the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain the absorption spectrum for calculation, extract the characteristic parameters of the absorption spectrum for calculation, compare the characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas with different concentrations, and determine the concentration of the chlorine gas to be measured. The characteristic parameters include the waveform, wavelength width and peak value of each absorption peak.

[0057] This embodiment adopts an open optical path, and the collimated ultraviolet light emitted by the ultraviolet focusing module is incident on the reference gas chamber module and the multi-point angle cone reflection prism array respectively, so as to detect the ambient gas and the chlorine gas to be detected respectively. Since light is used for detection, light has the advantages of long propagation distance and fast propagation speed, so the detection distance and detection speed of chlorine detection can be improved to achieve long-distance detection, and the chlorine concentration is subsequently determined by combining the first absorption spectrum of ultraviolet light, the second absorption spectrum of collimated ultraviolet light passing through the ambient gas, and the third absorption spectrum of collimated ultraviolet light passing through the chlorine gas to be detected. The influence of ambient stray light and particulate matter can be removed based on ultraviolet differential, the detection accuracy of chlorine detection can be improved, and simultaneous, rapid and high-sensitivity detection of chlorine in a large range of areas can be achieved, so as to solve the common problems of slow detection speed, limited distance, low sensitivity, and susceptibility to failure due to environmental interference.

[0058] In this embodiment, the ultraviolet light source 6 adopts a flash xenon lamp, which generates pulsed ultraviolet light at a high frequency of 1 to 1000 times / minute, and the output optical power is not less than 100MW, and covers the wavelength range from ultraviolet light to visible light, and the wavelength range is 220nm to 2200nm. When chlorine is detected, the wavelength range of the ultraviolet light source 6 is selected to be 200nm to 400nm.

[0059] In this embodiment, the ultraviolet focusing module includes a main light path reflector 14 , an off-axis parabolic reflector 12 and a side light path reflector 15 .

[0060] The main light path reflector 14 is used to reflect the ultraviolet light to the off-axis parabolic reflector 12 .

[0061] The off-axis parabolic reflector 12 is used to focus the ultraviolet light, and direct the collimated ultraviolet light obtained after focusing to the side light path reflector 15 or the multi-point angle pyramid reflector array.

[0062] The side light path reflector 15 is used to reflect the collimated ultraviolet light to the reference gas chamber module.

[0063] The ultraviolet light emitted by the ultraviolet light source 6 is reflected by the main light path reflector 14 to the off-axis parabolic reflector 12, and is gathered near the focus of the off-axis parabolic reflector 12 to be collimated and parallel collimated ultraviolet light before being emitted. When it is necessary to detect the environmental gas, the side light path reflector 15 is moved between the off-axis parabolic reflector 12 and the multi-point angle pyramid reflector array, and the off-axis parabolic reflector 12 directly incidents the collimated ultraviolet light to the side light path reflector 15, and the side light path reflector 15 reflects the collimated ultraviolet light to the reference gas chamber module. When it is necessary to detect the chlorine gas to be detected, the off-axis parabolic reflector 12 directly incidents the collimated ultraviolet light to the multi-point angle pyramid reflector array.

[0064] The off-axis parabolic reflector 12 is coated with UV-enhanced aluminum film, has an off-axis angle of 0-30°, a focal length of 300-1000 mm, and a diameter of 100-400 mm. The side light path reflector 15 is a 45° plane reflector with a diameter of 10-100 mm.

[0065] In this embodiment, the reference gas chamber module includes a reference gas chamber 10 , a first ultraviolet filter 11 and a reference gas chamber reflecting prism 8 disposed in the reference gas chamber 10 .

[0066] The reference gas chamber 10 is filled with ambient gas.

[0067] The first ultraviolet filter 11 is used to filter the collimated ultraviolet light and inject the filtered collimated ultraviolet light into the ambient gas.

[0068] The reference gas chamber reflecting prism 8 is used to reflect the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer 4 .

[0069] When the reference gas chamber module is actually detecting chlorine, it detects in real time the interference of stray light or particulate matter in the environment on the absorption spectrum and intensity of chlorine. At this time, the collimated ultraviolet light emitted from the off-axis parabolic reflector 12 is incident on the side light path reflector 15, deflected 90° and reflected to the reference gas chamber 10. A first ultraviolet filter 11 with a light transmission wavelength range of 180nm to 550nm is installed at the inlet of the reference gas chamber 10. After being filtered by the first ultraviolet filter 11, the collimated ultraviolet light is incident on the ambient gas in the reference gas chamber 10. Under the action of the reference gas chamber reflection prism 8, the collimated ultraviolet light is reflected once or multiple times in the reference gas chamber 10, and the collimated ultraviolet light passing through the ambient gas is reflected to the ultraviolet spectrometer 4.

[0070] The concentration measurement of this embodiment is based on the Lambert-Beer law, which is a law describing the relationship between the strength of a substance's absorption of a certain wavelength of light and the concentration of the absorbing substance and the thickness of its liquid layer. Since the physical length of the reference gas chamber 10 is fixed, if the collimated ultraviolet light is only transmitted once in the reference gas chamber 10, the attenuation effect will be relatively small. Therefore, this embodiment sets a reference gas chamber reflection prism 8. By adjusting the position of the reference gas chamber reflection prism 8, the collimated ultraviolet light is emitted after a single or multiple reflections in the reference gas chamber 10, which can increase the attenuation effect and reduce the error. Specifically, the reference gas chamber reflection prism 8 can be set at the bottom of the reference gas chamber 10.

[0071] In this embodiment, the chlorine gas long-distance detection equipment based on ultraviolet difference and open optical path also includes: an ultraviolet filter module arranged between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array, the ultraviolet filter module includes a second ultraviolet filter 16, the second ultraviolet filter 16 is a filter, located between the off-axis parabolic reflector 12 and the collimated ultraviolet light outlet, and the light transmission wavelength range is 180nm to 550nm. The second ultraviolet filter 16 is used to filter the collimated ultraviolet light, and the filtered collimated ultraviolet light is incident on the multi-point angle pyramid reflection prism array.

[0072] In this embodiment, the multi-point corner cube reflection prism array includes a plurality of corner cube reflection prism arrays 18 located at different positions. The corner cube reflection prism array 18 is an array composed of a plurality of corner cube prisms. In order to detect chlorine at different positions, that is, to realize the detection of chlorine at multiple positions, in this embodiment, the chlorine long-distance detection equipment based on ultraviolet differential and open optical path also includes: a multi-point angle adjustment reflector 17 arranged between the ultraviolet focusing module and the multi-point corner cone reflection prism array. When the ultraviolet filter module is provided, a multi-point angle adjustment reflector 17 for accurate and automatic rotation adjustment of the angle is added at any position between the ultraviolet filter module and the multi-point corner cone reflection prism array. The multi-point angle adjustment reflector 17 adjusts its own angle to reflect the collimated ultraviolet light to the corner cone reflection prism array 18 at a predetermined position. The corner cone reflection prism array 18 at the predetermined position is one of the corner cone reflection prism arrays 18 at different positions, that is, the emitted collimated ultraviolet light is refracted at a certain angle to reach different corner cone reflection prism arrays 18, thereby realizing the measurement of chlorine concentration at multiple points in space.

[0073] Preferably, the chlorine gas to be measured is between the multi-point angle-adjustable reflector 17 and the multi-point angle-cone reflector array, and the average concentration of the chlorine gas to be measured between the two can be measured.

[0074] In this embodiment, the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path also includes: an optical fiber transmitting and receiving integrated module 3, and the optical fiber transmitting and receiving integrated module 3 is respectively connected to the ultraviolet light source 6, the ultraviolet focusing module and the ultraviolet spectrometer 4. The optical fiber transmitting and receiving integrated module 3 can use a 7-core Y-type optical fiber, wherein the central Y-type optical fiber uses an anti-ultraviolet optical fiber with a diameter of 100-400 μm, which is the central receiving optical fiber, and the 6 peripheral Y-type optical fibers are transmitting optical fibers, and the peripheral transmitting optical fibers are evenly distributed in a circular ring, and the distance from the center of the circle to the center of the central receiving optical fiber ranges from 200 to 2000 μm.

[0075] The optical fiber transmitting and receiving integrated module 3 is used to transmit the ultraviolet light generated by the ultraviolet light source 6 to the ultraviolet focusing module and the ultraviolet spectrometer 4. At this time, the ultraviolet light generated by the ultraviolet light source 6 is emitted after being coupled by the optical fiber.

[0076] The reference air chamber reflection prism 8 is used to reflect the collimated ultraviolet light passing through the ambient gas to the side light path reflector 15, the side light path reflector 15 is used to reflect the collimated ultraviolet light passing through the ambient gas to the off-axis parabolic reflector 12, the off-axis parabolic reflector 12 is used to reflect the collimated ultraviolet light passing through the ambient gas to the main light path reflector 14, the main light path reflector 14 is used to incident the collimated ultraviolet light passing through the ambient gas to the optical fiber transmitting and receiving integrated module 3, and the optical fiber transmitting and receiving integrated module 3 is used to incident the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer 4. At this time, the collimated ultraviolet light passing through the ambient gas emitted by the reference air chamber reflection prism 8 is reflected to the side light path reflector 15, and after being reflected again by the side light path reflector 15 and the off-axis parabolic reflector 12, it enters the optical fiber transmitting and receiving integrated module 3, and is coupled by the central receiving optical fiber of the optical fiber transmitting and receiving integrated module 3 to the ultraviolet spectrometer 4, eliminating external environmental interference.

[0077] The multi-point angle pyramid reflection prism array is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the second ultraviolet filter 16, the second ultraviolet filter 16 is used to direct the collimated ultraviolet light passing through the chlorine gas to be measured to the off-axis parabolic reflector 12, the off-axis parabolic reflector 12 is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the main light path reflector 14, the main light path reflector 14 is used to direct the collimated ultraviolet light passing through the chlorine gas to be measured to the optical fiber transmitting and receiving integrated module 3, the optical fiber transmitting and receiving integrated module 3 is used to direct the collimated ultraviolet light passing through the chlorine gas to be measured to the ultraviolet spectrometer 4. At this time, the collimated ultraviolet light emitted by the off-axis parabolic reflector 12 is filtered by the ultraviolet filter module, reaches the far-end corner cone reflection prism array 18, is reflected back, and then passes through the ultraviolet filter module to be focused at the off-axis parabolic reflector 12. The focused collimated ultraviolet light that passes through the chlorine gas to be measured is reflected by the main light path reflector 14, and is coupled by the central receiving optical fiber of the optical fiber transmitting and receiving integrated module 3 to the ultraviolet spectrometer 4.

[0078] In this embodiment, the ultraviolet filter module also includes an adjusting component, which is drivingly connected to the second ultraviolet filter 16, and the adjusting component is used to adjust the position and angle of the second ultraviolet filter 16 so that the reflected light of the collimated ultraviolet light incident on the second ultraviolet filter 16 does not overlap with the optical path of the collimated ultraviolet light passing through the chlorine gas to be measured and incident on the second ultraviolet filter 16.

[0079] In order to reduce the length of the equipment and provide the ability to adjust the position of the light source, the second UV filter 16 is fixed on a 3-DOF adjustment platform, which has the ability to adjust two tilt angles and the ability to adjust the front and rear translation. Figure 1The xz plane is shown. The two tilt angle adjustment capabilities provided in this embodiment are the angle adjustment capability of the xz plane and the angle adjustment capability of the yz plane, which are equivalent to changing the 3-DOF coordinate position of the light-emitting point, and the angle adjustment range is between 0 and 30°. The reason why the adjustment capability is provided in this embodiment is that the actual focal length of the off-axis parabolic reflector 12 has a ±1% allowable error, and the optimal light-emitting position is not exactly at the focus. Since the collimated ultraviolet light emitted by the off-axis parabolic reflector 12 will be reflected and transmitted at the second ultraviolet filter 16, in order to prevent the reflected light (about 5% light intensity) of the collimated ultraviolet light emitted at the second ultraviolet filter 16 from interfering with the collimated ultraviolet light reflected to the second ultraviolet filter 16 and passing through the chlorine gas to be measured, after the second ultraviolet filter 16 is adjusted to a certain angle, the reflected light will deviate.

[0080] In this embodiment, the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path also includes: an auxiliary aiming module, the auxiliary aiming module includes an infrared light source 7 and an aiming telescope 13, and the infrared light source 7 is connected to the optical fiber transmitting and receiving integrated module 3.

[0081] The infrared light source 7 is used to generate infrared light and direct the infrared light into the ultraviolet focusing module.

[0082] The ultraviolet focusing module is used to focus the infrared light, and the collimated infrared light obtained after focusing is incident on the multi-point angle adjustment reflector 17 .

[0083] The multi-point angle adjustment reflector 17 is used to reflect the collimated infrared light to the multi-point angle cone reflection prism array.

[0084] The aiming telescope 13 is used to observe whether there is a red light spot on the multi-point angle pyramid reflection prism array, so as to adjust the positions of the multi-point angle adjustment reflector 17 and the multi-point angle pyramid reflection prism array so that the light path can be correctly propagated.

[0085] The auxiliary aiming module includes an auxiliary infrared light source 7 and an aiming telescope 13. The infrared light emitted by the infrared light source 7 is a visible laser. The infrared light source 7 can be a red laser emitter, and the output optical power is not less than 100MW. After the equipment is installed and before the equipment starts working, the ultraviolet light source 6 is switched to the infrared light source 7, so that the red light spot is visible at the position of the multi-point angle cone reflection prism array. The multi-point angle adjustment reflector 17 and the multi-point angle cone reflection prism array are installed and fixed according to the position of the red light spot, which greatly reduces the difficulty of aiming. The aiming telescope 13 is used to observe the position of the red light spot in the distance and assist in adjusting the posture so that the red light spot is projected to the predetermined area. When an ultraviolet filter module is provided, the auxiliary aiming module can also adjust the position of the second ultraviolet filter 16 at the same time so that the optical path meets the requirements.

[0086] The reference gas chamber module uses environmental gas to eliminate environmental interference on the one hand, and uses standard gas (i.e., standard chlorine gas) to calibrate the equipment measurement accuracy on the other hand. Therefore, the reference gas chamber module includes a standard gas filling and discharge port 5 and an environmental gas filling and discharge port 9. The standard gas filling and discharge port 5 is used to fill the reference gas chamber 10 with standard chlorine gas or discharge the standard chlorine gas in the reference gas chamber 10, and the environmental gas filling and discharge port 9 is used to fill the reference gas chamber 10 with environmental gas or discharge the environmental gas in the reference gas chamber 10.

[0087] During calibration, the reference gas cell module is filled with standard chlorine gas.

[0088] The ultraviolet light source 6 is used to generate ultraviolet light and transmit the ultraviolet light to the ultraviolet focusing module and the ultraviolet spectrometer 4 .

[0089] The ultraviolet focusing module is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the reference gas chamber module.

[0090] The reference gas chamber module is used to reflect the collimated ultraviolet light passing through the standard chlorine gas to the ultraviolet spectrometer 4 .

[0091] The ultraviolet spectrometer 4 is used to generate a fourth absorption spectrum diagram of ultraviolet light and a fifth absorption spectrum diagram of collimated ultraviolet light passing through standard chlorine gas.

[0092] The processor is used to calculate the fourth absorption spectrum and the fifth absorption spectrum to obtain a calibration absorption spectrum, extract characteristic parameters of the calibration absorption spectrum, compare the characteristic parameters of the calibration absorption spectrum with the characteristic parameters of a standard absorption spectrum of standard chlorine, and determine the characteristic parameter deviation caused by background noise.

[0093] For each concentration of standard chlorine gas, the above process is executed to calculate the difference between the characteristic parameters of the calibration absorption spectrum and the characteristic parameters of the standard absorption spectrum of standard chlorine gas to obtain the characteristic parameter deviation of each concentration of standard chlorine gas, and calculate the average value of the characteristic parameter deviation of each concentration of standard chlorine gas to obtain the final characteristic parameter deviation caused by background noise.

[0094] In this embodiment, the measurement range of the ultraviolet spectrometer 4 is 150-500 nm, and the spectral resolution is not higher than 5 nm. The first absorption spectrum, the second absorption spectrum, the third absorption spectrum, the fourth absorption spectrum, the fifth absorption spectrum and the standard absorption spectrum are all peak intensities corresponding to different wavelengths, and the peak intensity can also be called the absorption cross-sectional area, and the unit is the amount of chlorine gas per unit area and per unit mole.

[0095] The ultraviolet light source 6 emits ultraviolet light in a specific range, and measures the intensity and waveform signal of the ultraviolet light before emission, the intensity and waveform signal of the collimated ultraviolet light passing through the ambient gas after the ultraviolet light in the reference optical path is absorbed by the ambient gas after emission, and the intensity and waveform signal of the collimated ultraviolet light passing through the chlorine gas to be measured after the ultraviolet light in the open optical path is absorbed by the chlorine gas to be measured, respectively, to obtain a first absorption spectrum diagram, a second absorption spectrum diagram and a third absorption spectrum diagram, eliminate interference from ambient stray light and particulate matter, and use a convolutional neural network to invert the chlorine concentration to ensure high-precision inversion of the chlorine concentration.

[0096] The processor (also known as the data storage processing module) is used to complete the extraction and storage of characteristic parameters of the ultraviolet absorption spectrum. Standard chlorine of different concentrations is used in advance. The correlation between the characteristic parameters and the chlorine concentration is calibrated based on the experiment. The concentration inversion is performed based on the convolutional neural network + image recognition method. Specifically, the standard absorption spectra of standard chlorine of different concentrations are obtained through experiments, and the characteristic parameters of the standard absorption spectrum, that is, the waveform, wavelength width (that is, the range of wavelengths covered by the absorption peak), peak value, etc. of each absorption peak are extracted through the convolutional neural network. The characteristic parameters of the standard absorption spectrum of standard chlorine of different concentrations are calibrated, and the characteristic parameters of the collected absorption spectrum for calculation are extracted through the convolutional neural network, and compared with the characteristic parameters of the standard absorption spectrum of standard chlorine of different concentrations, so as to realize concentration inversion.

[0097] The working method of the equipment of this embodiment is the key to ensure long-distance, high-precision and rapid measurement of chlorine gas leakage. The core of this working method is to first calibrate the background noise law and correlation of the equipment through standard chlorine gas of different concentrations, on the one hand, eliminate the influence of background noise by subtraction to calibrate to zero, and on the other hand, establish the correlation between characteristic parameters and chlorine concentration. Then, when measuring under the actual open optical path, the ultraviolet light is reflected and received by the multi-point angle cone reflection prism array to obtain the third absorption spectrum, and by adjusting the side light path reflector 15, the measured atmospheric environment gas is extracted with the reference gas chamber 10, and the influence of particulate matter in the atmospheric environment gas on the measurement intensity is measured synchronously to obtain the second absorption spectrum, eliminate the interference of environmental particulate matter, and use the convolutional neural network + image recognition method to achieve high-precision inversion of chlorine concentration, with a minimum sensitivity of no more than 30ppb.

[0098] When measuring the chlorine concentration, since particulate matter in the atmosphere interferes with the absorption spectrum and intensity of chlorine, it is necessary to switch the ultraviolet light to the reference gas chamber 10 regularly, such as at intervals of 30 seconds, to measure the influence of the ambient particulate matter content.

[0099] This embodiment specifically designs a chlorine gas leak detection equipment with a long distance of 200m and a minimum sensitivity of 30ppb. The frequency of the ultraviolet light source 6 reaches 1 to 600 times / min, the output light power is 100 to 1000MW, the wavelength range is 200nm to 2000nm, the central receiving optical fiber diameter of the optical fiber transmitting and receiving integrated module 3 is 100 to 300μm, the distance from the center of the peripheral transmitting optical fiber to the center of the central receiving optical fiber is 200 to 1800μm, the off-axis angle of the off-axis parabolic reflector 12 is 0 to 25°, and the focal length is 300~800mm, diameter is 100~300mm, the side light path reflector 15 adopts a 45° plane reflector with a diameter of 0~50mm, the transmittance wavelength range of the first ultraviolet filter 11 is 200nm to 500nm, the transmittance wavelength range of the second ultraviolet filter 16 is 200nm to 500nm, the angle adjustment range is between 0~20°, the measurement range of the ultraviolet spectrometer 4 is 150~500nm, the spectral resolution is not higher than 3nm, and the output optical power of the infrared light source 7 is 400~1000MW.

[0100] In this embodiment, the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path also includes: a shell 1 and a mounting bracket 2, the ultraviolet focusing module and the ultraviolet filtering module are both located inside the shell 1, the mounting bracket 2 is used to support the shell 1, the ultraviolet light source 6 and the reference gas chamber module are located at the bottom of the shell 1, and the aiming telescope 13 is located at the top of the shell 1.

[0101] Aiming at the field of safety risk monitoring and early warning of hazardous chemicals, this embodiment has developed a long-distance detection equipment for chlorine leakage based on ultraviolet differential and open optical path, which uses special designs such as high-frequency pulsed ultraviolet light source and ultraviolet focusing module, reference optical path (by using reference gas chamber 10 to extract atmospheric environment gas at the monitoring position in real time, and measure the influence of particulate matter on the absorption spectrum of chlorine in a closed environment), precision spectrometry (composed of a multi-point angle-adjustable reflector 17 and a multi-point angle cone reflection prism array to achieve precise focusing at multiple measurement positions), noise reduction analysis algorithm (subtraction to eliminate the influence of background noise to calibrate zero) and concentration inversion method (correlation between characteristic parameters and chlorine concentration) to achieve high-precision quantitative perception and early warning of long-distance chlorine leakage, and can achieve high-precision measurement and rapid early warning of chlorine concentration at ppb level over a long distance of more than 200m, effectively solving the problems of slow measurement of highly toxic chlorine media, high risk of close-range measurement by personnel, and insufficient measurement accuracy of existing electrochemical / catalytic combustion methods, and supporting risk early warning and safety control of the entire chain of chlorine production, storage and utilization.

[0102] Example 2.

[0103] This embodiment provides a working method of a chlorine gas long-distance detection device based on ultraviolet differential and open optical path, which is applied to a chlorine gas long-distance detection device based on ultraviolet differential and open optical path described in Example 1, such as Figure 2 As shown, the working method of the chlorine gas long-distance detection equipment based on ultraviolet difference and open optical path includes the following steps.

[0104] S1: Calculate the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain an absorption spectrum for calculation.

[0105] S2: extracting characteristic parameters of the absorption spectrum for calculation, and comparing the characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations to determine the concentration of the chlorine gas to be measured; wherein the characteristic parameters include the waveform, wavelength width and peak value of each absorption peak.

[0106] The first absorption spectrum, the second absorption spectrum and the third absorption spectrum are calculated to obtain an absorption spectrum for calculation, specifically including: calculating the sum of the second absorption spectrum and the third absorption spectrum, and calculating the ratio of the first absorption spectrum to the sum, to obtain the absorption spectrum for calculation; or calculating the difference between the first absorption spectrum and the second absorption spectrum, and calculating the difference between the difference and the third absorption spectrum, to obtain the absorption spectrum for calculation.

[0107] The step of extracting characteristic parameters of the absorption spectrum for calculation specifically includes: extracting characteristic parameters of the absorption spectrum for calculation using a convolutional neural network.

[0108] Among them, the characteristic parameters of the absorption spectrum for calculation are compared with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations, specifically including: compensating the characteristic parameters of the absorption spectrum for calculation with the characteristic parameter deviation caused by background noise to obtain the compensated characteristic parameters of the absorption spectrum for calculation; comparing the compensated characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations.

[0109] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path, characterized in that: The chlorine gas long-distance detection equipment based on ultraviolet difference and open optical path includes: an ultraviolet light source, an ultraviolet focusing module, a reference gas chamber module, a multi-point angle pyramid reflection prism array, an ultraviolet spectrometer and a processor; The ultraviolet light source is used to generate ultraviolet light and transmit the ultraviolet light to the ultraviolet focusing module and the ultraviolet spectrometer; The ultraviolet focusing module is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the reference gas chamber module and the multi-point angle pyramid reflection prism array respectively; The reference gas chamber module is filled with ambient gas; the reference gas chamber module is used to reflect the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer; The chlorine gas to be measured is located between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array; the multi-point angle pyramid reflection prism array is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the ultraviolet spectrometer; The ultraviolet spectrometer is used to respectively generate a first absorption spectrum of ultraviolet light, a second absorption spectrum of collimated ultraviolet light passing through ambient gas, and a third absorption spectrum of collimated ultraviolet light passing through chlorine gas to be measured; The processor is connected to the ultraviolet spectrometer for communication; the processor is used to calculate the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain the absorption spectrum for calculation, and extract the characteristic parameters of the absorption spectrum for calculation, and compare the characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas with different concentrations to determine the concentration of the chlorine gas to be measured; wherein the characteristic parameters include the waveform, wavelength width and peak value of each absorption peak.

2. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 1 is characterized in that: The ultraviolet focusing module includes a main light path reflector, an off-axis parabolic reflector and a side light path reflector; The main light path reflector is used to reflect the ultraviolet light to the off-axis parabolic reflector; The off-axis parabolic reflector is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the side light path reflector or the multi-point angle pyramid reflector array; The side light path reflector is used to reflect the collimated UV light to the reference gas cell module.

3. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 2 is characterized in that: The reference gas chamber module includes a reference gas chamber, a first ultraviolet filter and a reference gas chamber reflection prism arranged in the reference gas chamber; the reference gas chamber is filled with ambient gas; the first ultraviolet filter is used to filter the collimated ultraviolet light and inject the filtered collimated ultraviolet light into the ambient gas; the reference gas chamber reflection prism is used to reflect the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer; The chlorine gas long-distance detection equipment based on ultraviolet difference and open optical path also includes: an ultraviolet filter module arranged between the ultraviolet focusing module and the multi-point angle pyramid reflection prism array; the ultraviolet filter module includes a second ultraviolet filter; the second ultraviolet filter is used to filter the collimated ultraviolet light, and the filtered collimated ultraviolet light is incident on the multi-point angle pyramid reflection prism array.

4. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 1 is characterized in that: The multi-point corner cone reflection prism array includes a plurality of corner cone reflection prism arrays located at different positions; the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path also includes: a multi-point angle adjustment reflector arranged between the ultraviolet focusing module and the multi-point corner cone reflection prism array; the multi-point angle adjustment reflector is used to reflect the collimated ultraviolet light to the corner cone reflection prism array at a predetermined position; wherein the corner cone reflection prism array at the predetermined position is a corner cone reflection prism array in the corner cone reflection prism arrays at different positions.

5. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 4 is characterized in that: The chlorine gas long-distance detection equipment based on ultraviolet difference and open optical path also includes: an auxiliary aiming module; the auxiliary aiming module includes an infrared light source and an aiming telescope; The infrared light source is used to generate infrared light and direct the infrared light into the ultraviolet focusing module; The ultraviolet focusing module is used to focus the infrared light, and the collimated infrared light obtained after focusing is incident on the multi-point angle adjustment reflector; The multi-point angle-adjustable reflector is used to reflect the collimated infrared light to the multi-point angle-cone reflector array; The aiming telescope is used to observe whether there is a red light spot on the multi-point angle cone reflection prism array, so as to adjust the positions of the multi-point angle adjustment reflector and the multi-point angle cone reflection prism array.

6. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 3, characterized in that: The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path also includes: an optical fiber transmitting and receiving integrated module; the optical fiber transmitting and receiving integrated module is respectively connected to the ultraviolet light source, the ultraviolet focusing module and the ultraviolet spectrometer; The optical fiber transmitting and receiving integrated module is used to transmit the ultraviolet light generated by the ultraviolet light source to the ultraviolet focusing module and the ultraviolet spectrometer; The reference gas chamber reflection prism is used to reflect the collimated ultraviolet light passing through the ambient gas to the side light path reflector; the side light path reflector is used to reflect the collimated ultraviolet light passing through the ambient gas to the off-axis parabolic reflector; the off-axis parabolic reflector is used to reflect the collimated ultraviolet light passing through the ambient gas to the main light path reflector; the main light path reflector is used to direct the collimated ultraviolet light passing through the ambient gas to the optical fiber transmitting and receiving integrated module; the optical fiber transmitting and receiving integrated module is used to direct the collimated ultraviolet light passing through the ambient gas to the ultraviolet spectrometer; The multi-point angle pyramid reflection prism array is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the second ultraviolet filter; the second ultraviolet filter is used to make the collimated ultraviolet light passing through the chlorine gas to be measured incident on the off-axis parabolic reflector; the off-axis parabolic reflector is used to reflect the collimated ultraviolet light passing through the chlorine gas to be measured to the main light path reflector; the main light path reflector is used to make the collimated ultraviolet light passing through the chlorine gas to be measured incident on the optical fiber transmitting and receiving integrated module; the optical fiber transmitting and receiving integrated module is used to make the collimated ultraviolet light passing through the chlorine gas to be measured incident on the ultraviolet spectrometer.

7. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 6, characterized in that: The ultraviolet filter module also includes an adjusting component, which is drivingly connected to the second ultraviolet filter; the adjusting component is used to adjust the position and angle of the second ultraviolet filter so that the reflected light of the collimated ultraviolet light incident on the second ultraviolet filter does not overlap with the optical path of the collimated ultraviolet light incident on the second ultraviolet filter and passing through the chlorine to be measured.

8. The chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 1, characterized in that: The reference gas chamber module is filled with standard chlorine gas; The ultraviolet light source is used to generate ultraviolet light and transmit the ultraviolet light to the ultraviolet focusing module and the ultraviolet spectrometer; The ultraviolet focusing module is used to focus the ultraviolet light, and the collimated ultraviolet light obtained after focusing is incident on the reference gas chamber module; The reference gas chamber module is used to reflect the collimated ultraviolet light passing through the standard chlorine gas to the ultraviolet spectrometer; The ultraviolet spectrometer is used to generate a fourth absorption spectrum diagram of ultraviolet light and a fifth absorption spectrum diagram of collimated ultraviolet light passing through standard chlorine gas, respectively; The processor is used to calculate the fourth absorption spectrum and the fifth absorption spectrum to obtain a calibration absorption spectrum, extract characteristic parameters of the calibration absorption spectrum, compare the characteristic parameters of the calibration absorption spectrum with the characteristic parameters of a standard absorption spectrum of standard chlorine, and determine the characteristic parameter deviation caused by background noise.

9. A working method of a chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path, applied to the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path as claimed in any one of claims 1 to 8, characterized in that: The working method of the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path includes: Calculating the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain a calculation absorption spectrum; The characteristic parameters of the absorption spectrum for calculation are extracted, and the characteristic parameters of the absorption spectrum for calculation are compared with the characteristic parameters of the standard absorption spectrum of standard chlorine gas with different concentrations to determine the concentration of the chlorine gas to be measured; wherein the characteristic parameters include the waveform, wavelength width and peak value of each absorption peak.

10. The working method of the chlorine gas long-distance detection equipment based on ultraviolet differential and open optical path according to claim 9 is characterized in that: Calculating the first absorption spectrum, the second absorption spectrum and the third absorption spectrum to obtain an absorption spectrum for calculation, specifically comprising: calculating the sum of the second absorption spectrum and the third absorption spectrum, and calculating the ratio of the first absorption spectrum to the sum, to obtain the absorption spectrum for calculation; or calculating the difference between the first absorption spectrum and the second absorption spectrum, and calculating the difference between the difference and the third absorption spectrum, to obtain the absorption spectrum for calculation; Extracting characteristic parameters of the absorption spectrum for calculation, specifically including: extracting characteristic parameters of the absorption spectrum for calculation using a convolutional neural network; The characteristic parameters of the absorption spectrum for calculation are compared with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations, specifically including: compensating the characteristic parameters of the absorption spectrum for calculation with the characteristic parameter deviation caused by background noise to obtain the compensated characteristic parameters of the absorption spectrum for calculation; comparing the compensated characteristic parameters of the absorption spectrum for calculation with the characteristic parameters of the standard absorption spectrum of standard chlorine gas of different concentrations.

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