A composite optical detector based on ultraviolet differential absorption spectroscopy and microfluidic infrared technology

Abstract

The present invention discloses a composite optical detector based on ultraviolet differential absorption spectroscopy and microflow infrared technology, comprising: a first measuring chamber, which is mainly used to contain measurement gas, and the structure of the first measuring chamber is a transparent structure; a spectrometer, which is arranged on the right side of the first measuring chamber; a sample gas chamber, which is installed at the front end of the first measuring chamber, and the structure of the sample gas chamber is a transparent structure; an air inlet and outlet, which are connected between the first measuring chamber and the sample gas chamber, and the air inlet and outlet are mainly used to charge and discharge sample gas into and out of the first measuring chamber and the sample gas chamber; a second light source, which is installed on the left side of the second measuring chamber, and the second light source is an infrared band light; a reference gas chamber, which is installed at the right end of the second measuring chamber. The composite optical detector based on ultraviolet differential absorption spectroscopy and microflow infrared technology can perform measurement and analysis on the sample gas in different bands, thereby improving the comprehensive measurement capability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection devices, in particular to a composite optical detector based on ultraviolet differential absorption spectroscopy and micro-flow infrared technology. Background Art

[0002] SF6-filled electrical equipment, with its compact structure, stable electrical performance, strong arc-extinguishing capability, and safe and reliable operation, is now widely used in ultra-high voltage power systems. When SF6-filled electrical equipment encounters a hidden danger or fault, partial discharge or overheating within the equipment causes the SF6 gas to decompose and generate various decomposition products. Qualitative and quantitative analysis of the resulting SF6 gas decomposition products can be used to infer potential insulation hazards or faults in the electrical equipment, which is of great significance for ensuring the stable operation of the equipment and the power grid.

[0003] However, the current laboratory gas detection methods are relatively simple and it is not convenient to measure the gas accurately.

[0004] Therefore, it is necessary to design a composite optical detector based on ultraviolet differential absorption spectroscopy and microflow infrared technology to address the above problems and achieve accurate measurement of gas. Summary of the Invention

[0005] The object of the present invention is to provide a composite optical detector based on ultraviolet differential absorption spectroscopy and micro-flow infrared technology to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a composite optical detector based on ultraviolet differential absorption spectroscopy and microfluidic infrared technology, comprising:

[0007] A first measuring chamber, which is mainly used to contain the measuring gas, and the structure of the first measuring chamber is a transparent structure;

[0008] a spectrometer, arranged on the right side of the first measuring chamber;

[0009] A sample gas chamber is installed at the front end of the first measuring chamber, and the structure of the sample gas chamber is a transparent structure;

[0010] an air inlet and outlet connected between the first measuring chamber and the sample chamber, the air inlet and outlet being mainly used for filling and discharging sample gas into and out of the first measuring chamber and the sample chamber;

[0011] A second light source is installed on the left side of the second measuring chamber, and the second light source is an infrared light;

[0012] A reference gas cell is installed at the right end of the second measuring chamber.

[0013] Preferably, the spectrometer further comprises:

[0014] The first light source is installed at the left end of the first measuring chamber. The first light source, the first measuring chamber and the spectrometer are in the same straight line. The first light source is ultraviolet light.

[0015] Preferably, the sample gas chamber further comprises:

[0016] The second measuring chamber is arranged inside the sample gas chamber, and is used for containing the measuring gas.

[0017] Preferably, the second light source further includes:

[0018] A light source modulation device is provided between the second light source and the sample gas chamber, and is used to adjust and set the second light source.

[0019] Preferably, the reference air chamber further comprises:

[0020] a first chamber, which is arranged inside the reference gas chamber;

[0021] A second chamber is provided inside the reference gas chamber, the second chamber is located on the right side of the first chamber, and the gas filled in the first chamber and the second chamber is nitrogen;

[0022] A flow channel is opened on the inner bottom wall of the reference air chamber, and a communication structure is formed between the first chamber and the second chamber through the flow channel.

[0023] Preferably, the flow channel further comprises:

[0024] a filter disposed on an inner wall of the second measuring chamber, the filter being installed between the second measuring chamber and the first chamber;

[0025] A micro flow sensor is installed inside the flow channel.

[0026] Compared with the existing technology, the beneficial effects of the present invention are: the composite optical detector based on ultraviolet differential absorption spectroscopy and micro-flow infrared technology adopts a new structural design, which can measure and analyze sample gas in different bands, improve the comprehensive measurement capability of the device, and ultimately achieve the best test results;

[0027] 1. The first light source emits ultraviolet light, which passes through the measuring gas in the first measuring chamber. The light source is then received and analyzed by the spectrometer. H2S and SO2 can be measured in the ultraviolet band using ultraviolet technology.

[0028] 2. The second light source is used to irradiate the sample gas chamber. The infrared light irradiates the sample gas chamber, causing the sample gas to expand slightly, thereby generating a microflow of gas in the first chamber and the second chamber. After the flow is detected by the micro-flow sensor, an AC voltage signal is generated. After signal processing and output system, the sample gas concentration is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the isometric structure of the present invention from the left;

[0030] Figure 2 This is a schematic diagram of the isometric structure of the present invention from the right side;

[0031] Figure 3 This is a schematic diagram of the front cross-sectional structure of the sample air chamber and the reference air chamber of the present invention.

[0032] In the figure: 1. First measuring chamber; 2. First light source; 3. Spectrometer; 4. Sample gas chamber; 5. Second measuring chamber; 6. Air inlet and outlet; 7. Second light source; 8. Light source modulation device; 9. Reference gas chamber; 10. Filter; 11. First chamber; 12. Second chamber; 13. Flow channel; 14. Micro flow sensor. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-3 The present invention provides a technical solution: a composite optical detector based on ultraviolet differential absorption spectroscopy and micro-flow infrared technology, comprising: a first measuring chamber 1, which is mainly used to contain the measuring gas, and the structure of the first measuring chamber 1 is a transparent structure; a spectrometer 3, which is arranged on the right side of the first measuring chamber 1; the spectrometer 3 also includes: a first light source 2, which is installed at the left end of the first measuring chamber 1, and the first light source 2 is in the same straight line as the first measuring chamber 1 and the spectrometer 3. The first light source 2 is an ultraviolet band lamp, and the ultraviolet light band is emitted by the first light source 2 and passes through the measuring gas in the first measuring chamber 1, and then the light source is received and analyzed by the spectrometer 3, so that H2S and SO2 can be measured in the ultraviolet band using ultraviolet technology.

[0035] A composite optical detector based on ultraviolet differential absorption spectroscopy and microflow infrared technology, comprising: a sample gas chamber 4, installed at the front end of a first measuring chamber 1, the structure of the sample gas chamber 4 being a transparent structure; an air inlet and outlet 6, connected between the first measuring chamber 1 and the sample gas chamber 4, the air inlet and outlet 6 being mainly used for charging and discharging sample gas into the first measuring chamber 1 and the sample gas chamber 4; a second light source 7, installed on the left side of the second measuring chamber 5, the second light source 7 being an infrared band light; the second light source 7 further comprising: a light source modulation device 8, arranged between the second light source 7 and the sample gas chamber 4, the light source modulation device 8 being used to adjust and set the second light source 7, irradiating the sample gas chamber 4 with the second light source 7, and irradiating the sample gas chamber 4 with infrared light to cause the sample gas to expand slightly, thereby enabling the gas in the first chamber 11 and the second chamber 12 to generate microflow;

[0036] A composite optical detector based on ultraviolet differential absorption spectroscopy and microflow infrared technology includes: a reference gas chamber 9, which is installed at the right end of a second measuring chamber 5, the reference gas chamber 9 also including: a first chamber 11, which is arranged on the inner side of the reference gas chamber 9; a second chamber 12, which is arranged on the inner side of the reference gas chamber 9 and is located on the right side of the first chamber 11, and the gas filled in the first chamber 11 and the second chamber 12 is nitrogen; a flow channel 13, which is opened on the inner bottom wall of the reference gas chamber 9, and the first chamber 11 and the second chamber 12 are connected by the flow channel 13 to form a communication structure, and the flow channel 13 also includes: a filter 10, which is arranged on the inner wall of the second measuring chamber 5 and is installed between the second measuring chamber 5 and the first chamber 11; a micro flow sensor 14, which is installed on the inner side of the flow channel 13, and after the micro flow sensor 14 detects the flow, it generates an AC voltage signal, and after the signal processing and output system, the sample gas concentration is obtained.

[0037] Working principle: When using this device, first Figure 1-3 As shown, first, the measuring gas is filled into the first measuring chamber 1 and the second measuring chamber 5 through the gas inlet and outlet 6, then the first light source 2 is turned on, and the light beam passes through the first measuring chamber 1 to irradiate the spectrometer 3, and the components in the measuring gas are analyzed by the spectrometer 3; then the second light source 7 is turned on, and a suitable light beam is generated by the light source modulation device 8, so that the second light source 7 passes through the sample gas chamber 4 to illuminate the second measuring chamber 5, causing the measuring gas in the second measuring chamber 5 to expand, and the measuring gas of the light source modulation device 8 pushes the filter 10 to slightly deform toward the first chamber 11 of the reference gas chamber 9, and the gas in the first chamber 11 flows into the second chamber 12 through the flow channel 13, and when the gas flows in the flow channel 13, the micro flow sensor 14 detects the flow and generates an AC voltage signal, which is processed by the signal and output system to obtain the sample gas concentration, thereby measuring the composition of the gas.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A composite optical detector based on ultraviolet differential absorption spectroscopy and microfluidic infrared technology, characterized in that: include: A first measuring chamber (1), which is mainly used to contain the measuring gas, and the structure of the first measuring chamber (1) is a transparent structure; A spectrometer (3) is arranged on the right side of the first measurement chamber (1); a first light source (2) installed at the left end of the first measuring chamber (1), the first light source (2), the first measuring chamber (1) and the spectrometer (3) being in the same straight line, and the first light source (2) being an ultraviolet light; A sample gas chamber (4) is installed at the front end of the first measuring chamber (1), and the structure of the sample gas chamber (4) is a transparent structure; the sample gas chamber (4) includes: a second measuring chamber (5) which is arranged inside the sample gas chamber (4), and the second measuring chamber (5) is used to contain the measuring gas; an air inlet and outlet (6) connected between the first measuring chamber (1) and the sample air chamber (4), the air inlet and outlet (6) being mainly used for filling and discharging sample gas into and out of the first measuring chamber (1) and the sample air chamber (4); a second light source (7), which is installed on the left side of the second measuring chamber (5), and the second light source (7) is an infrared light; It comprises: a light source modulation device (8), the light source modulation device (8) being arranged between the second light source (7) and the sample gas chamber (4), the light source modulation device (8) being used to adjust and set the second light source (7); A reference gas chamber (9) is installed at the right end of the second measuring chamber (5); the reference gas chamber (9) comprises: a first chamber (11) arranged on the inner side of the reference gas chamber (9); a second chamber (12) arranged on the inner side of the reference gas chamber (9), the second chamber (12) being located on the right side of the first chamber (11), the gas filled in the first chamber (11) and the second chamber (12) being nitrogen; a flow channel (13) is opened on the inner bottom wall of the reference gas chamber (9), the first chamber (11) and the second chamber (12) forming a communication structure through the flow channel (13); The composite optical detector further comprises a filter (10) arranged on the inner wall of the second measuring chamber (5), the filter (10) being installed between the second measuring chamber (5) and the first chamber (11); a micro flow sensor (14) being installed on the inner side of the flow channel (13); The measuring gas of the light source modulation device (8) pushes the filter (10) to deform toward the first chamber (11) of the reference gas chamber (9), so that the gas in the first chamber (11) flows into the second chamber (12) through the flow channel (13). When the gas flows in the flow channel (13), the micro flow sensor (14) detects the flow and generates an AC voltage signal. After the signal is processed and output to the system, the sample gas concentration is obtained.

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