A reflective optical system for gas concentration detection

Abstract

The utility model provides a kind of reflection optical system for gas concentration detection, including gas chamber cylinder, light source assembly, detector assembly and reflection component are equipped in gas chamber cylinder, light source assembly and detector assembly are arranged in the same end of gas chamber cylinder, reflection component is arranged in the other end of gas chamber cylinder, it is the closed test chamber between light source assembly and reflection component in gas chamber cylinder, light emitted by light source assembly reaches detector assembly after being reflected by reflection component.The reflection optical system is low in processing and assembling difficulty, saves cost, increases system reliability simultaneously, improves product service life.

Description

Technical Field

[0001] This utility model relates to the field of gas concentration detection technology, and specifically to a reflective optical system for gas concentration detection. Background Technology

[0002] Infrared gas detection technology accurately detects the concentration of specific gases by detecting changes in the absorption intensity of light at a specific wavelength after the interaction of infrared light with gas molecules. Infrared gas detection technology features fast response speed, high measurement accuracy, normal operation in oxygen-free environments, long service life, and no harmful gas poisoning or aging phenomena. Therefore, it has wide applications in industrial process control, environmental monitoring, and other fields.

[0003] In existing technologies, the test chambers used in traditional infrared gas detection technologies typically employ a through-beam structure. This through-beam structure is a closed structure with the walls participating in reflection. In industrial processes (such as monitoring combustible gases in regenerative thermal oxidizers (RTOs), it is susceptible to contamination by organic matter and dust, making disassembly and cleaning troublesome. Furthermore, under the same optical path conditions, the chamber length is relatively large, resulting in a correspondingly large detection device size.

[0004] To address the aforementioned drawbacks, reflective infrared gas detection technology has emerged. This technology relies on the reflection and focusing of light by a mirror to reduce the optical path length and enable effective light detection by the detector. It also allows for an open optical path, facilitating subsequent cleaning and maintenance. However, existing reflective optical paths often employ an oblique incident light design, with the light source and detection modules placed at an angle. This increases the difficulty of manufacturing and assembly, as well as system instability, resulting in complex structures and challenges in subsequent processing and assembly. Furthermore, in specific industrial process environments, such as complex gas testing locations prone to crystallization, the gas directly contacts the reflector coating, requiring frequent cleaning. The cleaning process can easily damage the reflective coating. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a reflective optical system for gas concentration detection, which is easy to manufacture and assemble, saves costs, increases system reliability, and extends product lifespan.

[0006] To achieve the above objectives, this utility model provides a reflective optical system for gas concentration detection, comprising a gas chamber cylinder, a light source assembly, a detector assembly, and a reflective assembly disposed within the gas chamber cylinder. The light source assembly and the detector assembly are disposed at the same end of the gas chamber cylinder, and the reflective assembly is disposed at the other end of the gas chamber cylinder. The gas chamber cylinder contains a sealed test chamber located between the light source assembly and the reflective assembly. The light emitted by the light source assembly is reflected by the reflective assembly and then reaches the detector assembly.

[0007] Furthermore, the light source assembly and the detector assembly are symmetrically arranged on both sides of the test chamber axis, and the end of the test chamber is provided with a sealed isolation window covering the light source assembly and the detector assembly.

[0008] Furthermore, the light source assembly includes an infrared light source and a parabolic condenser cup, the reflector assembly includes a concave reflector, and a reflector protection window is covered on the surface of the concave reflector. The detector assembly includes a photodetector and a detector bracket. The photodetector includes two photosensitive surfaces: a first square photodetector and a second square photodetector. The light emitted by the filament of the infrared light source is reflected, collimated, and focused by the parabolic surface of the parabolic condenser cup. After passing through the sealed isolation window and the reflector protection window, it reaches the concave surface of the concave reflector and is focused again, illuminating the photosensitive surface of the photodetector in the form of a light spot.

[0009] Furthermore, the reflector protection window is closely attached to the concave surface of the concave reflector, and a gap is left between the sealing isolation window and the reflector protection window as the infrared absorption light path.

[0010] Furthermore, the gas chamber contains a pad for mounting the light source assembly and the detector assembly. One side of the pad is provided with an optical bracket for mounting the sealed isolation window. The side of the pad away from the optical bracket is provided with a circuit board, which is electrically connected to the infrared light source and the photodetector.

[0011] Furthermore, the side of the gas chamber is provided with two compression fittings, which are located on the same side of the gas chamber. The two compression fittings are used for the entry and exit of sample gas respectively.

[0012] The reflective optical system for gas concentration detection according to this invention has the following advantages:

[0013] The light source assembly and photodetector are horizontally placed and symmetrical, which reduces the difficulty of processing and assembly, saves costs, and increases system reliability. A protective window is added to the front of the concave reflector to reduce the possibility of lens damage during maintenance and improve product lifespan. Attached Figure Description

[0014] The present invention will be further described and explained below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the optical path of a reflective optical system for gas concentration detection according to the preferred embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram used to illustrate the structure of the light source component.

[0017] Figure 3 This is a cross-sectional view of a reflective optical system used for gas concentration detection.

[0018] Reference numerals: 1. Infrared light source; 101. Filament; 2. Parabolic condenser cup; 201. Parabolic surface; 3. Photodetector; 301. First square light detector; 302. Second square light detector; 4. Sealed isolation window; 401. First light-blocking annular surface; 5. Reflector protection window; 501. Second light-blocking annular surface; 6. Concave reflector; 601. Concave surface; 7. Detector bracket; 8. Circuit board; 9. Pad; 10. Optical bracket; 11. Protective cover; 12. Gas chamber cylinder; 13. Compression fitting. Detailed Implementation

[0019] The technical solution of this utility model will be more clearly and completely explained below with reference to the accompanying drawings and through the description of the preferred embodiments of this utility model.

[0020] like Figure 1 and Figure 3 As shown, a reflective optical system for gas concentration detection according to the preferred embodiment of this utility model includes a gas chamber cylinder 12. Two clamping connectors 13 are provided on the side of the gas chamber cylinder 12. The two clamping connectors 13 are located on the same side of the gas chamber cylinder 12, and the two clamping connectors 13 are used for the entry and exit of sample gas respectively.

[0021] like Figure 1 and Figure 3 As shown, the gas chamber 12 contains a light source assembly, a detector assembly, and a reflector assembly. The light source assembly and the detector assembly are located at the same end of the gas chamber 12, and the reflector assembly is located at the other end of the gas chamber 12. The gas chamber 12 contains a sealed test chamber between the light source assembly and the reflector assembly. The light source assembly and the detector assembly are symmetrically arranged on both sides of the axis of the test chamber. The light emitted by the light source assembly is reflected by the reflector assembly and then reaches the detector assembly.

[0022] like Figure 1 and Figure 2 As shown, the light source assembly includes an infrared light source 1 and a parabolic condenser cup 2. The infrared light source 1 typically uses a common incandescent lamp, a blackbody radiation source, or other light sources. Figure 3 As shown, the reflective assembly includes a concave reflector 6. The concave surface 601 of the concave reflector 6 is typically made of a metal film such as gold, silver, or aluminum, or other dielectric films. A reflector protection window 5 covers the surface of the concave reflector 6. The detector assembly includes a photodetector 3 and a detector bracket 7. The photodetector 3 includes two photosensitive surfaces: a first square photodetector 301 and a second square photodetector 302. The photodetector 3 generally uses a dual-channel pyroelectric or thermopile detector. A sealed isolation window 4 covering the light source assembly and the detector assembly is provided at the end of the test chamber. The sealed isolation window 4 and the reflector protection window 5 are typically made of calcium fluoride, sapphire, or other infrared-transmitting materials.

[0023] like Figure 1 and Figure 2 As shown, the light emitted by the filament 101 of the infrared light source 1 is reflected, collimated, and focused by the parabolic surface 201 of the parabolic condenser cup 2. After passing through the sealed isolation window 4 and the reflector protection window 5, it reaches the concave surface 601 of the concave reflector 6 and is focused again, illuminating the photosensitive surface of the photodetector 3 in the form of a light spot of appropriate size.

[0024] like Figure 1 and Figure 3 As shown, the reflector protection window 5 is closely attached to the concave surface 601 of the concave reflector 6. A gap is left between the sealing isolation window 4 and the reflector protection window 5 as the infrared absorption light path. This distance is determined according to the type and concentration of the gas being measured.

[0025] like Figure 3 As shown, the gas chamber 12 contains a pad 9 for mounting the light source assembly and the detector assembly. One side of the pad 9 has an optical bracket 10 for mounting the sealed isolation window 4; both are fixed together using screws or adhesive for easy installation. A circuit board 8 is located on the side of the pad 9 opposite to the optical bracket 10. The circuit board 8 is electrically connected to the infrared light source 1 and the photodetector 3 via lead wires. The gas chamber 12 is equipped with a protective cover 11 to protect the circuit components.

[0026] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. A reflective optical system for gas concentration detection, characterized in that, The device includes a gas chamber cylinder, within which a light source assembly, a detector assembly, and a reflector assembly are disposed. The light source assembly and the detector assembly are disposed at the same end of the gas chamber cylinder, and the reflector assembly is disposed at the other end of the gas chamber cylinder. The gas chamber cylinder contains a sealed test chamber between the light source assembly and the reflector assembly. The light emitted by the light source assembly is reflected by the reflector assembly and then reaches the detector assembly.

2. The reflective optical system for gas concentration detection according to claim 1, characterized in that, The light source assembly and the detector assembly are symmetrically arranged on both sides of the test chamber axis, and the end of the test chamber is provided with a sealed isolation window covering the light source assembly and the detector assembly.

3. A reflective optical system for gas concentration detection according to claim 2, characterized in that, The light source assembly includes an infrared light source and a parabolic condenser cup. The reflector assembly includes a concave reflector mirror, and a reflector protection window covers the mirror surface of the concave reflector mirror. The detector assembly includes a photodetector and a detector bracket. The photodetector includes two photosensitive surfaces: a first square photodetector and a second square photodetector. The light emitted by the filament of the infrared light source is reflected, collimated, and focused by the parabolic surface of the parabolic condenser cup. After passing through the sealed isolation window and the reflector protection window, the light reaches the concave surface of the concave reflector mirror and is focused again, illuminating the photosensitive surface of the photodetector in the form of a light spot.

4. A reflective optical system for gas concentration detection according to claim 3, characterized in that, The reflector protection window is in close contact with the concave surface of the concave reflector, and a gap is left between the sealing isolation window and the reflector protection window as the infrared absorption light path.

5. A reflective optical system for gas concentration detection according to claim 3, characterized in that, The gas chamber contains a pad for mounting the light source assembly and the detector assembly. One side of the pad is provided with an optical bracket for mounting a sealed isolation window. The side of the pad away from the optical bracket is provided with a circuit board, which is electrically connected to the infrared light source and the photodetector.

6. A reflective optical system for gas concentration detection according to claim 1, characterized in that, The gas chamber cylinder is provided with two ferrule connectors on its side. The two ferrule connectors are located on the same side of the gas chamber cylinder and are used for the entry and exit of sample gas, respectively.

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