A laser methane detector structure

Abstract

This invention provides a laser methane detector structure, belonging to the field of laser gas detection technology. The PCB board integrates a TO semiconductor laser driver circuit, a TO optical receiver circuit, and a laser methane detector control circuit, as well as wiring and the required IC chips for these circuits. A mounting area is located on the silkscreen layer of the PCB board. An integrated gas chamber is mounted in the mounting area on the PCB board and can be connected by adhesive. The integrated gas chamber is molded from plastic with a metal-plated surface. The mounting area matches the corresponding integrated gas chamber. This invention solves the problems of time-consuming manufacturing, cumbersome assembly, and high cost, which are unfavorable for mass production and the widespread application of TDLAS technology.

Description

Technical Field

[0001] This utility model belongs to the field of laser gas detection technology, specifically relating to a laser methane detector structure. Background Technology

[0002] Currently, tunable semiconductor laser absorption spectroscopy detection technology has been widely used in the field of gas detection, especially in methane detection. However, there are still many areas where this technology needs to be improved and enhanced in practical implementation.

[0003] The optical cell structure of existing laser methane sensors, especially when folded optical paths are used to extend the optical path, is quite complex. Besides the fact that the optical cells are mostly complex in shape and often formed by metal cutting, multiple reflectors are attached inside the cells. This results in problems such as time-consuming manufacturing, complicated assembly, and high cost, which is not conducive to mass production or the widespread use of TDLAS technology. Therefore, a new laser methane detector structure is proposed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Given the following problems in the existing technology: how to design a laser methane detector structure that is efficient, low-cost, easy to assemble, and suitable for mass production and widespread use.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a laser methane detector structure, comprising,

[0007] The PCB board integrates a TO semiconductor laser driver circuit, a TO optical receiver circuit, and a laser methane detector control circuit, as well as wiring and the required IC chips for the TO semiconductor laser driver circuit, the TO optical receiver circuit, and the laser methane detector control circuit.

[0008] Mounting area, the mounting area being disposed on the silkscreen layer of the PCB board;

[0009] An integrated air chamber is installed in the mounting area on a PCB board and can be connected by adhesive. The integrated air chamber is molded from plastic and its surface is treated with metal coating. The mounting area is matched with the corresponding integrated air chamber.

[0010] The PCB board has mounting holes for mounting the TO semiconductor laser.

[0011] The TO optical receiver is provided with mounting holes on the PCB board.

[0012] Furthermore, the integrated gas chamber includes a gas chamber 1, which includes opposing inclined plates 1 and opposing vertical plates 1. The inclined plates 1 and the vertical plates 1 are fixedly connected on their adjacent sides. The gas chamber 1 has a trapezoidal structure that runs vertically through the interior. The two opposing inclined plates 1 are both set at 45°. The distance between the center points of the TO semiconductor laser and the TO optical receiver is equal to the distance between the center points of the two inclined plates 1. A reflector 1 is formed on each opposing side of the inclined plates 1.

[0013] Furthermore, the centers of the two inclined plates correspond to the centers of the TO semiconductor laser and the TO optical receiver, respectively.

[0014] Furthermore, the integrated gas chamber also includes a second gas chamber, which includes two vertically arranged plates two opposite each other, two symmetrically installed inclined plates two, and an inclined top plate one. The two vertically arranged plates two, the two inclined plates two, and the top plate one are fixedly connected on their adjacent sides. The two inclined plates two are arranged at 45°. The TO semiconductor laser and the TO optical receiver are installed below the top plate one. Reflectors two are formed on the opposite sides of the two inclined plates two and on one side of the bottom of the top plate one.

[0015] Furthermore, a wire mesh is installed on the top of the second air chamber.

[0016] Furthermore, the integrated air chamber includes an air chamber three, which includes an inclined top plate two. Vertical plates three are fixedly connected to both sides of the top plate two, and inclined plates three are fixedly connected to the other ends of the two vertical plates three. The top plate two is set at 45°, and the inclined plates three are set at 15°. A rib is connected to one side of the interior of the top plate two, and the side of the rib near the top plate two is triangular.

[0017] Furthermore, the two inclined plates three near the inside, the top plate two inside, and the rib away from the top plate two all have reflective mirrors three formed by surface metal coating.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. Simple to manufacture, molded in one piece, no need to attach additional lenses;

[0020] 2. Low cost, suitable for mass production;

[0021] 3. It can achieve multiple folding extensions of optical path, enabling miniaturization;

[0022] 4. Simple installation; it can be directly integrated with the PCB for secondary integration.

[0023] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0025] Figure 1 This is a schematic diagram of the air chamber according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the optical path structure in the air chamber of this utility model embodiment;

[0027] Figure 3 This is a schematic diagram of the second air chamber structure according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the optical path structure in the second air chamber according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the PCB board and air chamber structure according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the three-structure air chamber of an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the air chamber three without the top plate two in an embodiment of this utility model;

[0032] Figure 8 This is a schematic diagram of the three-optical-path structure of the air chamber in an embodiment of this utility model;

[0033] Figure reference numerals: 1. PCB board; 11. Inclined plate one; 12. Vertical plate one; 21. Reflector one; 22. Optical path one; 23. TO semiconductor laser; 24. TO optical receiver; 31. Top plate one; 32. Inclined plate two; 33. Vertical plate two; 41. Reflector two; 42. Optical path two; 5. Silk screen; 61. Vertical plate three; 62. Top plate two; 63. Rib; 64. Inclined plate three; 7. Mounting area. Detailed Implementation

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0037] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0038] Reference Figures 1-8 This utility model provides a laser methane detector structure, comprising:

[0039] PCB 1 integrates a TO semiconductor laser driver circuit, a TO optical receiver circuit, and a laser methane detector control circuit, as well as wiring and the required IC chips for the TO semiconductor laser driver circuit, the TO optical receiver circuit, and the laser methane detector control circuit.

[0040] Mounting area 7 is located on the silkscreen layer of PCB board 1. Mounting area 7 does not have any wiring or any IC chips, resistors, capacitors or other electronic components mounted on it.

[0041] The integrated air chamber can be constructed by plastic molding. The material can be a plastic material with a small coefficient of expansion. Air chamber one, air chamber two, and air chamber three are all integrally molded. The integrated air chamber is installed in the mounting area 7 on the PCB board 1 and can be connected by adhesive. The surface of the integrated air chamber is treated by metallization coating with high reflectivity materials such as chromium or aluminum. The mounting area 7 is matched with the corresponding integrated air chamber.

[0042] TO semiconductor laser 23, the PCB board 1 has mounting holes for mounting TO semiconductor laser 23, the TO semiconductor laser 23 is mounted on the PCB board 1 and connected to the corresponding circuit;

[0043] TO optical receiver 24 is mounted on PCB board 1 with mounting holes. TO optical receiver 24 is mounted on PCB board 1 and connected to the corresponding circuit.

[0044] The TO semiconductor laser 23 can be encapsulated with a spherical lens to collimate the output light, and the TO optical receiver 24 can be focused with a large-aperture lens to ensure the light-receiving efficiency of the photodetector.

[0045] Example 1

[0046] The integrated gas chamber includes a gas chamber 1, which comprises opposing inclined plates 11 and opposing vertical plates 12. The adjacent sides of the inclined plates 11 and 12 are fixedly connected. The gas chamber 1 has a trapezoidal structure that extends vertically. The two opposing inclined plates 11 are both set at 45°. To facilitate the flow of the gas being measured, small ventilation holes can also be provided on the two vertical plates. The distance between the center points of the TO semiconductor laser 23 and the TO optical receiver 24 is equal to the distance between the center points of the two inclined plates 11. Reflectors 21 are formed on opposite sides of the inclined plates 11 due to surface metal coating. The centers of the two inclined plates 11 correspond to the centers of the TO semiconductor laser 23 and the TO optical receiver 24, respectively. The collimated light emitted by the TO semiconductor laser 23, after being reflected by the 45° reflector 21 on its upper side, becomes parallel to the bottom surface of the gas chamber 1 and, after being reflected by the 45° reflector 21 on its upper side, is perpendicular to the PCB board 1 and incident on the TO optical receiver 24. Figure 2 As shown, each side of the inclined plate 11 has a reflector 21 formed by a surface metal coating for reflection, and the optical path 22 is the optical path from the collimated light emitted from the TO semiconductor laser 23 to the TO optical receiver 24.

[0047] Example 2

[0048] The integrated gas chamber also includes a second gas chamber, which comprises two opposing vertical plates 33, two symmetrically installed inclined plates 32, and an inclined top plate 31. The two vertical plates 33, the two inclined plates 32, and the top plate 31 are fixedly connected on adjacent sides. The two inclined plates 32 are set at 45°. To facilitate the flow of the gas being measured, small ventilation holes can also be opened on the two vertical plates. The TO semiconductor laser 23 and the TO photodetector 24 are installed below the top plate 31. The opposing sides of the two inclined plates 32 and the bottom side of the top plate 31 are reflective due to the surface metal coating. Mirror 2 41; A wire mesh 5 is installed on the top of the gas chamber 2. The collimated light emitted by the TO semiconductor laser 23 passes through the mirror 2 41 on the top plate 1 31 and then through the mirror 2 41 on the inclined plate 2 32 to form a Π-shaped light path 2 42. It then returns to the mirror 2 41 on the top plate 1 31 and is reflected before entering the TO light receiver 24. Due to the folding of the light path, the light path of the laser in the gas chamber is extended, which can directly improve the detection sensitivity of the laser methane detector. The wire mesh 5 prevents unnecessary dust and debris from entering the gas chamber and at the same time allows the methane gas in the surrounding space to enter the gas chamber smoothly.

[0049] Example 3

[0050] The integrated gas chamber includes a gas chamber three, which includes an inclined top plate two 62. Vertical plates three 61 are fixedly connected to both sides of the top plate two 62, and inclined plates three 64 are fixedly connected to the other ends of the two vertical plates three 61. The top plate two 62 is set at 45°, and the inclined plates three 64 is set at 15°. A rib 63 is connected to one side of the inside of the top plate two 62. The side of the rib 63 near the top plate two 62 is triangular. To facilitate the flow of the gas to be measured, some small ventilation holes can also be opened on the two vertical plates three 61. The side of the two inclined plates three 64 near the inside, the side of the top plate two 62 inside, and the side of the rib 63 away from the top plate two 62 all have reflectors three formed by surface metal coating. The collimated light emitted by the TO semiconductor laser 23 can be reflected by the 45° reflector three and then reach the reflector three of the top plate two 62 along an M-shaped light path three and then be reflected back to the TO light receiver 24.

[0051] Therefore, the integrated gas chamber is suitable for various folded cavities. By appropriately designing the frame shape and increasing the number of reflectors, a greater optical path extension can be achieved to maximize the improvement of methane detection sensitivity.

[0052] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A laser methane detector structure, characterized by, include, PCB board (1), the PCB board (1) integrates a TO semiconductor laser driving circuit, a TO optical receiver receiving circuit and a laser methane detector control circuit, as well as wiring and required IC chips for the TO semiconductor laser driving circuit, the TO optical receiver receiving circuit and the laser methane detector control circuit. Mounting area (7), which is disposed on the silkscreen layer on the PCB board (1); An integrated air chamber is installed in the mounting area (7) on the PCB board (1). The integrated air chamber is made of plastic by molding and its surface is treated with metal coating. The mounting area (7) is matched with the corresponding integrated air chamber. TO semiconductor laser (23), the PCB board (1) has mounting holes for mounting the TO semiconductor laser (23); TO optical receiver (24) is provided on the PCB board (1) with mounting holes for mounting the TO optical receiver (24).

2. A laser methane detector structure according to claim 1, characterized in that: The integrated air chamber includes an air chamber 1, which includes opposing inclined plates 1 (11) and opposing vertical plates 1 (12). The adjacent sides of the inclined plates 1 (11) and vertical plates 1 (12) are fixedly connected. The air chamber 1 has a trapezoidal structure that runs vertically through the interior. The two opposing inclined plates 1 (11) are set at 45°. The distance between the center points of the TO semiconductor laser (23) and the TO optical receiver (24) is equal to the distance between the center points of the two inclined plates 1 (11). The opposing sides of the inclined plates 1 (11) are each covered with a reflector 1 (21) formed by a surface metal coating.

3. A laser methane detector structure according to claim 2, wherein: The centers of the two inclined plates (11) correspond to the centers of the TO semiconductor laser (23) and the TO optical receiver (24), respectively.

4. The laser methane detector structure of claim 1, wherein: The integrated gas chamber also includes a second gas chamber, which includes two vertical plates (33) arranged opposite each other, two symmetrically installed inclined plates (32) and an inclined top plate (31). The two vertical plates (33), the two inclined plates (32) and the top plate (31) are fixedly connected on their adjacent sides. The two inclined plates (32) are arranged at 45°. The TO semiconductor laser (23) and the TO optical receiver (24) are installed below the top plate (31). The opposite sides of the two inclined plates (32) and the bottom side of the top plate (31) are all covered with a reflector (41) formed by a surface metal coating.

5. A laser methane detector structure according to claim 4, wherein: A wire mesh (5) is installed on the top of the second air chamber.

6. The laser methane detector structure of claim 1, wherein: The integrated air chamber includes an air chamber three, which includes an inclined top plate two (62). Vertical plates three (61) are fixedly connected to both sides of the top plate two (62), and inclined plates three (64) are fixedly connected to the other ends of the two vertical plates three (61). The top plate two (62) is set at 45°, and the inclined plates three (64) are set at 15°. A rib (63) is connected to one side of the interior of the top plate two (62), and the rib (63) is triangular on the side near the top plate two (62).

7. A laser methane detector structure according to claim 6, wherein: The two inclined plates (64) on the inner side, the top plate (62) on the inner side, and the rib (63) on the side away from the top plate (62) all have a reflector (3) formed by a surface metal coating.

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