Laser methane sensor laser loop structure system

Abstract

A laser circuit structure system for a laser methane sensor includes an upper probe cover, a middle probe cover, and a lower probe cover. A laser sensor and a laser detector are mounted side-by-side at one end of the middle probe cover, and a first refractive lens and a second refractive lens are mounted at the other end. Two first refractive lenses are arranged perpendicularly to each other, corresponding to the laser sensor and the laser detector respectively. The mirror surface of the first refractive lens forms a 45° angle with the laser light emitted from the laser sensor or the laser detector. Four second refractive lenses are arranged perpendicularly to each other in pairs. The laser light refracted by the first refractive lens corresponding to the laser sensor is directed towards the second refractive lens, and finally refracted to another first refractive lens and reflected back onto the laser detector. This invention uses an O-type circuit design, with the laser sensor and laser detector positioned on the left and right sides respectively. This design allows for larger lens positions, lower processing angle requirements, easier processing, and significantly reduced installation difficulty.

Description

Technical Field

[0001] This utility model relates to the field of sensors, and in particular to a laser circuit structure system for a laser methane sensor. Background Technology

[0002] Laser methane sensors work by emitting a laser, which is then refracted and returns to the laser detector. The higher the methane concentration in the cavity, the greater the attenuation of the laser. The longer the laser path, the greater the attenuation, and the higher the measurement accuracy.

[0003] Existing laser methane sensors mainly come in two types: through-beam and loop refraction. Through-beam laser methane sensors have a simple structure, but to achieve measurement accuracy, the laser path needs to be relatively long. This can only be achieved by increasing the sensor size, making them unsuitable for certain confined working conditions. Loop refraction laser methane sensors increase the laser path length through refraction, but this method is difficult to manufacture, requires a small mirror surface, and demands precise installation angles, making installation challenging. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology, such as the large size of the through-beam type and the difficulty of installation of the refractive type, and to provide a laser circuit structure system for a laser methane sensor.

[0005] The technical solution adopted by this utility model to solve its technical problem is a laser circuit structure system for a laser methane sensor, including an upper probe cover, a middle probe cover, and a lower probe cover. The upper and lower probe covers are hollow inside and coaxially connected. The middle probe cover is located in the internal space formed by the interconnection of the upper and lower probe covers. A laser sensor and a laser detector are installed side by side at one end of the middle probe cover, and a first refractive lens and a second refractive lens are installed at the other end.

[0006] Two first refractive lenses are provided and are arranged perpendicularly to each other. The two first refractive lenses correspond to the laser sensor and the laser detector, respectively. The mirror surface of the first refractive lens forms a 45° angle with the laser emitted by the laser sensor and a 45° angle with the laser recovered by the laser detector. Four second refractive lenses are provided and are arranged perpendicularly to each other in pairs. The laser light refracted by the first refractive lens corresponding to the laser sensor is directed to the second refractive lens, and finally refracted to another first refractive lens and reflected back to the laser detector.

[0007] Furthermore, the laser sensor and laser detector are arranged parallel to each other along the axis of the central probe cover.

[0008] Furthermore, the laser light refracted by the first and second refractive lenses is located in the same plane.

[0009] Furthermore, the four second refractive lenses are evenly distributed along the circumference of the central probe cover.

[0010] Furthermore, the first refractive lens is located on the side of one of the second refractive lenses, and the two first refractive lenses are located in the middle of the two second refractive lenses.

[0011] Furthermore, a circuit board is also installed on the probe cover, and the laser sensor and laser detector are electrically connected to the circuit board.

[0012] Furthermore, the lower probe cover is equipped with a breathable membrane, a rubber pad, and a locking buckle, arranged sequentially from bottom to top.

[0013] This utility model has the following beneficial technical effects:

[0014] By positioning the laser sensor and laser detector on the left and right sides respectively and using an O-type loop design, the lens position is larger, the processing angle requirement is lower, the processing is convenient, and the installation difficulty is also greatly reduced. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of an embodiment of the laser circuit structure system for a laser methane sensor according to this utility model;

[0016] Figure 2 This is a laser refraction diagram of an embodiment of the laser circuit structure system of a laser methane sensor according to this utility model;

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Upper probe cover; 2. Middle probe cover; 21. Laser sensor; 22. Laser detector; 23. First refractive lens; 24. Second refractive lens; 25. Circuit board; 3. Lower probe cover; 31. Breathable membrane; 32. Rubber pad; 33. Locking buckle. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] Reference Figure 1 This embodiment includes an upper probe cover 1, a middle probe cover 2, and a lower probe cover 3. The upper probe cover 1 and the lower probe cover 3 are hollow inside and coaxially connected. The middle probe cover 2 is located within the internal space formed by the combination of the upper probe cover 1 and the lower probe cover 3, and its two sides protrude to connect the upper probe cover 1 and the lower probe cover 3. In addition, the outer diameter of the probe cover is the same as that of existing probe covers.

[0021] Reference Figure 1 and Figure 2 The lower probe cover 3 is equipped with a breathable membrane 31, a rubber pad 32 and a locking buckle 33 in sequence from bottom to top. The middle probe cover 2 is equipped with a laser sensor 21 and a laser detector 22 side by side at one end, and a first refractive lens 23 and a second refractive lens 24 at the other end.

[0022] Reference Figure 1 and Figure 2 Specifically, one end of the central probe cover 2 has a groove, in which the first refractive lens 23 and the second refractive lens 24 are installed. The laser sensor 21 and the laser detector 22 are located at the other end and pass through the central probe cover 2 to emit and recover lasers.

[0023] Reference Figure 1 and Figure 2 Two first refractive lenses 23 are provided, which are arranged perpendicularly to each other and obliquely within the groove, respectively corresponding to the laser sensor 21 and the laser detector 22. The first refractive lens 23 corresponding to the laser sensor 21 is tilted at 45° away from the laser detector 22 from its facing position. The first refractive lens 23 corresponding to the laser detector 22 is tilted at 45° away from the laser sensor 21 from its facing position. The two first refractive lenses 23 are fixedly connected to the bottom and side surfaces of the groove. The laser emitted by the laser sensor 21 is refracted by the first refractive lenses 23 and emitted away from the laser detector 22, parallel to the bottom of the groove.

[0024] Reference Figure 1 and Figure 2 There are four second refractive lenses 24. The four second refractive lenses 24 are fixed on the side of the groove and are evenly distributed along the circumference of the groove. They are also arranged perpendicular to each other in pairs. The two first refractive lenses 23 are located in the middle of the two second refractive lenses 24. The laser light refracted by the first refractive lens 23 corresponding to the laser sensor 21 is directed to the adjacent second refractive lens 24. After being refracted by the four second refractive lenses 24 in sequence, it is refracted to another first refractive lens 23 and reflected back to the laser detector 22.

[0025] Furthermore, the laser sensor 21 and laser detector 22 are arranged parallel to the laser direction along the axis of the central probe cover 2, and the laser refracted by the first refractive lens 23 and the second refractive lens 24 are located in the same plane. A circuit board 25 is also mounted on the central probe cover 2, and the laser sensor 21 and laser detector 22 are soldered to the circuit board 25. The intensity of the laser is collected by the circuit board 25 and converted into the concentration of methane.

[0026] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A laser circuit structure system for a laser methane sensor, characterized in that, It includes an upper probe cover (1), a middle probe cover (2), and a lower probe cover (3). The upper probe cover (1) and the lower probe cover (3) are hollow inside and coaxially connected. The middle probe cover (2) is located in the internal space formed by the interconnection of the upper probe cover (1) and the lower probe cover (3). A laser sensor (21) and a laser detector (22) are installed side by side at one end of the middle probe cover (2), and a first refractive lens (23) and a second refractive lens (24) are installed at the other end. Two first refractive lenses (23) are provided and are arranged perpendicularly to each other. The two first refractive lenses (23) correspond to the laser sensor (21) and the laser detector (22) respectively. The mirror surface of the first refractive lens (23) forms a 45° angle with the laser emitted by the laser sensor (21) and the mirror surface of the first refractive lens (23) forms a 45° angle with the laser recovered by the laser detector (22). Four second refractive lenses (24) are provided and are arranged perpendicularly to each other in pairs. At the same time, the laser refracted by the first refractive lens (23) corresponding to the laser sensor (21) is directed to the second refractive lens (24) and finally refracted to another first refractive lens (23) and reflected back to the laser detector (22).

2. The laser circuit structure system for a laser methane sensor according to claim 1, characterized in that, The laser sensor (21) and the laser detector (22) are arranged parallel to each other along the axis of the probe cover (2).

3. The laser circuit structure system for a laser methane sensor according to claim 1, characterized in that, The lasers refracted by the first refractive lens (23) and the second refractive lens (24) are located in the same plane.

4. The laser circuit structure system for a laser methane sensor according to claim 1, characterized in that, The four second refractive lenses (24) are evenly distributed along the circumference of the central probe cover (2).

5. The laser circuit structure system for a laser methane sensor according to claim 1, characterized in that, The first refractive lens (23) is located on the side of one of the second refractive lenses (24), and the two first refractive lenses (23) are located in the middle of the two second refractive lenses (24).

6. The laser circuit structure system for a laser methane sensor according to claim 1, characterized in that, A circuit board (25) is also installed on the probe cover (2), and the laser sensor (21) and laser detector (22) are electrically connected to the circuit board (25).

7. The laser circuit structure system for a laser methane sensor according to claim 1, characterized in that, The lower probe cover (3) is equipped with a breathable membrane (31), a rubber pad (32) and a locking buckle (33) from bottom to top.

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