Gas detection device with adjustable optical path

Abstract

The gas detection device comprises a gas chamber for accommodating gas to be detected, a light source unit for emitting light and a light receiving unit for receiving light are arranged at the left end and the right end of the gas chamber respectively, and a movable reflecting surface is arranged on the inner wall, close to the left end of the gas chamber, of the gas chamber; the movable reflecting surface is rotationally connected with the air chamber through an adjusting structure, the adjusting structure can adjust the rotating angle of the movable reflecting surface, a fixed reflecting surface is fixedly arranged on the inner wall of the air chamber between the movable reflecting surface and the right end of the air chamber, and light emitted by the light source unit is reflected to the light receiving unit through the movable reflecting surface and the fixed reflecting surface. The gas detection device is simple in structure, the requirement for the light beam divergence angle of the light source is low, the light source with the large light beam divergence angle can be used for detecting gas, and the universality of the gas detection device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas detection, specifically relates to a gas detection device with adjustable optical path. BACKGROUND

[0002] The existing gas detection device with adjustable optical path usually uses Beer-Lambert law to inverse gas concentration, Beer-Lambert law I=I0e -αCL Wherein I0 is the output original light intensity, after the length L, concentration C gas absorption, the received light intensity I is obtained, alpha is the gas absorption coefficient related to the gas characteristics, in the case of length L known, gas concentration C is solved as unknown quantity through the ratio of I and I0. In this way, for the known gas chamber structure, the length, that is, the optical path L is certain, the gas concentration C can be obtained. The optical path L of the gas sensor determines the range and accuracy of the sensor, generally, the optical path of the sensor is certain, suitable for a certain range and accuracy of gas detection, and it does not have universality. In order to adjust the optical path in the existing technology, a mirror group with adjustable angle is arranged in the gas detection device, such as the integrated gas detection device disclosed in Chinese patent CN212845013U, which makes the parallel light converted by the collimating lens of the laser beam irradiate from the same side of the laser beam through the mirror group, and adjusts the angle of the mirror, thereby adjusting the optical path. But the gas detection device in the patent is only suitable for light sources with small beam divergence angle, only such light sources can be converted into parallel light by the collimating lens, and it is not suitable for light sources with large beam divergence angle, which limits the universality of the gas detection device. SUMMARY

[0003] In view of the defects in the prior art, the present application provides a gas detection device with adjustable optical path to solve the poor universality of the gas detection device caused by the limited divergence angle of the beam in the prior art.

[0004] In order to achieve the above-mentioned purpose of the application, the technical scheme provided by the present application is as follows:

[0005] A gas detection device with adjustable optical path, comprising a gas chamber containing the gas to be measured, a light source unit emitting light and a light receiving unit receiving light are respectively arranged at the left and right ends of the gas chamber, an active reflecting surface is arranged on the inner wall of the gas chamber close to the left end of the gas chamber, the active reflecting surface is rotationally connected with the gas chamber through an adjusting structure, the adjusting structure can adjust the angle of rotation of the active reflecting surface, a fixed reflecting surface is fixedly arranged on the inner wall of the gas chamber between the active reflecting surface and the right end of the gas chamber, the light emitted by the light source unit is reflected to the light receiving unit through the active reflecting surface and the fixed reflecting surface.

[0006] In an embodiment, the gas detection device further comprises a master control unit, the light source unit, the light receiving unit and the adjusting structure are electrically connected with the master control unit, the master control unit can control the light source unit to emit light beams, the master control unit can calculate the gas concentration according to the result of the light receiving unit, and the master control unit can also control the adjusting structure to adjust the included angle between the movable reflecting surface and the inner wall of the gas chamber.

[0007] In an embodiment, the light emitting component in the light source unit can be replaced to emit different light.

[0008] In an embodiment, the light emitting component is a semiconductor laser of a distributed feedback laser or a wide spectrum light source LED.

[0009] In an embodiment, one or more movable reflecting surfaces are arranged in the gas detection device.

[0010] In an embodiment, the adjusting structure comprises a rotating shaft, the rotating shaft is fixedly connected with the end of a connecting rod, the connecting rod is arranged along the radial direction of the rotating shaft, the other end of the connecting rod is fixedly connected with the movable reflecting surface, and the rotating shaft drives the movable reflecting surface to rotate when the rotating shaft rotates.

[0011] In an embodiment, the rotating shaft is fixedly connected with the ends of two connecting rods, the two connecting rods are in the shape of an "eight", and the other ends of the two connecting rods are respectively fixedly connected with the left and right sides of the movable reflecting surface.

[0012] The gas detection device with adjustable optical path of the present application has the following positive and beneficial effects:

[0013] The gas detection device with adjustable optical path in the present application is provided with a light source unit emitting light on the same side of the gas chamber and a movable reflecting surface rotatingly connected with the gas chamber, and is provided with a fixed reflecting surface and a light receiving unit on the other side of the gas chamber, the light emitted by the light source unit is reflected by the movable reflecting surface and the fixed reflecting surface and emitted to the light receiving unit, without the need of converting the light into parallel light, the gas detection device in the present application has a simple structure and low requirements on the beam divergence angle of the light source, can use a light source with a large beam divergence angle to detect the gas, and improves the versatility of the gas detection device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a structural schematic diagram of the gas detection device with adjustable optical path in the embodiment of the present application;

[0015] Figure 2 FIG. 2 is a route schematic diagram of the light in the gas detection device with adjustable optical path in the embodiment of the present application;

[0016] Figure 3 FIG. 3 is a structural schematic diagram of the adjusting mechanism in the embodiment of the present application.

[0017] Reference numerals: 1 - light source unit, 2 - light receiving unit, 3 - air chamber, 4 - movable reflecting surface, 5 - adjusting structure, 501 - rotating shaft, 502 - connecting rod, 6 - main control unit, 7 - fixed reflecting surface. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described below in detail with reference to the embodiments shown in the drawings. However, it should be understood that the description is only exemplary and is not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0019] The terms used in the present disclosure are merely for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a," "an," and "the" used in the present disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, third, etc. can be used in this disclosure to describe various information, these information should not be limited to these terms, and should not be understood as indicating or implying relative importance. These terms are only used to distinguish one type of information from another type of information. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon determination" or "in response to determining".

[0021] In the description of the present application, unless otherwise specified and limited, it is necessary to explain that the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be mechanical connection, or the communication between the two elements, it can be direct connection, or indirect connection through intermediate medium, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] In order to better understand the technical solutions of the present application, the present application will be described in detail below with reference to the drawings.

[0023] As Figure 1 , 2As shown, the embodiment provides a gas detection device with adjustable optical path, which comprises a gas chamber 3 containing the gas to be detected, a light source unit 1 and a light receiving unit 2 are arranged at the left and right ends of the gas chamber 3 respectively, an active reflecting surface 4 is arranged on the inner wall of the gas chamber 3 near the left end of the gas chamber 3, the active reflecting surface 4 is rotatably connected with the gas chamber 3 through an adjusting structure 5, the adjusting structure 5 can adjust the angle of rotation of the active reflecting surface 4, a fixed reflecting surface 7 is fixedly arranged on the inner wall of the gas chamber 3 between the active reflecting surface 4 and the right end of the gas chamber 3, and the light emitted by the light source unit 1 is reflected by the active reflecting surface 4 and the fixed reflecting surface 7 and then emitted to the light receiving unit 2.

[0024] The gas detection device in the embodiment further comprises a master control unit 6, the light source unit 1, the light receiving unit 2 and the adjusting structure 5 are electrically connected with the master control unit 6, the master control unit 6 can control the light source unit 1 to emit a light beam, the master control unit 6 can calculate the gas concentration according to the result of the light receiving unit 2, and the master control unit 6 can also control the adjusting structure 5 to adjust the included angle between the active reflecting surface 4 and the inner wall of the gas chamber, so that the propagation path of the light in the gas chamber is changed, thereby achieving the effect of changing the optical path.

[0025] In the embodiment, the light emitting component in the light source unit 1 can be replaced to emit different light, and the light emitting component is a semiconductor laser of a distributed feedback laser or a wide spectrum light source LED. One or more active reflecting surfaces 4 are arranged in the gas detection device, so that different optical paths can be formed to improve the versatility of the gas detection device.

[0026] As shown in the drawings, Figure 3 The adjusting structure 5 comprises a rotating shaft 501, the rotating shaft 501 is fixedly connected with the end of a connecting rod 502, the connecting rod 502 is arranged along the radial direction of the rotating shaft 501, the other end of the connecting rod 502 is fixedly connected with the active reflecting surface 4, and the rotating shaft 501 drives the active reflecting surface 4 to rotate when the rotating shaft 501 rotates. In order to increase the stability of the adjusting structure 5, the rotating shaft 501 is fixedly connected with the ends of two connecting rods 502, the two connecting rods 502 are in the shape of an "eight", and the other ends of the two connecting rods 502 are fixedly connected with the left and right sides of the active reflecting surface 4 respectively.

[0027] In order to better understand the present application, the working process of the gas detection device provided by the present application will be described in detail in combination with Figure 1 and Figure 2 The gas to be detected is introduced into the gas chamber 3, the light source unit 1 emits light, the light is emitted to the light receiving unit 2 through the active reflecting surface 4 and the fixed reflecting surface 7 in sequence, and the master control unit 6 can calculate the gas concentration according to the result of the light receiving unit 2. The master control unit 6 controls the rotating shaft in the adjusting structure 5 to rotate to adjust the angle between the active reflecting surface 4 and the inner wall of the gas chamber 3, so as to change the optical path of the laser beam in the gas chamber 11, so that the optical path reaches the optimal optical path, thereby improving the accuracy of gas detection, as shown in the drawings. Figure 2In the middle, the solid line is the light path diagram when the movable reflecting surface 4 is parallel to the upper and lower inner walls of the air chamber 3, and the dashed line is the light path diagram when the movable reflecting surface 4 has an angle with the upper and lower inner walls of the air chamber 3.

[0028] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that; the specific embodiments of the application can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A gas detection device with tunable optical path, characterized in that, The gas detection device comprises a gas chamber for containing the gas to be detected, a light source unit and a light receiving unit are arranged at the left and right ends of the gas chamber respectively, a movable reflecting surface is arranged on the inner wall of the gas chamber near the left end of the gas chamber, the movable reflecting surface is rotationally connected with the gas chamber through an adjusting structure, the adjusting structure can adjust the angle of rotation of the movable reflecting surface, a fixed reflecting surface is fixedly arranged on the inner wall of the gas chamber between the movable reflecting surface and the right end of the gas chamber, and the light emitted by the light source unit is reflected by the movable reflecting surface and the fixed reflecting surface and then emitted to the light receiving unit.

2. The tunable optical path gas detection apparatus of claim 1, wherein, The gas detection device further comprises a main control unit, the light source unit, the light receiving unit and the adjusting structure are electrically connected with the main control unit, the main control unit can control the light source unit to emit a light beam, the main control unit can calculate the gas concentration according to the result of the light receiving unit, and the main control unit can also control the adjusting structure to adjust the included angle between the movable reflecting surface and the inner wall of the gas chamber.

3. The tunable optical path gas detection apparatus of claim 1, wherein, The light emitting components in the light source unit can be replaced to emit different light.

4. The tunable optical path gas detection apparatus of claim 3, wherein, The light emitting components are semiconductor lasers or wide spectrum light source LEDs of a distributed feedback laser.

5. The tunable optical path gas detection apparatus of claim 1, wherein, One or more movable reflecting surfaces are arranged in the gas detection device.

6. The tunable optical path gas detection apparatus of claim 1, wherein, The adjusting structure comprises a rotating shaft, the end of the connecting rod is fixedly connected with the rotating shaft, the connecting rod is arranged along the radial direction of the rotating shaft, the other end of the connecting rod is fixedly connected with the movable reflecting surface, and the rotating shaft drives the movable reflecting surface to rotate when the rotating shaft rotates.

7. The tunable optical path gas detection apparatus of claim 6, wherein, The rotating shaft is fixedly connected with the ends of two connecting rods, the two connecting rods are in the shape of "8", and the other ends of the two connecting rods are fixedly connected with the left and right sides of the movable reflecting surface respectively.

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