Detection device

Abstract

The detection device comprises a detection shell, a light source module, a detection probe and a circuit board, an optical gas chamber is arranged in the detection shell; the detection shell comprises a first reflecting surface, the first reflecting surface is located on the periphery of the optical gas chamber, and a reflecting layer is at least partially attached to the first reflecting surface; the detection shell is provided with a plurality of first vent holes, the first vent holes are in gas communication with the outside of the detection device, and the first vent holes are in gas communication with the optical gas chamber; at least part of the light source module is located in the detection shell, the light source module is electrically connected with the circuit board, and the light source module is close to the first reflecting surface relative to the detection probe; the detection probe is at least partially located in the detection shell, and the detection probe is electrically connected with the circuit board. In the detection device, at least part of the first reflecting surface is attached with the reflecting layer, so that the reflectivity of light is increased, light loss caused by diffuse reflection of light in the detection shell is reduced, and the measurement accuracy of the detection device is improved.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular, to a detection device. Background Art

[0002] Reference Fig.10 In the related art, the detection device 7 is composed of a light source module 2, a detection probe 3, a detection shell 1 and a circuit board 4, wherein the detection shell 1 includes a light source reflection cavity 91 and a focusing reflection cavity 92, the light source module is located in the light source reflection cavity 91 and is electrically connected to the circuit board 4, and the detection probe 3 is located in the focusing reflection cavity 92 and is electrically connected to the circuit board 4. It is known from the absorption properties of the medium that when light passes through the gas to be detected, part of the light is absorbed by the gas, and part of the light is scattered by the gas. The light scattered by the gas will be reflected from the light source reflection cavity 91 to the focusing reflection cavity, and then reflected from the focusing reflection cavity 92 to the detection probe 3, but the light will be diffusely reflected in the detection shell 1, causing light loss, thereby affecting the detection accuracy. Summary of the invention

[0003] In order to solve the above problems, the present application provides a detection device with high accuracy.

[0004] A detection device comprises a detection shell, a light source module, a detection probe and a circuit board;

[0005] The detection shell is provided with an optical air chamber;

[0006] The detection shell comprises a first reflective surface, the first reflective surface is located at the periphery of the optical air chamber, and a reflective layer is at least partially attached to the first reflective surface; the detection shell has a plurality of first vent holes, the first vent holes are gaseously connected to the outside of the detection device, and the first vent holes are gaseously connected to the optical air chamber;

[0007] At least a portion of the light source module is located in the detection shell, the light source module is electrically connected to the circuit board, and the light source module is close to the first reflection surface relative to the detection probe;

[0008] The detection probe is at least partially located in the detection shell, and the detection probe is electrically connected to the circuit board.

[0009] In the present application, a reflective layer is at least partially attached to the first reflective surface to increase the reflectivity of light and reduce light loss caused by diffuse reflection of light in the detection shell, thereby improving the measurement accuracy of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of the detection device of the present application;

[0011] Figure 2 yes Figure 1 Explosion diagram of

[0012] Figure 3 yes Figure 2 A three-dimensional cross-sectional schematic diagram of the detection shell;

[0013] Figure 4 yes Figure 3 A three-dimensional cutaway diagram from another perspective;

[0014] Figure 5 yes Figure 1 A schematic diagram of a first housing;

[0015] Figure 6 yes Figure 1 Schematic diagram of the detection shell, base, light source module, detection probe and circuit board;

[0016] Figure 7 yes Figure 1 Schematic diagram of the detection shell, base, light source module and detection probe;

[0017] Figure 8 It is a schematic diagram of a partial structure of a detection device viewed from above;

[0018] Fig. 9 Yes Figure 8 A schematic diagram showing the relationship between the first straight line and the second straight line;

[0019] Fig.10 is a schematic diagram of a detection device in the related art;

[0020] Fig.11 yes Figure 4 Enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0021] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0022] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] Reference Figure 1 and Figure 2The detection device 7 includes a shell 8, a light source module 2, a detection shell 1, a circuit board 4 and a detection probe 3. The detection shell 1 is preferably a straight-cylindrical type. The detection shell 1 has an optical air chamber 5. The shell 8 has an inner cavity 80 and a second vent 83. The second vent 83 is gaseously connected to the inner cavity 80, and the second vent 83 is gaseously connected to the outside of the detection device 7. The circuit board 4, the detection shell 1, the light source module 2 and the detection probe 3 are all located in the inner cavity 80. The light source module 2 is preferably an infrared light source module 2. The light source module 2 is at least partially located in the optical air chamber 5, and the light source module 2 is electrically connected to the circuit board 4; the detection probe 3 is at least partially located in the optical air chamber 5, and the detection probe 3 is electrically connected to the circuit board 4.

[0024] Reference Figure 2 The detection device 7 has a height direction H, the detection shell 1 and the circuit board 4 are distributed along the height direction H of the detection device, the detection shell 1 has a length direction and a width direction, the detection device 7 has a transverse direction W and a longitudinal direction L, the transverse direction W is parallel to the length direction of the detection shell 1, and the longitudinal direction L is parallel to the width direction of the detection shell 1.

[0025] Reference Figure 3 The detection shell 1 includes a first reflection surface 11, which is located at the periphery of the optical air chamber 5. In order to improve the measurement accuracy of the detection device 7, the first reflection surface 11 is at least partially attached with a reflection layer 19 to increase the reflectivity of the light in the optical air chamber 5 and reduce the light loss caused by diffuse reflection of the light in the detection shell 1, thereby improving the measurement accuracy of the detection device 7.

[0026] In order to further improve the measurement accuracy of the detection device 7, in some embodiments, Figure 3 As shown, the detection shell 1 includes a first wall portion 15, which is located at the periphery of the optical air chamber 5. The first wall portion 15 is at least partially attached with a reflective layer 19. Furthermore, the material of the first wall portion 15 is preferably plastic or aluminum.

[0027] In some embodiments, the reflective layer 19 includes an aluminum-plated layer or a gold-plated layer, preferably a gold-plated layer. The reflectivity of the gold-plated reflective layer 19 in the infrared band is as high as 95%, and the gold-plated reflective layer 19 has high stability. When light is irradiated onto the reflective layer 19, the reflectivity of the light increases and the diffuse reflection of the light is reduced, thereby reducing the loss of light and improving the measurement accuracy of the detection device 7.

[0028] In order to further improve the measurement accuracy of the detection device 7, in some embodiments, Figure 4As shown, the detection shell 1 is provided with a second reflection surface 12, and the second reflection surface 12 is located at the periphery of the optical air chamber 5. The first reflection surface 11 and the second reflection surface 12 are located on opposite sides of the length direction of the detection shell 1. The first reflection surface 11, the light source module 2, the detection probe 3 and the second reflection surface 12 are arranged in sequence along the transverse direction W. In this way, the light only needs to be reflected twice in the optical air chamber to reach the receiving surface of the detection probe 3, which reduces the number of reflections and correspondingly reduces the loss of light, and further improves the measurement accuracy of the detection device 7. In some embodiments, the first reflection surface 11 and the second reflection surface 12 are both arc-shaped. Further, the first reflection surface 11 and the second reflection surface 12 are preferably parabolic surfaces. The focus or center point of the first reflection surface 11 coincides with the light emission center of the light source module 2, and the focus or center point of the second reflection surface 12 coincides with the center of the receiving surface of the detection probe 3, so as to improve the utilization rate of light. Further, the second reflection surface 12 is at least partially attached with a reflection layer 19.

[0029] In some embodiments, Figure 6 As shown, the detection shell 1 includes a base 6, the base 6 includes an upper surface 66, the upper surface 66 is located at the periphery of the optical air chamber 5, and further, the upper surface 66 is at least partially attached with a reflective layer 19; the base 6 is close to the circuit board 4 relative to the optical air chamber 5, and the base 6 is matched with the detection shell 1. Specifically, the base 6 and the detection shell 1 can be matched by extrusion, welding or gluing; in some embodiments, such as Figure 7 As shown, the detection shell 1 is provided with a second hole groove 17, and the second hole groove 17 is arranged along the inner wall of the detection shell 1. The second hole groove 17 is close to the circuit board 4 relative to the first ventilation hole 13, and the base 6 is at least partially located in the second hole groove 17. Specifically, the base 6 and the second hole groove 17 are transitionally fitted or interference fit so as to determine the position of the detection shell 1 and the base 6. The base 6 has a first through hole 61 and a second through hole 62, and the first through hole 61 and the second through hole 62 both penetrate the base 6 along the height direction H. The light source module 2 is at least partially located in the first through hole 61. Specifically, the light source module 2 is gap-matched with the hole wall of the first through hole 61, or a circle of soft pad is glued to the hole wall of the first through hole 61, and the light source module 2 is then matched with the hole wall of the first through hole 61. The light source module 2 is provided with a first pin 21, and the circuit board 4 has a first corner hole 42. The light source module 2 can be electrically connected to the circuit board 4 by soldering the first pin 21 and the first corner hole 42; the detection probe 3 is at least partially located in the second through hole 62. Specifically, the detection probe 3 can be matched with the second through hole 62 by extrusion, welding or gluing. The detection probe 3 is provided with a second pin 33, and the circuit board 4 has a second corner hole 43. The detection probe 3 can be electrically connected to the circuit board 4 by soldering the second pin 33 and the second corner hole 43.

[0030] In some embodiments, Fig.11 As shown, Fig.11 yes Figure 4 Part A is an enlarged schematic diagram, in which the first reflecting surface 11 , the second reflecting surface 12 , the first wall portion 15 and the upper surface 66 are all attached with a reflecting layer 19 .

[0031] In some embodiments, Figure 7 As shown, the second through hole 62 includes a first hole groove 63, the first hole groove 63 and the second through hole 62 are coaxially arranged, and the first hole groove 63 is connected to the second through hole 62, and the detection probe 3 is provided with a second step 32, and the second step 32 is at least partially located in the first hole groove 63. Specifically, the second step 32 and the first hole groove 63 can be matched by extrusion, welding or gluing to determine the position of the detection probe 3 and the second through hole 62.

[0032] In some embodiments, Figure 7 As shown, the detection shell 1 has a first notch 16, which is recessed from the side wall of the first hole groove 63 in a direction away from the first hole groove 63, and the base 6 has a second notch 64, which is recessed from the side wall of the first hole groove 63 in a direction away from the first hole groove 63, and the second notch 64 is connected to the first hole groove 63; the second step 32 is also provided with a first protrusion 31, the first protrusion 31 is connected to the second step 32, the first protrusion 31 is protruded from the side wall of the second step 32 in a direction away from the second step 32, the first protrusion 31 is at least partially located in the second notch 64, the first protrusion 31 cooperates with the second notch 64, and further determines the position of the detection probe 3 and the second through hole 62, specifically, the second step 32 is sealed and connected to the hole wall of the first hole groove 63 or gap-fitted, or connected with a sealant.

[0033] In some embodiments, Figure 7 As shown, the base 6 has a second protrusion 65, which protrudes from the side wall of the base 6 in a direction away from the side wall of the base 6. The second protrusion 65 is close to the second reflecting surface 12 relative to the first reflecting surface 11, or the second protrusion 65 is close to the first reflecting surface 11 relative to the second reflecting surface 12, and the second protrusion 65 is matched and connected with the first notch 16.

[0034] In some embodiments, Figure 2 As shown, the detection shell 1 is provided with a first positioning portion 14, and the first positioning portion 14 is close to the circuit board 4 relative to the optical air chamber 5. Preferably, the number of the first positioning portions 14 is four. Specifically, the shape of the first positioning portion 14 is cylindrical or strip-shaped. Along the height direction H, the first positioning portion 14 protrudes outward from the side of the detection shell 1 facing the circuit board 4. The circuit board 4 has a first positioning hole 41. The detection shell 1 and the circuit board 4 are connected by welding, plugging or screwing the first positioning portion 14 and the first positioning hole 41.

[0035] In order to improve the detection accuracy of the detection device 7, the detection device 7 also includes a waterproof and breathable membrane 18 to prevent impurities such as moisture or dust from entering the detection shell 1 to affect the detection accuracy. In some embodiments, refer to Figure 1 and Figure 2 As shown, the detection shell 1 has a first vent 13 and an optical air chamber 5, the first vent 13 is gaseously connected to the outside of the detection device 7, the first vent 13 is gaseously connected to the optical air chamber 5, the first vent 13 is gaseously connected to the inner cavity 80, the first vent 13 and the second vent 83 are at least partially aligned, a waterproof breathable membrane 18 is arranged between the first vent 13 and the second vent 83, the waterproof breathable membrane 18 covers the first vent 13, the waterproof breathable membrane 18 may include a waterproof breathable porous material attached to a polyester fiber fabric processed by a specific process, the pore size of which is at the nanometer level, so that it can play a role of waterproof, dustproof and breathable, and the use of the waterproof breathable membrane 18 also extends the service life of the product. The waterproof breathable membrane 18 can cover the first vent 13 by pasting, specifically, preferably four first vents 13, and the four first vents 13 are arranged in sequence on the detection shell 1 along the lateral direction W of the detection device 7.

[0036] In some embodiments, reference Figure 2 as well as Figure 5 As shown, the second shell 82 is provided with a plurality of second positioning portions 821, the circuit board 4 has a plurality of second positioning holes 44, the second positioning portions 821 cooperate with the second positioning holes 44 to fix the circuit board 4, the second shell 82 has a second inner cavity 822, and the circuit board 4 is at least partially located in the second inner cavity 822. Specifically, four second positioning portions 821 and four second positioning holes 44 are preferred. In some embodiments, the first shell 81 has a first inner cavity 811 and a top surface 84, the first inner cavity 811 is connected to the second inner cavity 822, the first inner cavity 811 and the second inner cavity 822 form an inner cavity 80, the top surface 84 is away from the circuit board 4 relative to the first inner cavity 811, the top surface 84 has a plurality of second vents 83, the second vents 83 are in gas communication with the first inner cavity 811, and the second vents 83 are in gas communication with the outside of the detection device 7, the shell 8 has a protective effect on the detection device 7, so that the detection device 7 is not easily affected and damaged by the external environment during detection.

[0037] The principle of the entire detection device 7 is explained as follows. Different gases have different absorption spectra due to differences in their molecular structure, concentration and energy distribution. When detecting the target gas, the absorption of the target gas to the light of the characteristic wavelength conforms to the Lambert-Beer law. Taking the light source module 2 as an infrared light source as an example, when the light source module 2 emits an infrared beam through the optical air chamber 5 to reach the detection probe 3, the target gas will absorb infrared rays of a specific wavelength. In other words, the target gas leaked from the outside will enter the inner cavity 80 through the second vent 83 structure of the outer shell 8, and then enter the optical air chamber 5 through the first vent 13 on the detection shell 1. The target gas entering the optical air chamber 5 will absorb infrared light of a characteristic wavelength. In this way, the detection probe 3 can calculate the concentration and other information of the target gas by detecting the change in light intensity.

[0038] In order to improve the detection accuracy of the detection device 7, in some embodiments, the detection shell 1 needs to ensure a certain length. In order to increase the length of the detection shell 1 in a confined space, in this application, reference is made to Figure 8 As shown, a first straight line X1 and a second straight line X2 are defined on a first plane M perpendicular to the height direction H of the detection device 7. The detection shell 1 has a first projection S1 on the first plane M, and the first straight line X1 extends along the length direction of the first projection S1. The second straight line X2 extends along the width direction or the length direction of the detection device 7, referring to Fig. 9 As shown, the width direction of the detection device 7 can refer to the P2 direction, and the length direction of the detection device 7 can refer to the P1 direction. Fig. 9 The second straight line X2 has the same extension direction as the center line of the width direction of the detection device 7. The first straight line X1 is tilted at an acute angle β relative to the second straight line X2. This is conducive to expanding the installation space of the detection shell 1, and correspondingly, it is also conducive to extending the distance between the light source module 2 and the detection probe 3. In this way, through a longer optical path, the gas can absorb infrared light more fully, which is conducive to improving the detection accuracy of the detection device 7.

[0039] The assembly of the detection device 7 comprises the following steps:

[0040] The base 6 and the detection shell 1 can be assembled by extrusion to form an optical air chamber 5;

[0041] The pin 21 of the light source module 2 cooperates with the first corner hole 42 of the circuit board 4, so that the light source module 2 is electrically connected to the circuit board 4, and the light source module 2 is at least partially inserted into the first through hole 61;

[0042] The second pin 33 of the detection probe 3 is soldered to the second corner hole 43 of the circuit board 4, so that the detection probe 3 is electrically connected to the circuit board 4, the detection probe 3 is at least partially located in the second through hole 62, and the second step 32 of the detection probe 3 is at least partially placed in the first hole groove 63, so that the first protrusion 31 of the second step 32 is located at the notch 64;

[0043] The detection shell 1 together with the light source module 2, the detection probe 3 and the base 6 are integrally mounted on the circuit board 4, and then the entirety is mounted in the outer shell, from the inside to the outside, so that the installation is more convenient.

[0044] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A detection device, characterized in that: It includes a detection shell, a light source module, a detection probe and a circuit board; The detection shell is provided with an optical air chamber; The detection shell comprises a first reflective surface, the first reflective surface is located at the periphery of the optical air chamber, and a reflective layer is at least partially attached to the first reflective surface; the detection shell has a plurality of first vent holes, the first vent holes are gaseously connected to the outside of the detection device, and the first vent holes are gaseously connected to the optical air chamber; At least a portion of the light source module is located in the detection shell, the light source module is electrically connected to the circuit board, and the light source module is close to the first reflection surface relative to the detection probe; The detection probe is at least partially located in the detection shell, and the detection probe is electrically connected to the circuit board.

2. The detection device according to claim 1, characterized in that: The detection shell includes a first wall portion, the first wall portion is located at the periphery of the optical air chamber, and a reflective layer is at least partially attached to the first wall portion. The reflective layer includes one or more of an aluminum-plated layer and a gold-plated layer.

3. The detection device according to claim 1, characterized in that: The detection shell is provided with a second reflecting surface, and the second reflecting surface is located at the periphery of the optical air chamber. The detection shell has a length direction, and the first reflecting surface and the second reflecting surface are located on opposite sides of the length direction of the detection shell. The second reflecting surface is at least partially attached with a reflecting layer, and the first reflecting surface, the light source module, the detection probe and the second reflecting surface are arranged in sequence along the length direction of the detection shell.

4. The detection device according to claim 3, characterized in that: The detection shell includes a base, the base includes an upper surface, the upper surface is located at the periphery of the optical air chamber, a reflective layer is at least partially attached to the upper surface, the base is close to the circuit board relative to the optical air chamber, the base has a first through hole and a second through hole, the first through hole and the second through hole both pass through the base, the light source module is at least partially located in the first through hole, and the detection probe is at least partially located in the second through hole.

5. The detection device according to claim 4, characterized in that: The detection probe is provided with a second step, the second step is provided with a first protrusion, the base has a first hole groove and a second notch, the first hole groove is coaxially arranged with the second through hole, and the first hole groove is connected with the second through hole, the second notch is connected with the first hole groove, the second step is connected with the hole wall of the first hole groove, and the first protrusion cooperates with the second notch.

6. The detection device according to claim 1, characterized in that: A plane perpendicular to the height direction of the detection device is defined as a first plane, and a first straight line and a second straight line are provided on the first plane; the detection shell has a first projection on the first plane, and the first straight line extends along the length direction of the first projection; The second straight line extends along the width direction or the length direction of the detection device; the first straight line is inclined at an acute angle relative to the second straight line.

7. The detection device according to claim 1, characterized in that: The detection shell is provided with a plurality of first positioning parts, the first positioning parts are close to the circuit board relative to the optical air chamber, the circuit board has a first positioning hole, and the detection shell and the circuit board are connected with each other through the first positioning parts and the first positioning holes.

8. The detection device according to claim 4, characterized in that: The base is provided with a second protrusion, and the second protrusion is close to the second reflecting surface relative to the first reflecting surface; Or the second protrusion is closer to the first reflecting surface relative to the second reflecting surface, the detection shell is provided with a first notch, the first notch is communicated with the optical air chamber, and the second protrusion matches with the first notch.

9. The detection device according to claim 4, characterized in that: The detection shell is provided with a second hole groove, the second hole groove is closer to the circuit board relative to the first ventilation hole, and the second hole groove is matched with the base.

10. The detection device according to any one of claims 1 to 9, characterized in that: The detection device includes a shell, the shell has an inner cavity, the circuit board and the detection shell are both located in the inner cavity, the shell has a second ventilation hole, the second ventilation hole is connected to the inner cavity, the first ventilation hole is connected to the inner cavity gas, the second ventilation hole and the first ventilation hole are at least partially aligned, the detection device also includes a waterproof breathable membrane, the waterproof breathable membrane is arranged between the first ventilation hole and the second ventilation hole, and the waterproof breathable membrane covers the first ventilation hole.

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