Infrared spectrum gas detection tube and alcohol detector

Abstract

The embodiment of the utility model provides an infrared spectrum gas detection tube. The infrared spectrum gas detection tube comprises a hollow tube, a sheet element and an adhesive layer, a gas inlet and a gas outlet which are communicated with the internal space of the hollow pipe are formed in the hollow pipe, and the gas inlet, the internal space and the gas outlet are communicated to form a gas flow channel through which detected gas passes; the sheet-shaped element comprises a reflective surface and a pasting surface which are oppositely arranged, and further comprises a first side edge and a second side edge which are oppositely arranged, and a third side edge and a fourth side edge which are oppositely arranged. The pasting surface of the sheet-shaped element is pasted and fixed on the inner surface of the hollow pipe through the adhesive layer, the sheet-shaped element forms a cylindrical structure with two open ends in the inner space of the hollow pipe, and a seam is formed on the side wall of the cylindrical structure; the first side edge and the second side edge are located at the two ends of the cylindrical structure respectively, the seam is formed between the third side edge and the fourth side edge, and the third side edge and the fourth side edge are not overlapped.

Description

Technical Field

[0001] This application relates to the field of infrared spectroscopy gas detection, and more particularly to an infrared spectroscopy gas detection tube and an alcohol detector. Background Technology

[0002] In organic molecules, the atoms that make up chemical bonds or functional groups are in a state of constant vibration, and their vibrational frequencies are comparable to those of infrared light. When organic molecules are irradiated with infrared light, the chemical bonds or functional groups in the molecules undergo vibrational absorption. Different chemical bonds or functional groups absorb at different frequencies and will be located at different positions on the infrared spectrum. Therefore, information about the types of chemical bonds or functional groups contained in the molecule can be obtained through infrared spectroscopy, allowing analysis of the organic composition and content in the sample. Infrared spectral alcohol testers utilize this principle to detect the alcohol content in exhaled breath. Infrared spectral alcohol testers have advantages such as stability, strong anti-interference ability, and high detection accuracy, and can be directly used as evidence for law enforcement, eliminating the need for the previous blood test procedure.

[0003] An existing infrared spectroscopy detection tube, such as Figure 1 As shown, the device includes a metal tube 10, an air inlet 13, an air outlet 14, an infrared emitter 2, and an infrared receiver 15. The infrared emitter 2 and the infrared receiver 15 are respectively located at both ends of the metal tube 10. The air inlet 13 and the air outlet 14 are respectively located at both ends of the metal tube 10 and communicate with the internal space of the metal tube 10. The air inlet 13, the metal tube 10, and the air outlet 14 are connected to form a channel for the gas to be measured to pass through. When testing is performed, the gas to be measured is introduced into the air inlet 13, flows through the internal space of the metal tube 10, and then flows out from the air outlet 14. The infrared light emitted by the infrared emitter 2 passes through the gas to be measured in the metal tube 10 and is received by the infrared receiver 15. The composition and concentration of the gas to be measured can be analyzed based on the light signal received by the infrared receiver 15. The metal tube 10 also contains a reflective layer formed by methods such as polishing, electroplating, or chemical deposition, which reflects infrared light emitted by the infrared emitter 2, ensuring that the infrared light emitted by the infrared emitter 2 is received by the infrared receiver 15 as much as possible, thereby improving the sensitivity and accuracy of gas detection. However, due to the slender shape of the metal tube 10 and its small internal space, forming a reflective layer inside the metal tube 10 by methods such as polishing, electroplating, or chemical deposition is difficult and costly.

[0004] To solve the above technical problems, in another existing infrared spectroscopy detection tube, such as... Figure 2As shown, it includes a hollow tube 20, a flexible optical component 1, an infrared emitter 21, and an infrared receiver 22. The hollow tube 20 has openings 20a / 20b at both ends, and two connecting pipes 23a / 23b are respectively provided on the sidewalls near both ends, connecting to its interior. The internal space of the hollow tube 20 and the two connecting pipes 23a / 23b form a channel for the gas to be measured to flow. The flexible optical component 1 includes a light-reflecting layer, a hanging layer, and a support member. The flexible optical component 1 is wound inside the hollow tube 20, and the wound flexible optical component 1 has an unfolding tendency, thus abutting against the inner sidewall of the hollow tube 20 without the need for mechanical fixing or... The flexible optical component 1 is fixed to the hollow tube 20 by pasting. The light-reflecting layer is located on the side of the flexible optical component 1 away from the inner wall of the hollow tube 20. The infrared emitter 21 and the infrared receiver 22 are respectively disposed at both ends of the hollow tube 20. The infrared light emitted by the infrared emitter 21 passes through the gas to be measured flowing inside the hollow tube 20 and is received by the infrared receiver 22. The alcohol concentration of the gas to be measured can be obtained by analyzing the spectrum of the infrared light received by the infrared receiver 22. The light-reflecting layer is used to reflect the infrared light emitted by the infrared emitter 21, so that more infrared light can be received by the infrared receiver 22, thereby improving the accuracy and sensitivity of alcohol concentration detection. Thus, the reflective layer is formed by the flexible optical component 1 installed inside the hollow tube 20, eliminating the need to directly process the reflective layer on the inner wall of the hollow tube 20, reducing the difficulty of the process and the manufacturing cost.

[0005] Because the elasticity formed by the flexible optical component 1 after being rolled up is not strong and is not uniform, it is difficult for it to completely fit the inner wall of the hollow tube 20. A gap may be formed between the flexible optical component 1 and the inner wall of the hollow tube 20. The gas to be measured remaining in the gap will affect the detection of alcohol concentration and lead to a decrease in the accuracy of concentration detection. For example, if the alcohol concentration detected in the previous test was high and the alcohol concentration detected in this test is low, the high concentration gas detected in the previous test may remain in the gap, which may lead to an overestimation of the alcohol concentration detected in this test.

[0006] In order to reduce the gap between the flexible optical component 1 and the hollow tube 20, in this prior art, the number of turns of the flexible optical component 1 is greater than 1 turn, that is, the two sides of the flexible optical component 1 overlap at least partially, so that the flexible optical component 1 is subjected to more uniform force, and the flexible optical component 1 and the inner wall of the hollow tube 20 can fit more fully, thereby reducing the gap between the flexible optical component 1 and the hollow tube 20.

[0007] However, the number of turns of the flexible optical component 1 is greater than one. Although it can solve the problem of the gap between the flexible optical component 1 and the inner wall of the hollow tube 20 to a certain extent, it cannot completely solve the problem. There will still be a gap between the flexible optical component 1 and the inner wall of the hollow tube 20, and gaps will also be formed between the overlapping flexible optical components 1. The gas to be measured can easily enter the gaps and affect the detection.

[0008] On the other hand, the flexible optical component 1 is fixed by its own unfolding tendency to fit against the inner wall of the hollow tube 20. This fixing method is not strong enough. Especially when there is vibration or thermal expansion and contraction at high and low temperatures, or as the usage time increases, the flexible optical component 1 is prone to deformation and loosening, which will affect normal detection. Utility Model Content

[0009] To address the above technical problems, this application provides an infrared spectral gas detection tube and an alcohol detector.

[0010] This application provides an infrared spectroscopy gas detection tube, comprising a hollow tube, a sheet element, and an adhesive layer;

[0011] The hollow tube is provided with an air inlet and an air outlet communicating with its internal space. The air inlet, the internal space and the air outlet are connected to form an airflow channel for the gas to be measured to pass through.

[0012] The sheet-like element includes a reflective surface and an adhesive surface arranged opposite to each other, and also includes a first side, a second side, a third side, and a fourth side arranged opposite to each other. The adhesive surface of the sheet-like element is bonded and fixed to the inner surface of the hollow tube by the adhesive layer. The sheet-like element forms a cylindrical structure with open ends in the internal space of the hollow tube, and a seam is formed on the side wall of the cylindrical structure. The first side and the second side are respectively located at the two ends of the cylindrical structure, and the seam is formed between the third side and the fourth side. The third side and the fourth side do not overlap.

[0013] In one optional embodiment of this application, the width of the seam is greater than 0.

[0014] In one optional embodiment of this application, the width of the seam is 0.

[0015] In one optional embodiment of this application, the sheet element includes a stacked substrate layer and a reflective material layer, wherein the side of the substrate layer away from the reflective material layer forms the adhesive surface, and the side of the reflective material layer away from the substrate layer forms the reflective surface.

[0016] In one optional embodiment of this application, the substrate layer is made of copper or aluminum, and the reflective material layer is made of gold.

[0017] In one optional embodiment of this application, each area on the adhesive surface of the sheet element is directly bonded and fixed to the inner surface of the hollow tube by the adhesive layer.

[0018] In one optional embodiment of this application, the adhesive layer is a UV adhesive layer; the wall of the hollow tube is used to allow ultraviolet light to pass through.

[0019] In one optional embodiment of this application, a heating element is further included, which is disposed on the outer surface of the hollow tube.

[0020] This application provides an alcohol detector, comprising:

[0021] An infrared gas detection tube, wherein the infrared gas detection tube is the infrared gas detection tube in any of the above embodiments;

[0022] A first detection element is disposed at the first end of the hollow tube;

[0023] A second detection element is disposed at the second end of the hollow tube;

[0024] One of the first detection element and the second detection element is an infrared transmitter and the other is an infrared receiver.

[0025] Beneficial effects:

[0026] In this embodiment, the adhesive surface of the sheet element in the infrared spectroscopy gas detection tube is fixed to the inner surface of the hollow tube by an adhesive layer, eliminating gaps between the sheet element and the inner surface of the hollow tube. This effectively prevents the gas to be measured inside the hollow tube from entering between the hollow tube and the sheet element, improving detection accuracy. Compared to existing technologies that directly process the reflective layer on the inner surface of the hollow tube, this solution has lower processing costs. Furthermore, compared to existing technologies that utilize the elasticity formed by the curling of flexible optical components to fix them inside the hollow tube, this embodiment connects the inner surface of the hollow tube and the adhesive surface of the sheet element with an adhesive layer, ensuring that the sheet element fixed to the inner surface of the hollow tube is less prone to deformation and loosening.

[0027] The third and fourth sides of the sheet element do not overlap, meaning that the sheet element does not overlap at any position on the inner surface of the hollow tube. In other words, the number of turns of the sheet element inside the hollow tube is less than or equal to one turn. The sheet element is a cylindrical structure with open ends, and seams are formed on the side walls of the cylindrical structure. This avoids the sheet element overlapping on the inner surface of the hollow tube and forming gaps, and avoids the gaps formed at the overlapping positions of the flexible optical components in the prior art. It effectively prevents the gas to be measured located inside the hollow tube from entering between the hollow tube and the sheet element, thus improving the detection accuracy. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0030] Figure 1 This is a cross-sectional view of an infrared spectroscopy detection tube in the prior art.

[0031] Figure 2 This is a cross-sectional view of another infrared spectroscopy detection tube in the prior art.

[0032] Figure 3 This is a longitudinal cross-sectional view of the infrared spectroscopy gas detection tube of this utility model.

[0033] Figure 4 This is a longitudinal cross-sectional view of the infrared spectroscopy gas detection tube of this utility model.

[0034] Figure 5 This is a cross-sectional view of the infrared spectroscopy gas detection tube of this utility model.

[0035] Figure 6 This is a three-dimensional view of the reflective layer in the infrared spectroscopy gas detection tube of this utility model.

[0036] Figure 7 This is another perspective view of the reflective layer in the infrared spectroscopy gas detection tube of this utility model.

[0037] Figure 8 This is a cross-sectional view of the reflective layer in the infrared spectroscopy gas detection tube of this utility model.

[0038] Figure 9 This is a longitudinal sectional view of the alcohol detector of this utility model.

[0039] In the picture:

[0040] 10. Infrared spectroscopy gas detection tube; 11. First end; 12. Second end; 101. First channel; 102. Second channel; 103. Third channel; 104. First through hole; 105. Second through hole;

[0041] 100. Hollow tube; 110. First connecting part; 120. Second connecting part; 130. Tube body; 131. Air inlet; 132. Air outlet; 133. Internal space; 100a. Inner surface; 100b. Outer surface;

[0042] 200, Sheet element; 201, Cylindrical structure; 210, Side wall; 211, First side edge; 212, Second side edge; 213, Third side edge; 214, Fourth side edge; 220, Seam; 230, Substrate layer; 240, Opening; 241, First opening; 242, Second opening; 250, Reflective material layer; 260, End; 200a, Reflective surface; 200b, Adhesive surface;

[0043] 300, Adhesive layer;

[0044] 400. Heating element;

[0045] 1000. Alcohol testing device. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0047] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] like Figures 3-8As shown, this utility model embodiment provides an infrared spectral gas detection tube 10, including a hollow tube 100, a sheet element 200 and an adhesive layer 300. The hollow tube 100 is provided with an air inlet 131 and an air outlet 132 communicating with its internal space 133. The air inlet 131, the internal space 133 and the air outlet 132 are connected to form an airflow channel for the gas to be measured. The sheet element 200 includes a reflective surface 200a and an adhesive surface 200b arranged opposite to each other. The sheet element 200 also includes a first side 211, a second side 212, a third side 213, and a fourth side 214 arranged opposite to each other. The adhesive surface 200b of the sheet element 200 is bonded and fixed to the inner surface 100a of the hollow tube 100 by an adhesive layer 300. The sheet element 200 forms a cylindrical structure 201 with openings 240 at both ends 260 in the internal space 133 of the hollow tube 100. A seam 220 is formed on the side wall 210 of the cylindrical structure 201. The first side 211 and the second side 212 are located at the two ends 260 of the cylindrical structure 201, respectively. The seam 220 is formed between the third side 213 and the fourth side 214, and the third side 213 and the fourth side 214 do not overlap.

[0049] Thus, the adhesive surface 200b of the sheet element 200 in the infrared spectroscopy gas detection tube 10 is fixed to the inner surface 100a of the hollow tube 100 by the adhesive layer 300, so that there is no gap between the sheet element 200 and the inner surface 100a of the hollow tube 100, effectively preventing the gas to be measured located inside the hollow tube 100 from entering between the hollow tube 100 and the sheet element 200, thereby improving detection accuracy. Compared with the prior art of directly forming a reflective layer on the inner surface of the hollow tube, the processing cost of this technical solution is lower. Compared with the prior art of using the elasticity formed by the curling of flexible optical components to fix the flexible optical components inside the hollow tube, the embodiment of this application connects the inner surface 100a of the hollow tube 100 and the adhesive surface 200b of the sheet element 200 through the adhesive layer 300, ensuring that the sheet element 200 fixed on the inner surface 100a of the hollow tube 100 is not easily deformed or loosened.

[0050] Furthermore, the third side 213 and the fourth side 214 of the sheet element 200 do not overlap, meaning that the sheet element 200 does not overlap at any position on the inner surface 200a of the hollow tube 100. In other words, the number of turns of the sheet element 200 within the hollow tube 100 is less than or equal to one turn. The sheet element 200 is a cylindrical structure 201 with openings 240 at both ends 260, and a seam 220 is formed on the sidewall 210 of the cylindrical structure 201. This avoids the sheet element 200 overlapping on the inner surface 100a of the hollow tube 100 and forming gaps, thus avoiding the gaps formed at the overlapping positions due to the self-overlapping of flexible optical components in the prior art. This effectively prevents the gas to be measured located inside the hollow tube 100 from entering between the hollow tube 100 and the sheet element 200, thereby improving the detection accuracy.

[0051] like Figure 6 and Figure 7 As shown, the cylindrical structure 201 has two ends 260, that is, the cylindrical structure 201 has two ends 260, which are opposite to each other. The ends 260 of the cylindrical structure 201 can also be referred to as end points. In the embodiment of this application, the first side 211 of the sheet element 200 is located at one end 260 of the cylindrical structure 201, and the second side 212 of the sheet element 200 is located at the other end 260 of the cylindrical structure 201. In an optional embodiment of this application, the two ends 260 of the cylindrical structure 201 are parallel to each other, that is, the first side 211 and the second side 212 are parallel to each other.

[0052] The cylindrical structure 201 has openings 240 at both ends 260, namely a first opening 241 and a second opening 242. The first opening 241 is located at one end 260 of the cylindrical structure 201, and the second opening 242 is located at the other end 260 of the cylindrical structure 201. It can be understood that the first opening 241 can be formed by a first side 211, and the second opening 242 can be formed by a second side 212. It can also be understood that the first opening 241 and the second opening 242 are interconnected.

[0053] For example, such as Figure 4 and Figure 6 As shown, the width of seam 220 is greater than 0, meaning that the third side 213 and the fourth side 214 are spaced apart and do not abut against each other. Therefore, seam 220 is formed by the third side 213 and the fourth side 214 together creating a gap. It is understood that the width and shape of seam 220 can be set according to actual needs, and will not be illustrated further here.

[0054] For example, such as Figure 5 and Figure 7 As shown, the width of the seam 220 is 0, meaning that the third side 213 and the fourth side 214 abut against each other. The seam 220 can be understood as the abutting surface formed after the third side 213 and the fourth side 214 abut against each other. In one case, the third side 213 and the fourth side 214 abut directly. In another case, the third side 213 and the fourth side 214 abut against each other through a portion of the adhesive layer 300.

[0055] In other alternative embodiments, the width of a portion of the seam 220 is greater than 0, and the width of another portion of the seam 220 is equal to 0. Specifically, the seam 220 is divided into at least two portions, the width of at least one portion of the seam 220 is greater than 0, and the width of at least one portion of the seam 220 is equal to 0.

[0056] It should be noted that the above are several exemplary descriptions of the relationship between the third side 213 and the fourth side 214 in the embodiments of this application, and the non-overlapping relationship between the third side 213 and the fourth side 214 is not limited to this.

[0057] For example, such as Figures 3-5 As shown, each area on the bonding surface 200b of the sheet element 200 is directly bonded and fixed to the inner surface 100a of the hollow tube 100 by the adhesive layer 300. Alternatively, each area on the side wall 210 of the cylindrical structure 201 is directly bonded and fixed to the inner surface 100a of the hollow tube 100. This ensures that the area between the bonding surface 200b of the sheet element 200 and the inner surface 100a of the hollow tube 100 is completely filled with the adhesive layer 300, eliminating gaps. This effectively prevents the gas to be measured inside the hollow tube 100 from entering between the hollow tube 100 and the sheet element 200, improving detection accuracy. Simultaneously, it ensures the connection stability between the sheet element 200 and the hollow tube 100, preventing the sheet element 200 from deforming or loosening.

[0058] It should be noted that in other optional embodiments, or in other possible ways, a portion of the adhesive surface 200b of the sheet element 200 is bonded and fixed to the inner surface 100a of the hollow tube 100 by the adhesive layer 300. Specifically, the adhesive layer 300 at least adheres to the edge area of ​​the sheet element 200, that is, the adhesive layer 300 at least bonds and fixes the edge area of ​​the sheet element 200 to the inner surface 100 of the hollow tube 100. Similarly, it can also prevent the gas to be measured inside the hollow tube 100 from entering between the hollow tube 100 and the sheet element 200.

[0059] For example, such as Figure 8 As shown, the sheet element 200 includes a stacked substrate layer 230 and a reflective material layer 250. The side of the substrate layer 230 away from the reflective material layer 250 forms the adhesive surface 200b, and the side of the reflective material layer 250 away from the substrate layer 230 forms the reflective surface 200a. In this embodiment, the sheet element 200, or cylindrical structure 201, has a reflective material layer 250 and a substrate layer 230 fixedly connected to the reflective material layer 250, which increases the strength of the sheet element 200, or cylindrical structure 201, facilitating the adhesion of the sheet element 200 to the inner surface 100a of the hollow tube 100. The reflective material layer 250 is used to reflect infrared light.

[0060] In one optional embodiment of this application, the substrate layer 230 is made of copper or aluminum, and the reflective material layer 250 is made of gold. Specifically, gold can be electroplated onto the surface of copper or aluminum foil to obtain the sheet element 200. Gold, as the reflective material layer 250, has the advantage of corrosion resistance. It is understood that gold is generally electroplated onto the surface of conductive materials. Therefore, in this embodiment, the substrate layer 230 is selected as copper or aluminum, and gold is electroplated onto the surface of copper or aluminum to form the sheet element 200, thereby providing corrosion resistance to the sheet element 200. In other embodiments, the substrate layer 230 can also be a flexible PCB, and the reflective material layer 250 can also be silver, copper, aluminum, or other materials capable of reflecting infrared light. It is understood that when the substrate layer 230 and the reflective material layer 250 are made of the same material, the substrate layer 230 and the reflective material layer 250 can be combined into a single material layer, and the functions of the substrate layer 230 and the reflective material layer 250 can be achieved through the same material layer.

[0061] For example, the adhesive layer 300 is a UV adhesive layer, and the tube wall of the hollow tube 100 is used to allow ultraviolet light to pass through. In an optional embodiment of this application, the hollow tube 100 is made of a material such as quartz glass that can transmit ultraviolet light, and the sheet element 200 is attached to the inner surface 100a of the hollow tube 100 by the UV adhesive layer. During assembly, UV adhesive is first applied to the inner surface 100a of the hollow tube 100 and / or the bonding surface 200b of the sheet element 200. Then, the sheet element 200 is bonded to the inner surface 100a of the hollow tube 100. The position of the sheet element 200 can be selectively adjusted to ensure it fully adheres to the inner surface 100a of the hollow tube 100. Finally, ultraviolet light is irradiated on the outside of the hollow tube 100. The ultraviolet light passes through the tube wall of the hollow tube 100 and irradiates the UV adhesive layer to cure the UV adhesive layer. The cured UV adhesive layer firmly bonds the sheet element 200 to the inner surface 100a of the hollow tube 100. Before the UV adhesive layer cures, its viscosity is low. Therefore, after the sheet element 200 is pasted onto the inner surface 100a of the hollow tube 100 and before irradiation with ultraviolet light, the position of the sheet element 200 can be adjusted as needed to ensure that it fully adheres to the inner surface 100a of the hollow tube 100. After the UV adhesive layer is cured by irradiation with ultraviolet light, the UV adhesive layer can firmly adhere the sheet element 200 to the inner surface 100a of the hollow tube 100 to avoid deformation and loosening.

[0062] When the temperature and humidity of the gas being measured are high, water vapor in the gas may condense inside the hollow tube 100, forming small water droplets (fogging) on ​​the sheet element 200. This reduces the reflectivity of the sheet element 200, and in severe cases, water may even accumulate inside the hollow tube 100, affecting the normal operation of the infrared spectroscopy gas detection tube 10. To prevent water vapor condensation, the hollow tube 100 also includes a heating element 400 disposed on the outside of the hollow tube 100 to heat the gas flowing through the hollow tube 100 to above the dew point temperature, thus preventing water vapor in the gas from condensing inside the hollow tube 100 and affecting gas concentration detection. The heating element 400 can be a heating wire, an electric heating film, etc. For example, the heating element 400 is disposed on the outer surface 100b of the hollow tube 100.

[0063] In one alternative embodiment of this application, an insulating material may also be provided on the outer side of the heating element 400 to reduce heat loss.

[0064] For example, such as Figure 3 As shown, the hollow tube 100 includes a tube body 130, and further includes a first channel 101 radially penetrating the tube wall of the tube body 130, a second channel 102 radially penetrating the tube wall of the tube body 130, and a third channel 103 axially penetrating the tube body 130, the third channel 103 connecting the first channel 101 and the second channel 102. In an optional embodiment of this application, the internal space 133 of the hollow tube 100 can be understood as the third channel 103 of the hollow tube 100.

[0065] For example, such as Figure 3 As shown, the infrared spectroscopy gas detection tube 10 also includes a first through hole 104 and a second through hole 105 that radially penetrate the sheet element 200 and the adhesive layer 300 along the tube body 130. The first through hole 104 corresponds to and is connected to the first channel 101, the second through hole 105 corresponds to and is connected to the second channel 102, and the third channel 103 connects the first through hole 104 and the second through hole 105 to avoid the sheet element 200 and the adhesive layer 300 from obstructing the airflow.

[0066] For example, the size of the first through hole 104 is greater than or equal to the size of the opening at the end where the first channel 101 connects to the third channel 103, and the size of the second through hole 105 is greater than or equal to the size of the opening at the end where the second channel 102 connects to the third channel 103, so as to prevent the sheet element 200 and the adhesive layer 300 from obstructing the airflow. In other optional embodiments of this application, both the first through hole 104 and the second through hole 105 can be replaced by a notch, which can also prevent the sheet element 200 and the adhesive layer 300 from obstructing the airflow.

[0067] In one alternative embodiment of this application, such as Figure 3As shown, the hollow tube 100 further includes a first connecting portion 110 and a second connecting portion 120, which are connected to both ends of the tube body 130. A first channel 101 penetrates the tube wall of the tube body 130 and the first connecting portion 110 radially, and a second channel 102 penetrates the tube wall of the tube body 130 and the second connecting portion 120 radially. The air inlet 131 of the hollow tube 100 is located at the end of the first connecting portion 110 away from the tube body 130, and the air outlet 132 is located at the end of the second connecting portion 120 away from the tube body 130. In other optional embodiments of this application, the hollow tube 100 does not include the first connecting portion 110 and the second connecting portion 120, and the air inlet 131 and the air outlet 132 are directly disposed on the tube body 130.

[0068] For example, such as Figure 3 As shown, the two ends of the hollow tube 100 may include a first end 11 and a second end 12, which are arranged opposite to each other. The first end 11 and the second end 12 can also be understood as the two ends of the third channel 103 of the hollow tube 100.

[0069] In this embodiment, in order to facilitate the full adhesion of the sheet element 200 to the inner surface 100a of the hollow tube 100, the cross-section of the hollow tube 100 is circular, that is, the hollow tube 100 is a circular tube. However, the cross-sectional shape of the hollow tube 100 is not limited to a circle, and can also be elliptical, oval, or other shapes.

[0070] It should be noted that in some cases, the air inlet 131 and the air outlet 132 can be interchanged.

[0071] like Figure 9 As shown, this embodiment of the invention also provides an alcohol detector 1000, which includes an infrared spectral gas detection tube 10, a first detection element 20, and a second detection element 30. The infrared spectral gas detection tube 10 can be referenced from... Figures 1-8 The above and related information will not be repeated here.

[0072] For example, a first detection element 20 is disposed at the first end 11 of the hollow tube 100, and a second detection element 30 is disposed at the second end 12 of the hollow tube 100. One of the first detection element 20 and the second detection element 30 is an infrared emitter, and the other is an infrared receiver; for example, the first detection element 20 is an infrared emitter, and the second detection element 30 is an infrared receiver; or, for another example, the second detection element 30 is an infrared emitter, and the first detection element 20 is an infrared receiver. In practical applications, the infrared light emitted by the infrared emitter passes through the target gas in the hollow tube 100 and is received by the infrared receiver. The alcohol concentration of the target gas can be obtained based on the spectrum of the infrared light received by the infrared receiver.

[0073] The infrared spectral gas detection tube and alcohol detector provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An infrared spectroscopic gas detection tube, characterized by, The hollow tube (100), the sheet element (200) and the glue layer (300) are included. The hollow tube (100) is provided with a gas inlet (131) and a gas outlet (132) which are communicated with the internal space (133) of the hollow tube (100), and the gas inlet (131), the internal space (133) and the gas outlet (132) form a gas flow channel for the measured gas. The sheet element (200) includes oppositely arranged reflective surface (200a) and sticking surface (200b), and oppositely arranged first side edge (211), second side edge (212) and oppositely arranged third side edge (213), fourth side edge (214); the sticking surface (200b) of the sheet element (200) is fixed on the inner surface (100a) of the hollow tube (100) by the glue layer (300), the sheet element (200) forms a cylindrical structure (201) with two ends (260) opening (240) in the internal space (133) of the hollow tube (100), and a joint (220) is formed on the side wall (210) of the cylindrical structure (201); the first side edge (211) and the second side edge (212) are respectively located at the two ends (260) of the cylindrical structure (201), the joint (220) is formed between the third side edge (213) and the fourth side edge (214), and the third side edge (213) and the fourth side edge (214) do not overlap.

2. The infrared spectral gas detection tube according to claim 1, wherein The width of the joint (220) is greater than 0.

3. The infrared spectral gas detection tube of claim 1, wherein, The width of the joint (220) is equal to 0.

4. The infrared spectral gas detection tube of claim 1, wherein, The sheet element (200) includes a laminated substrate layer (230) and a reflective material layer (250), one side of the substrate layer (230) away from the reflective material layer (250) forms the sticking surface (200b), and one side of the reflective material layer (250) away from the substrate layer (230) forms the reflective surface (200a).

5. The infrared spectral gas detection tube of claim 4, wherein, The material of the substrate layer (230) is copper or aluminum, and the material of the reflective material layer (250) is gold.

6. The infrared spectral gas detection tube according to any one of claims 1 to 5, characterized in that Each area on the sticking surface (200b) of the sheet element (200) is directly fixed to the inner surface (100a) of the hollow tube (100) by the glue layer (300).

7. The infrared spectral gas detection tube according to any one of claims 1 to 5, wherein The glue layer (300) is a UV glue layer. The wall of the hollow tube (100) is used for ultraviolet light to pass through.

8. The infrared spectral gas detection tube according to any one of claims 1 to 5, wherein A heating element (400) is further included, which is arranged on the outer surface (100b) of the hollow tube (100).

9. An alcohol detector, characterized in that, It includes: The infrared spectrum gas detection tube (10) is the infrared spectrum gas detection tube (10) according to any one of claims 1-8; A first detection element (20) is arranged at the first end of the hollow tube (100) A second detection element (30) is arranged at the second end (12) of the hollow tube (100). One of the first detection element (20) and the second detection element (30) is an infrared emitter, and the other is an infrared receiver.

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