An optical cavity tunable sensor

Abstract

The utility model discloses a kind of optical cavity adjustable distance's sensor, including infrared light source and infrared detector, further including light source adjusting pipe and infrared detection pipe, the infrared light source is connected with light source adjusting pipe one end, the infrared detector is connected with the one end of infrared detection pipe away from infrared light source, the one end of light source adjusting pipe is inserted into infrared detection pipe and is matched with infrared detection pipe Sliding;Air inlet is set on the light source adjusting pipe, the cavity of light source adjusting pipe and infrared detection pipe cavity intercommunication form optical cavity, the infrared detection pipe is provided with air outlet, the air inlet, optical cavity and air outlet intercommunication.The one end of light source adjusting pipe is inserted into infrared detection pipe and is matched with infrared detection pipe Sliding, to facilitate adjusting the distance of optical cavity two ends light source and infrared detector, can adapt to the detection of different gas types and concentration, can satisfy the detection demand of diversification, can flexible adapt to multi-scene detection.

Description

Technical Field

[0001] This utility model relates to the field of detectors, and more specifically to a sensor with an adjustable optical cavity distance. Background Technology

[0002] The optical cavity is an important part of the infrared pyroelectric gas sensor module. The optical path of the optical cavity determines the performance of the sensor. Different concentrations of gas absorb infrared light to different degrees. When the concentration changes, in order to ensure that the infrared detector can accurately detect the change in infrared irradiance, the optical path needs to be adjusted. If the optical path is fixed, the signal may saturate at high concentrations and be too weak to distinguish at low concentrations. Different gas molecules have different chemical bond vibration modes, which makes them exhibit different absorption peaks under infrared irradiation. Each gas has its own specific infrared absorption spectrum. To ensure the accuracy of detection, the optical path also needs to be adjusted. If the optical path is not appropriate, it may lead to a detection signal that is too weak or too strong, making it difficult to distinguish accurately. In practical applications, there are many types of gases that need to be detected, and the concentration range of the gases that need to be detected is also wide. Currently, these diverse detection needs cannot be met. When sensors test the same gas at different concentrations or different gases at the same concentration, they usually need to design and prepare optical cavities with different optical paths according to the gas properties. First, the optical cavities do not have enough compatibility, making it difficult to flexibly adapt to multi-scenario detection and failing to guarantee the accuracy of the detection. Second, the requirements of multiple gases and multiple concentrations also bring inconvenience to production and material management. Therefore, this application designs an "optical cavity adjustable distance sensor" to solve the above problems. Utility Model Content

[0003] To address the aforementioned problems, this utility model designs an optical cavity adjustable distance sensor, including an infrared light source and an infrared detector, as well as a light source adjustment tube and an infrared detection tube. The infrared light source is connected to one end of the light source adjustment tube, and the infrared detector is connected to the end of the infrared detection tube away from the infrared light source. One end of the light source adjustment tube extends into the infrared detection tube and slides in cooperation with the infrared detection tube. An air inlet is provided on the light source adjustment tube, and the cavity of the light source adjustment tube is connected to the cavity of the infrared detection tube to form an optical cavity. An air outlet is provided on the infrared detection tube, and the air inlet, the optical cavity, and the air outlet are connected.

[0004] Compared with the prior art, the beneficial effects of this utility model are as follows: by having one end of the light source adjustment tube extend into the infrared detection tube and slide in cooperation with the infrared detection tube, the light source adjustment tube can move within the infrared detection tube, thereby facilitating the adjustment of the distance between the light source and the infrared detector at both ends of the optical cavity. This allows for the detection of different types of gases and different gas concentrations, meeting diverse detection needs and flexibly adapting to multi-scenario detection, thus ensuring the accuracy of detection. At the same time, it avoids the need to produce sensors of different specifications, which is beneficial for production and material management.

[0005] Furthermore, the light source adjustment tube is provided with a receiving groove on its outside, and a sealing ring is sleeved in the receiving groove. The sealing ring slides with the light source adjustment tube inside the infrared detection tube, and the sealing ring is in interference contact with the light source adjustment tube and the infrared detection tube.

[0006] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by setting a receiving groove outside the light source adjustment tube and setting a sealing ring inside the receiving groove, the sealing ring can make interference contact with the light source adjustment tube and the infrared detection tube, which can seal the cavity inside the optical cavity, block the communication between the optical cavity and the outside, thereby preventing gas leakage during the flow process and ensuring the accuracy of detection.

[0007] Furthermore, the receiving groove includes several annular grooves, and the sealing ring includes a sealing ring body, on which several sealing teeth are provided to cooperate with the annular grooves.

[0008] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by using a accommodating groove as a number of annular grooves and a sealing ring with a number of sealing teeth that cooperate with the annular grooves, the sealing performance of the gas inside the optical cavity is further improved, and the accuracy of detection is further improved.

[0009] Furthermore, the end of the light source adjustment tube furthest from the infrared detection tube is provided with several mounting holes. The infrared light source is locked in place by several locking bolts and mounting holes, and the infrared light source extends into the optical cavity at the end away from the infrared detection tube. The infrared detector tube has several mounting holes 2 at the end away from the light source adjustment tube. The infrared detector is locked in place by several locking bolts 2 with the mounting holes 2. The infrared detector extends into the optical cavity at the end away from the light source adjustment tube.

[0010] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The infrared light source is locked to the mounting hole one on the light source adjustment tube by the locking bolt, so that the infrared light source can be detachably connected to one end of the light source adjustment tube. When the infrared light source is damaged, it is convenient to replace the infrared light source; The infrared detector is locked to the mounting hole two at one end of the infrared detector tube by the locking bolt two, so that the infrared detector can be detachably connected to one end of the infrared detector tube. When the infrared detector is damaged, it is convenient to replace the infrared detector. Furthermore, a first connecting seat is provided at the end of the light source adjustment tube away from the infrared detection tube. The first connecting seat has an inner cavity, which communicates with the cavity of the light source adjustment tube. The first connecting seat has a first connecting hole, a second connecting hole, and several mounting holes. The first connecting hole communicates with the cavity of the light source adjustment tube through the inner cavity; the mounting holes are not communicated with the inner cavity; the second connecting hole communicates with the cavity of the light source adjustment tube through the inner cavity. The air inlet is connected to the first connecting hole, the air outlet is located on the side wall of the end of the infrared detection tube away from the light source adjustment tube, the infrared light source is locked by several locking bolts and mounting holes, and the infrared light source extends into the inner cavity of the first connecting seat through the second connecting hole. Preferably, the light source adjustment tube is cylindrical, and the cavity of the infrared detection tube is a cylindrical cavity.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By setting the first connecting seat, it is convenient to stably connect the air intake device after communicating with the air inlet through the first connecting hole, and it is also convenient to stably install the infrared light source on the first connecting seat through the mounting hole, so that the infrared light source enters the optical cavity of the light source regulating tube through the second connecting hole. The gas enters the optical cavity from the end of the light source regulating tube away from the infrared detection tube and exits from the end of the infrared detection tube away from the light source regulating tube, providing an air intake and exhaust channel that is conducive to detection for the gas flow inside the optical cavity; the cylindrical shape of the light source regulating tube, which matches the cylindrical cavity inside the infrared detection tube, is conducive to the stable connection of the light source regulating tube and the infrared detection tube.

[0012] Furthermore, the infrared detector tube wall is provided with a limiting hole, and a limiting bolt is provided in the limiting hole. The limiting bolt is threadedly engaged with the limiting hole, and the limiting bolt is engaged with the light source adjustment tube for locking.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by setting a limiting hole in the wall of the infrared detection tube, the limiting bolt can move within the limiting hole, thereby locking the light source adjustment tube. This avoids the situation where the light source adjustment tube moves after the optical cavity has moved to the appropriate range, resulting in inaccurate range, thereby improving the accuracy of detection.

[0014] Furthermore, a guide groove is provided on the outer wall of the light source adjustment tube, the guide groove is arranged along the axial direction of the light source adjustment tube, and one end of the limiting bolt is arranged in the limiting hole.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by setting a guide groove on the outer wall of the light source adjustment tube, the end of the bolt slides with the guide groove, avoiding the rotation of the light source adjustment tube when it moves inside the infrared detection tube. When it moves to the appropriate position, the light source adjustment tube is locked, which further improves the accuracy of the range.

[0016] Furthermore, the outer wall of the light source adjustment tube is provided with a scale, and a light source filter is also provided inside the light source adjustment tube.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that by setting a scale on the outer wall of the light source adjustment tube, the distance of the optical cavity can be easily adjusted.

[0018] Furthermore, the outer wall of the light source adjustment tube is provided with external threads, the inner wall of the cavity of the infrared detection tube is provided with internal threads, and the light source adjustment tube is threadedly connected to the infrared detection tube.

[0019] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by providing an external thread on the outer wall of the light source adjustment tube and an internal thread that mates with the external thread on the inner wall of the cavity of the infrared detection tube, the light source adjustment tube and the infrared detection tube are threadedly connected, which enables the light source adjustment tube to move stably within the infrared detection tube, avoiding the situation where the measurement range is inaccurate due to the movement of the light source adjustment tube, thereby improving the accuracy of detection.

[0020] Furthermore, the telescopic mechanism includes a motor, and the telescopic mechanism includes a movable end structure and a fixed end structure; The movable end structure includes a second connecting seat connected to the end of the light source adjustment tube away from the infrared detection tube. The second connecting seat has 2n threaded holes arranged in pairs opposite each other, where n≥1. The axis of the threaded holes is parallel to the axis of the optical cavity. The fixed end structure includes 2n motors circumferentially arranged on the outer wall of the infrared detection tube, where n≥1; the output shaft of each motor is connected to a screw, one end of which extends into a threaded hole, and the axial direction of the screw is parallel to the axial direction of the optical cavity. The portion of the light source adjustment tube located outside the infrared detection tube is situated between several screws.

[0021] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the motor of the telescopic mechanism drives the screw to rotate, and the screw engages with the thread in the fixed seat, so that the second connecting seat moves on the screw, thereby driving the light source adjustment tube to slide inside the infrared detection tube. By setting 2n threaded holes arranged in pairs opposite each other, with the axis of the threaded holes parallel to the axis of the optical cavity, and setting 2n motors in the circumferential direction of the infrared detection tube, the stable sliding of the light source adjustment tube can be guaranteed. It can be used for multiple measurements of different concentrations in the same production environment, avoiding the situation where manual personnel repeatedly enter the production environment to adjust. When a certain concentration is required in the production environment, the controller controls the motor to drive the ball screw to rotate. The ball screw drives the nut to move, which in turn drives the light source adjustment tube to move, thereby adjusting the range of the optical cavity. This improves production safety, flexibly adapts to multiple detection scenarios, and brings great convenience to production and material management. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the adjustable optical cavity sensor in Embodiment 1; Figure 2 This is a cross-sectional view of the optical cavity adjustable distance sensor of Embodiment 1; Figure 3 This is a schematic diagram of the structure of the light source adjustment tube in Embodiment 1. Figure 1 ; Figure 4 This is a schematic diagram of the infrared detector tube in Example 1; Figure 5 This is a schematic diagram of the structure of the light source adjustment tube in Example 2; Figure 6 This is a schematic diagram of the sealing ring structure in Example 2; Figure 7 This is a schematic diagram of the structure of the adjustable optical cavity sensor in Embodiment 3; Figure 8 This is a cross-sectional view of the optical cavity adjustable distance sensor of Embodiment 3; Figure 9 This is a schematic diagram of the structure of the light source adjustment tube in Example 3; Figure 10 This is a schematic diagram of the structure of the light source adjustment tube in Example 4; Figure 11 This is a cross-sectional view of the infrared detector tube in Example 4; Figure 12 This is a schematic diagram of the structure of the optical cavity adjustable distance sensor in Example 5; The components include: 1. Light source adjustment tube; 11. Air inlet; 12. Receiving groove; 121. Annular groove; 13. Sealing ring; 131. Sealing body; 132. Sealing teeth; 14. Guide groove; 15. Scale; 16. External thread; 17. First connecting seat; 171. First connecting hole; 172. Second connecting hole; 18. Mounting hole one; 2. Infrared detection tube; 21. Air outlet; 22. Limiting hole; 23. Limiting bolt; 24. Internal thread; 25. Mounting hole two; 3. Optical cavity; 4. Telescopic mechanism; 41. Motor; 42. Screw; 43. Second connecting seat; 5. Infrared light source; 6. Light source filter; 7. Infrared detector. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model.

[0024] This embodiment provides Embodiment 1: as follows Figure 1-6 As shown: This embodiment provides a sensor with an adjustable optical cavity 3, including an infrared light source 5 and an infrared detector 7, as well as a light source adjustment tube 1 and an infrared detector tube 2. The infrared light source 5 is connected to one end of the light source adjustment tube 1, and the infrared detector 7 is connected to the end of the infrared detector tube 2 away from the infrared light source 5. One end of the light source adjustment tube 1 extends into the infrared detector tube 2 and slides in cooperation with the infrared detector tube 2. An air inlet 11 is provided on the light source adjustment tube 1, and the cavity of the light source adjustment tube 1 and the cavity of the infrared detector tube 2 are connected to form an optical cavity 3. An air outlet 21 is provided on the infrared detector tube 2, and the air inlet 11, the optical cavity 3 and the air outlet 21 are connected. By having one end of the light source adjustment tube 1 extend into the infrared detection tube 2 and slide in cooperation with it, the light source adjustment tube 1 can move within the infrared detection tube 2, thereby facilitating the adjustment of the distance between the light source at both ends of the optical cavity 3 and the infrared detector 7. This allows for the detection of different types and concentrations of gases, meeting diverse detection needs and flexibly adapting to multiple detection scenarios, thus ensuring detection accuracy. It also avoids the need to produce sensors of different specifications, which is beneficial for production and material management.

[0025] The light source adjustment tube 1 has an external receiving groove 12, and a sealing ring 13 is fitted inside the receiving groove 12. The sealing ring 13 slides within the infrared detection tube 2 along with the light source adjustment tube 1, and the sealing ring 13 is in interference contact with the light source adjustment tube 1 and the infrared detection tube 2. By providing a receiving groove 12 on the outside of the light source adjustment tube 1 and a sealing ring 13 inside the receiving groove 12, the sealing ring 13 is in interference contact with the light source adjustment tube 1 and the infrared detection tube 2, thus sealing the cavity inside the optical cavity 3, preventing communication between the optical cavity 3 and the outside, thereby preventing gas leakage during the flow process and ensuring the accuracy of the detection.

[0026] The light source regulating tube 1 has several mounting holes 18 at its end away from the infrared detection tube 2. The infrared light source 5 is locked in place by several locking bolts through the mounting holes 18, and the infrared light source 5 extends into the optical cavity 3 at its end away from the infrared detection tube 2. The infrared detection tube 2 has several mounting holes 25 at its end away from the light source regulating tube 1, and the infrared detector 7 is locked in place by several locking bolts through the mounting holes 25, and the infrared detector 7 extends into the optical cavity 3 at its end away from the light source regulating tube 1. The infrared light source 5 is locked in place by the locking bolts through the mounting holes 18 on the light source regulating tube 1, allowing the infrared light source 5 to be detachably connected to one end of the light source regulating tube 1, thus facilitating replacement when the infrared light source 5 is damaged. The infrared detector 7 is locked in place by the locking bolts through the mounting holes 25 at one end of the infrared detection tube 2, thus allowing the infrared detector 7 to be detachably connected to one end of the infrared detection tube 2, thus facilitating replacement when the infrared detector 7 is damaged. The infrared detector tube 2 has a limiting hole 22 on its wall, and a limiting bolt 23 is installed in the limiting hole 22. The limiting bolt 23 is threaded into the limiting hole 22 and locks in place with the light source adjustment tube 1. By providing a limiting hole 22 on the infrared detector tube 2, the limiting bolt 23 can move within the limiting hole 22, thereby locking the light source adjustment tube 1. This prevents the light source adjustment tube 1 from moving after the optical cavity 3 has been moved to the appropriate range, thus avoiding inaccurate range measurement due to range movement and improving the accuracy of detection.

[0027] The outer wall of the light source adjustment tube 1 is provided with a guide groove 14, which is arranged along the axial direction of the light source adjustment tube 1. One end of the limiting bolt 23 is located in the limiting hole 22. By providing the guide groove 14 on the light source adjustment tube 1, the end of the bolt slides with the guide groove 14, preventing the light source adjustment tube 1 from rotating when moving inside the infrared detection tube 2. When it moves to the appropriate position, the light source adjustment tube 1 is locked, further improving the accuracy of the measurement range.

[0028] The outer wall of the light source adjustment tube 1 is provided with a scale 15, and a light source filter 6 is also provided inside the light source adjustment tube 1. By providing a scale 15 on the outer wall of the light source adjustment tube 1, the distance of the optical cavity 3 can be easily adjusted.

[0029] Example 2: Figure 5-6 As shown: The content that is the same as in Example 1 will not be repeated here; the differences between this embodiment and Example 1 are as follows: The receiving groove 12 includes several annular grooves 121, and the sealing ring 13 includes a sealing ring body 131. The sealing ring body 131 is provided with several sealing teeth 132 that mate with the annular grooves 121. By having the receiving groove 12 comprise several annular grooves 121 and the sealing ring 13 provided with several sealing teeth 132 that mate with the annular grooves 121, the sealing performance of the gas inside the optical cavity 3 is further improved, thereby further improving the accuracy of detection.

[0030] Example 3: Figure 7-9 As shown: The content that is the same as in Example 2 will not be repeated here; the differences between this embodiment and Example 2 are as follows: A first connecting seat 17 is provided at the end of the light source adjustment tube 1 away from the infrared detection tube 2. The first connecting seat 17 has an inner cavity that communicates with the cavity of the light source adjustment tube 1. The first connecting seat 17 has a first connecting hole 171, a second connecting hole 172, and several mounting holes 18. The first connecting hole 171 communicates with the cavity of the light source adjustment tube 1 through the inner cavity; the mounting holes 18 do not communicate with the inner cavity; the second connecting hole 172 communicates with the cavity of the light source adjustment tube 1 through the inner cavity; the air inlet 11 communicates with the first connecting hole 171; the air outlet 21 is located on the side wall of the end of the infrared detection tube 2 away from the light source adjustment tube 1; the infrared light source 5 is locked in place by several locking bolts in cooperation with the mounting holes 18; the infrared light source 5 extends into the inner cavity of the first connecting seat 17 through the second connecting hole 172; preferably, the light source adjustment tube 1 is cylindrical, and the cavity of the infrared detection tube 2 is a cylindrical cavity. By setting the first connecting seat 17, it is convenient to stably connect the air intake device after communicating with the air inlet 11 through the first connecting hole 171. It is also convenient to stably install the infrared light source 5 on the first connecting seat 17 through the mounting hole 18. Thus, the infrared light source 5 enters the optical cavity 3 of the light source regulating tube 1 through the second connecting hole 172. The gas enters the optical cavity 3 from the end of the light source regulating tube 1 away from the infrared detection tube 2 and exits from the end of the infrared detection tube 2 away from the light source regulating tube 1, providing an air intake and exhaust channel that is conducive to detection for the gas flow inside the optical cavity 3. Since the light source regulating tube 1 is cylindrical and cooperates with the cylindrical cavity inside the infrared detection tube 2, it is beneficial to the stable connection between the light source regulating tube 1 and the infrared detection tube 2.

[0031] Example 4: Figure 10-11 As shown The contents that are the same as in Example 3 will not be repeated here; the different aspects of this embodiment compared to Example 3 are as follows: The outer wall of the light source adjustment tube 1 is provided with an external thread 16, and the inner wall of the cavity of the infrared detection tube 2 is provided with an internal thread 24. The light source adjustment tube 1 and the infrared detection tube 2 are threadedly connected. The external thread 16 on the outer wall of the light source adjustment tube 1 and the internal thread 24 on the inner wall of the cavity of the infrared detection tube 2, which mates with the external thread 16, ensure a stable movement of the light source adjustment tube 1 within the infrared detection tube 2. This prevents inaccurate measurement range due to movement of the light source adjustment tube 1, thereby improving the accuracy of the detection.

[0032] Example 5: Figure 12 As shown: The content that is the same as in Example 4 will not be repeated here; the differences between this embodiment and Example 4 are as follows: The telescopic mechanism 4 includes a motor 41 and a movable end structure and a fixed end structure. The movable end structure includes a second connecting seat 43 connected to the end of the light source adjustment tube 1 away from the infrared detection tube 2. The second connecting seat 43 has 2n threaded holes arranged in pairs opposite each other, where n ≥ 1. The axial direction of the threaded holes is parallel to the axial direction of the optical cavity 3. The fixed end structure includes 2n motors 41 arranged circumferentially on the outer wall of the infrared detection tube 2, where n ≥ 1. The output shaft of each motor 41 is driven by a screw 42. One end of the screw 42 extends into the threaded hole, and the axial direction of the screw 42 is parallel to the axial direction of the optical cavity 3. The portion of the light source adjustment tube 1 located outside the infrared detection tube 2 is located between several screws 42. The motor 41 of the telescopic mechanism 4 drives the screw 42 to rotate. The screw 42 engages with the thread in the fixed seat, causing the second connecting seat 43 to move on the screw 42. This causes the light source adjustment tube 1 to slide inside the infrared detection tube 2. By setting 2n threaded holes arranged in pairs, with the axis of the threaded holes parallel to the axis of the optical cavity 3, and setting 2n motors 41 around the infrared detection tube 2, the stable sliding of the light source adjustment tube 1 can be ensured. This is suitable for multiple measurements of different concentrations in the same production environment, avoiding the need for manual repeated entry into the production environment for adjustment. When a certain concentration is required in the production environment, the controller controls the motor 41 to drive the ball screw to rotate. The ball screw drives the nut to move, thereby moving the light source adjustment tube 1 and adjusting the range of the optical cavity 3. This improves production safety, flexibly adapts to multi-scenario detection, and brings great convenience to production and material management.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An optical cavity adjustable distance sensor, comprising an infrared light source (5) and an infrared detector (7), characterized in that: It also includes a light source adjustment tube (1) and an infrared detection tube (2). The infrared light source (5) is connected to one end of the light source adjustment tube (1), and the infrared detector (7) is connected to the end of the infrared detection tube (2) away from the infrared light source (5). One end of the light source adjustment tube (1) extends into the infrared detection tube (2) and slides in cooperation with the infrared detection tube (2). The light source regulating tube (1) is provided with an air inlet (11). The cavity of the light source regulating tube (1) is connected to the cavity of the infrared detection tube (2) to form an optical cavity (3). The infrared detection tube (2) is provided with an air outlet (21). The air inlet (11), the optical cavity (3) and the air outlet (21) are connected.

2. The optical cavity adjustable distance sensor according to claim 1, characterized in that: The light source adjustment tube (1) is provided with a receiving groove (12) on the outside. A sealing ring (13) is sleeved inside the receiving groove (12). The sealing ring (13) slides inside the infrared detection tube (2) along with the light source adjustment tube (1). The sealing ring (13) is in interference contact with the light source adjustment tube (1) and the infrared detection tube (2).

3. The optical cavity adjustable distance sensor according to claim 2, characterized in that: The receiving groove (12) includes a plurality of annular grooves (121), and the sealing ring (13) includes a sealing ring body (131). The inner wall of the sealing ring body (131) is provided with a plurality of sealing teeth (132) that cooperate with the annular grooves (121).

4. The optical cavity adjustable distance sensor according to claim 1, characterized in that: The end of the light source adjustment tube (1) away from the infrared detection tube (2) is provided with several mounting holes (18). The infrared light source (5) is locked in place by a number of locking bolts and mounting holes (18), and the infrared light source (5) extends into the optical cavity (3); The infrared detector tube (2) has several mounting holes (25) at one end away from the light source adjustment tube (1). The infrared detector (7) is locked in place by several locking bolts and the mounting holes (25). The infrared detector (7) extends into the optical cavity (3).

5. The optical cavity adjustable distance sensor according to claim 1, characterized in that: The light source adjustment tube (1) is provided with a first connecting seat (17) at the end away from the infrared detection tube (2). The first connecting seat (17) has an inner cavity, which is connected to the cavity of the light source adjustment tube (1). The first connecting seat (17) has a first connecting hole (171), a second connecting hole (172) and several mounting holes (18). The first connecting hole (171) is connected to the cavity of the light source adjustment tube (1) through the inner cavity. The mounting holes (18) are not connected to the inner cavity. The second connecting hole (172) is connected to the cavity of the light source adjustment tube (1) through the inner cavity. The air inlet (11) is connected to the first connecting hole (171), the air outlet (21) is located on the side wall of the infrared detection tube (2) away from the light source adjustment tube (1), the infrared light source (5) is locked with the mounting hole (18) by several locking bolts, and the infrared light source (5) extends into the inner cavity of the first connecting seat (17) through the second connecting hole (172).

6. The optical cavity adjustable distance sensor according to claim 1, characterized in that: The infrared detector tube (2) has a limiting hole (22) on its tube wall. A limiting bolt (23) is provided in the limiting hole (22). The limiting bolt (23) is threadedly connected to the limiting hole (22). The limiting bolt (23) is locked in conjunction with the light source adjustment tube (1).

7. The optical cavity adjustable distance sensor according to claim 6, characterized in that: The outer wall of the light source adjustment tube (1) is provided with a guide groove (14), the guide groove (14) is arranged along the axial direction of the light source adjustment tube (1), and one end of the limiting bolt (23) is arranged in the guide groove (14).

8. The optical cavity adjustable distance sensor according to claim 1, characterized in that: The outer wall of the light source adjustment tube (1) is provided with a scale (15), and a light source filter (6) is also provided inside the light source adjustment tube (1).

9. The optical cavity adjustable distance sensor according to claim 1, characterized in that: The outer wall of the light source adjustment tube (1) is provided with an external thread (16), and the inner wall of the infrared detection tube (2) is provided with an internal thread (24). The light source adjustment tube (1) and the infrared detection tube (2) are threadedly connected.

10. The optical cavity adjustable distance sensor according to claim 8, characterized in that: It also includes a telescopic mechanism (4), which includes a movable end structure and a fixed end structure; The movable end structure includes a second connecting seat (43) connected to the end of the light source adjustment tube (1) away from the infrared detection tube (2). The second connecting seat (43) is provided with 2n threaded holes arranged in pairs opposite each other, where n≥1; the axis of the threaded holes is parallel to the axis of the optical cavity (3). The fixed end structure includes 2n motors (41) arranged circumferentially on the outer wall of the infrared detection tube (2), where n≥1; the output shaft of the motor (41) is connected to a screw (42), one end of the screw (42) extends into a threaded hole, and the axial direction of the screw (42) is parallel to the axial direction of the optical cavity (3); The portion of the light source adjustment tube (1) located outside the infrared detection tube (2) is situated between several screws (42).

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