A fiber optic temperature and humidity sensor

Abstract

The present application relates to the technical field of optical fiber sensors, and in particular to an optical fiber temperature and humidity sensor. The optical fiber temperature and humidity sensor has a plurality of hollowed-out parts spaced apart on its housing, and a three-pronged fixing rod is fixedly connected to the inner wall of the housing. The three-pronged fixing rod divides the interior of the housing into three independent cavities. The three-pronged fixing rod is provided with a through hole to connect adjacent cavities. A fiber core is provided in each cavity, and the fiber core is fixed to the three-pronged fixing rod by a fixing member. Each fiber core is spaced apart and has a plurality of temperature and humidity sensing element areas corresponding to the hollowed-out parts on the housing. The three-pronged fixing rod on the inner wall of the housing not only significantly enhances the deformation resistance of the housing, but also divides the interior of the housing into three independent cavities. The corresponding temperature and humidity sensing element areas in the three cavities perform synchronous detection of the temperature and humidity at the same depth inside the detected object, significantly improving the accuracy and reliability of the measurement.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber sensors, and in particular to an optical fiber temperature and humidity sensor. Background Art

[0002] Temperature and humidity control are crucial to the storage environment in many industries, especially in the fields of agriculture and food processing, such as tobacco and grain storage, where quality maintenance is directly related to the quality and market value of the final product. During the storage of agricultural products or foods, precise management of temperature and humidity plays a decisive role in preventing mold and maintaining taste and nutritional value. Currently, warehouse environment monitoring mainly relies on traditional pointer thermometers and hygrometers or electronic temperature and humidity sensors, but these tools are limited to monitoring the warehouse air environment and cannot effectively penetrate the densely stacked material piles to achieve accurate monitoring of core areas. This monitoring blind spot leads to insufficient overall understanding of storage conditions and makes it difficult to ensure that all storage areas are in optimal conditions. Therefore, the development of a technology that can monitor temperature and humidity deep inside the material pile is of great significance to improving storage management and ensuring product quality.

[0003] The invention patent with application number 201911241027.9 provides a new type of optical fiber temperature and humidity sensor, which fixes a single-mode optical fiber bundle in a fiber bundle fixing groove and then places it in a fiber bundle packaging shell. The front end connector of the sensor is connected to the internal thread of the fiber bundle packaging shell; the other end of the fiber bundle packaging shell is connected to the front end external thread of the tail of the fixing groove, and the front end of the sensor pigtail structure is connected to the internal thread of the tail end of the fiber bundle fixing groove. Finally, the outer surface of the pigtail structure is sealed by a rubber structure and inserted into the tobacco pile through the conical connector at the front end of the sensor to achieve quasi-distributed measurement of the internal ambient temperature and humidity of the tobacco pile.

[0004] However, in actual use, although the hollow design on the fiber optic bundle packaging shell is conducive to environmental interaction, it also inevitably weakens the structural strength of the shell. In the process of inserting the sensor deep into the object to be measured, the shell is very easy to deform when squeezed, which in turn causes the shape of the fiber optic bundle. The arrangement and state of the internal fiber optic bundle change directly affect the accuracy of the measurement data. In addition, the temperature and humidity at the same depth only rely on one set of temperature and humidity sensors for measurement. Once this set of sensors fails or malfunctions, it will directly lead to reading deviations, thereby greatly reducing the reliability and trustworthiness of the measurement results, affecting the staff's judgment on the internal temperature and humidity of the object being tested.

[0005] In order to solve the above problems, the present invention proposes an optical fiber temperature and humidity sensor. Summary of the Invention

[0006] In order to solve the problems existing in the background technology, the present invention proposes an optical fiber temperature and humidity sensor.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The optical fiber temperature and humidity sensor includes a housing with a plurality of hollow portions spaced apart therefrom. A conical front end is provided at one end of the housing, and a pigtail structure is mounted on the other end of the housing. A three-pronged fixing rod is fixedly connected to the inner wall of the housing. The three-pronged fixing rod divides the interior of the housing into three independent cavities. The three-pronged fixing rod is provided with a through hole to connect adjacent cavities. A fiber core is provided in each cavity, and the fiber core is fixed to the three-pronged fixing rod by a fixing member.

[0009] The ends of the fiber cores pass through the pigtail structure to realize signal output. A plurality of temperature and humidity sensing element areas corresponding to the hollow parts on the shell are arranged at intervals on each fiber core.

[0010] By fixing a three-pronged fixing rod on the inner wall of the shell and dividing the interior of the shell into three independent cavities, the structural strength of the entire sensor is significantly enhanced, and the sensor deformation caused by external stress changes is reduced, thereby ensuring the stability of the internal fiber core and temperature and humidity sensing element area, and improving measurement accuracy.

[0011] The through-hole design on the three-pronged fixing rod allows adjacent cavities to communicate with each other, achieving a balance of temperature and humidity information. At the same time, each fiber core is spaced apart with temperature and humidity sensing elements corresponding to the hollowed-out portions of the outer shell. Because the detection environment within the three cavities remains the same, the corresponding temperature and humidity sensing elements in the three cavities simultaneously detect the temperature and humidity at the same depth within the object being detected, significantly improving the accuracy and reliability of the measurement. Even if a sensor element fails, the sensors in the other cavities will continue to operate and provide accurate measurement data, ensuring that the sensor can continue to provide reliable information at critical moments.

[0012] Furthermore, the through holes provided on the three-pronged fixing rod are spaced apart along the length direction thereof; or, the through holes are long holes extending along the length direction of the three-pronged fixing rod.

[0013] Through-holes are spaced or arranged along the length of the three-pronged fixed rod, accelerating the transfer of temperature and humidity information between adjacent cavities. When the external temperature and humidity change, this design quickly transmits this information to each cavity through the through-holes, allowing the sensor to reach a new equilibrium more quickly, thereby improving measurement response speed and accuracy.

[0014] Long holes or spaced through holes also reduce the material usage of the three-prong fixing rod, reducing the overall weight, while still maintaining sufficient structural support to prevent the sensor from deforming in complex environments. This design maintains the stability of the sensor while also improving its adaptability and durability.

[0015] Furthermore, a stress sensor for detecting the stress on the front end head and the housing is fixed inside the housing, and a connecting line on the stress sensor passes through the central through-hole of the three-pronged fixing rod and the pigtail structure to output a signal.

[0016] When it is difficult for the optical fiber temperature and humidity sensor to penetrate the interior of the object to be detected, the operator can rotate the optical fiber temperature and humidity sensor to effectively reduce friction to facilitate further penetration. During the process of rotating the sensor into the object to be detected, the front end and the outer shell will be subjected to resistance stress and torque stress. The stress sensor can accurately detect the above stress data, so that after the optical fiber temperature and humidity sensor is inserted, the collected stress data can be analyzed to determine the specific impact of stress on the measurement results of the temperature and humidity sensor. The error part caused by stress can be subtracted from the original measurement data to eliminate the impact of the above stress on the detection results, thereby ensuring the accuracy and reliability of the measurement results.

[0017] Furthermore, a swivel is provided on the front end head, an arc-shaped limit rotation groove is provided at the end of the shell adjacent to the front end head, a limit block is provided on the swivel that slides with the limit rotation groove, and a torsion spring is also provided between the shell and the swivel. When the torsion spring is in an unstressed state, the initial position of the limit block is located at one end of the limit rotation groove.

[0018] A torsion spring is provided to limit the initial position of the limit block. During the operation of rotating the fiber optic temperature and humidity sensor in the set direction to penetrate the object being detected, the initial idle rotation of the housing is cleverly achieved through the sliding cooperation between the limit rotation groove and the limit block. This idle rotation of the housing disperses the torque stress applied to the fiber optic temperature and humidity sensor during rotation. Furthermore, after the operation is completed, the torsion spring drives the rotating ring to reverse and reset, releasing the torque stress applied to the fiber optic temperature and humidity sensor.

[0019] The optical fiber temperature and humidity sensor can adaptively adjust and release the torque stress on the sensor during operation, thereby reducing the influence of the torque stress on the measurement results and significantly improving the measurement accuracy. Even if the friction of the object being tested causes the front end head and the swivel to be unable to be completely reset, the stress sensor can still collect the stress data that has not been completely eliminated for correction processing, thereby eliminating the influence of stress on the test results.

[0020] Furthermore, a slider is provided at the end of the shell, and a rotation cavity for the slider to rotate is provided in the front end head.

[0021] The combination of the slider and the rotating cavity strengthens the connection between the housing and the front end, making the entire fiber optic temperature and humidity sensor more stable when inserted into the object being detected and less likely to deform or damage. This design improves the durability and reliability of the sensor.

[0022] Furthermore, the height of the rotating cavity wall is greater than the thickness of the slider, so that a clearance fit is formed between the shell and the front end head. A protrusion is also provided in the rotating cavity. When the slider rotates to the bottom of the protrusion, the fit between the shell and the front end head changes from a clearance fit to a transition fit. The slider rotates from the initial position to the angle required with the bottom of the protrusion and is consistent with the central angle of the limiting rotation groove. A slide groove extending along the length direction of the front end head is also provided on the front end head, and a slide rod that cooperates with the slide groove is provided on the rotating ring.

[0023] When the slider reaches the bottom of the bump, the limit block rotates from one end of the limit rotation groove to the other, and the housing and the front end head change from a clearance fit to a transition fit. When the torsion spring drives the swivel to reverse and reset, the slider also reverses, causing the housing and the front end head to return to a clearance fit, thereby relieving the resistance stress along the length of the optical fiber temperature and humidity sensor.

[0024] In the process of adaptively adjusting and releasing torque stress, the optical fiber temperature and humidity sensor simultaneously adjusts and releases resistance stress, which overall reduces the influence of external stress on the measurement results of the optical fiber temperature and humidity sensor and significantly improves the measurement accuracy.

[0025] Furthermore, the limiting rotation groove on the shell, the slider and the sliding groove provided on the front end head are all symmetrically provided with two, and one end of the protrusion is provided with an inclined surface or the top surface of the protrusion is inclined.

[0026] The limited rotation groove, slider and slide groove on the housing and the front end are symmetrically designed, and the corresponding structures are also symmetrically arranged, so that the optical fiber temperature and humidity sensor maintains balance during movement and reduces vibration or deformation caused by uneven force.

[0027] Furthermore, an arc-shaped first limiting groove is provided on the front end head, and an annular second limiting groove is provided on the end of the shell adjacent to the front end head. The swivel is slidably matched with the first limiting groove and the second limiting groove respectively through the first limiting slider and the second limiting slider arranged on the side. A torsion spring is also provided between the shell and the swivel. An installation cavity is also provided inside the second limiting groove, and a gear rod extending along the length direction of the optical fiber temperature and humidity sensor is also provided in the installation cavity. The end of the installation cavity is fixedly connected to a driving device to drive the gear rod to move along its axial direction.

[0028] The initial position of the second limit slider is limited by setting a torsion spring, and in the process of operating the optical fiber temperature and humidity sensor to rotate in any direction to penetrate the object to be detected, the initial idling of the shell is achieved by cleverly staggering the second limit slider and the gear lever. The idling of the shell disperses the torque stress exerted on the optical fiber temperature and humidity sensor during rotation.

[0029] Moreover, after the rotation is completed, considering that the front end head is inside the object to be measured and the friction force received by the front end head is relatively large, an arc-shaped first limiting groove is set on the front end head, so that the swivel is connected to the front end head rotation when the swivel is reset and will not be hindered by the front end head. Moreover, because the second limiting groove is annular, the torsion spring can freely drive the swivel to reverse after the gear lever is retracted to achieve complete reset. The torsion spring can drive the swivel to reverse and achieve complete reset, thereby basically eliminating the torque stress on the optical fiber temperature and humidity sensor, and realizing the adaptive adjustment and complete release of torque stress during the operation of the optical fiber temperature and humidity sensor, thereby basically eliminating the influence of torque stress on the measurement results and significantly improving the measurement accuracy.

[0030] Furthermore, two first limit sliders and two second limit sliders are symmetrically provided on both sides of the swivel, and the positions of the first limit sliders and the second limit sliders correspond to each other. There are two mounting cavities and they are symmetrically arranged in the second limit sliding groove.

[0031] The symmetrical design of the first limit slider and the second limit slider can ensure that the swivel remains balanced when rotating, reducing vibration or deformation caused by uneven force. The corresponding positions of the first limit slider and the second limit slider make it easy to ensure that the two sliders are correctly matched with their respective slide grooves.

[0032] Furthermore, the driving device includes an electromagnet fixedly arranged at the bottom of the installation cavity and a slip ring slidably connected in the installation cavity, the electromagnet is connected to the slip ring through a spring, and the shift rod is fixedly connected to the slip ring.

[0033] The electromagnet is combined with a slip ring and a spring, so the structure is simple, the cost is low, and it is easy to install and maintain.

[0034] The beneficial technical effects of the present invention are:

[0035] The fiber optic temperature and humidity sensor adopts a three-pronged fixed rod to separate the internal cavity, sets a through-hole to balance the temperature and humidity information, integrates a stress sensor to eliminate the influence of stress, and uses a torsion spring, a swivel, a slider and other structures to adaptively adjust and release stress. The structural design significantly enhances the structural strength of the fiber optic temperature and humidity sensor, improves the measurement accuracy and response speed, and maintains the balance of the fiber optic temperature and humidity sensor during movement, reduces vibration and deformation, and the overall design is easy to install and maintain, thereby providing stable and reliable temperature and humidity measurement performance in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the external structure of the first embodiment of the present invention;

[0037] Figure 2 is a cross-sectional view of the housing of the first embodiment of the present invention;

[0038] Figure 3 Schematic diagram of a three-pronged fixing rod according to the first embodiment of the present invention;

[0039] Figure 4 is a cross-sectional view of embodiment 1 of the present invention;

[0040] Figure 5 is a cross-sectional view of a second embodiment of the present invention;

[0041] Figure 6 is a cross-sectional view of a third embodiment of the present invention;

[0042] Figure 7 This is an enlarged view of the insertion end of the third embodiment of the present invention;

[0043] Figure 8 Schematic diagram of the cooperation between the slider and the protrusion in the third embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the decomposition of the third embodiment of the present invention. Figure 1 ;

[0045] Figure 10 This is a schematic diagram of the decomposition of the third embodiment of the present invention. Figure 2 ;

[0046] Figure 11 The insertion end amplifier of the fourth embodiment of the present invention Figure 1 ;

[0047] Figure 12 The insertion end amplifier of the fourth embodiment of the present invention Figure 2 ;

[0048] Figure 13 This is a schematic diagram of the cooperation between the housing and the rotating ring of the fourth embodiment of the present invention;

[0049] Figure 14 This is a schematic diagram of the decomposition of the fourth embodiment of the present invention Figure 1 ;

[0050] Figure 15 This is a schematic diagram of the decomposition of the fourth embodiment of the present invention Figure 2 ;

[0051] In the figure: 1. Shell; 2. Hollow part; 3. Three-pronged fixing rod; 4. Through hole; 5. Fiber core; 6. Temperature and humidity sensor element area; 7. Fixing part; 8. Front end head; 9. Pigtail structure; 10. Stress sensor; 11. Connecting line; 12. Slider; 13. Rotating cavity; 14. Bump; 15. Inclined surface; 16. Slide groove; 17. Rotating ring; 18. Slide rod; 19. Limit block; 20. Limit rotating groove; 21. Torsion spring; 22. First limit slider; 23. First limit slide groove; 24. Second limit slider; 25. Second limit slide groove; 26. Mounting cavity; 27. Slip ring; 28. Gear lever; 29. Electromagnet; 30. Spring. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] Example 1: Figure 1 As shown, a fiber optic temperature and humidity sensor includes a cylindrical housing 1 having a plurality of annular hollow portions 2 spaced circumferentially therefrom. A tapered front end 8 is provided at one end of the housing 1, which is threadably connected to the inner surface of the housing 1. This tapered front end 8 can, to a certain extent, reduce the resistance encountered by the sensor when inserted into the interior of the object being detected. A pigtail 9 is mounted at the other end of the housing 1, which is also threadably connected to the inner surface of the housing 1. The pigtail 9 has a perforation, and a fiber core 5 is disposed within the housing 1. The end of the fiber core 5 passes through the perforation of the pigtail 9 to achieve signal output.

[0054] like Figure 2-Figure 4 As shown, a three-pronged fixing rod 3 is fixedly connected to the inner wall of the housing 1. The three-pronged fixing rod 3 consists of a regular triangular prism in the middle and three forks extending outward from the side edges. The tail ends of each fork of the three-pronged fixing rod 3 are fixedly connected to the inner wall of the housing 1, thereby dividing the interior of the housing 1 into three independent cavities. The three-pronged fixing rod 3 enhances the structural strength of the entire sensor, reduces sensor deformation caused by external stress changes, and thus ensures the stability of the internal fiber core 5.

[0055] In addition, each fork of the three-pronged fixing rod 3 is provided with a plurality of through holes 4 evenly spaced along the length direction of the three-pronged fixing rod 3, so that adjacent cavities can be connected to each other, realizing the sharing and balance of temperature and humidity information. The staff can make appropriate adjustments to the number, aperture and spacing of the through holes 4 according to actual needs.

[0056] Each of the three cavities houses a fiber core 5, secured to a three-pronged fixing rod 3 via multiple fixing elements 7. Attached to the fiber core 5 are multiple temperature and humidity sensing elements 6, located corresponding to the multiple hollow sections 2. The number, length, and density of the hollow sections 2 in the housing can also be adjusted based on actual needs. The temperature and humidity sensing elements 6 comprise a humidity grating and a temperature grating, the surface of which is coated with a humidity-sensitive material.

[0057] During use, the optical fiber temperature and humidity sensor is held vertically with the front end 8 at the bottom. The tapered front end 8 reduces the resistance encountered when inserting the optical fiber temperature and humidity sensor into the object being tested. A three-pronged fixing rod 3 is also fixed within the housing 1. During insertion of the optical fiber temperature and humidity sensor into the object being tested, the pressure borne by the housing 1 toward the outside can be transmitted to the three-pronged fixing rod 3. The provision of the three-pronged fixing rod 3 significantly enhances the structural strength of the housing 1, significantly prolonging the service life of the optical fiber temperature and humidity sensor, and effectively preventing the housing 1 from being compressed and deformed, thereby squeezing the temperature and humidity sensing element area 6 and causing damage to the optical fiber temperature and humidity sensor.

[0058] Furthermore, the three-pronged fixing rod 3 divides the interior of the housing 1 into three chambers. Each of these chambers houses a fiber core 5, on which multiple temperature and humidity sensing elements 6 are mounted. The temperature and humidity conditions within the object being tested are transmitted into the housing 1 through the hollow portion 2 of the housing 1. Each temperature and humidity sensing element 6 corresponds to a corresponding hollow portion 2. Simultaneously, the multiple through-holes 4 in the three-pronged fixing rod 3 connect the three chambers, maintaining a consistent testing environment within the three chambers. This allows the corresponding temperature and humidity sensing elements 6 in each of the three chambers to synchronously measure the temperature and humidity at the same depth within the object being tested, significantly improving measurement accuracy and reliability. Because the temperature and humidity sensing elements 6 in each of the three chambers are measured under the same environmental conditions, their readings should be consistent (or at least within a certain margin of error). If the readings of a particular sensing element differ significantly from those of the others, it can be determined that the sensing element has failed. By comparing the measurement data from other chambers, the faulty sensing element can be quickly located. This fast and accurate fault location method facilitates timely repairs, preventing inaccurate measurements or data distortion caused by a single reading error. Even if a sensor element fails, the sensors in other cavities continue to function and provide accurate measurement data, ensuring the sensor can continue to provide reliable information at critical moments.

[0059] Example 2: Figure 5As shown, based on Example 1, a stress sensor 10 is further installed at one end of the housing 1 near the front end 8. A central through-hole is also provided on the regular triangular prism in the middle of the three-pronged fixing rod 3. The connecting wire 11 of the stress sensor 10 passes through the central through-hole of the three-pronged fixing rod 3 and the pigtail structure 9 to output a signal to an external device.

[0060] During use, when inserting the optical fiber temperature and humidity sensor into the object being detected, the sensor is generally inserted along the length of the sensor, causing the front end 8 and the housing 1 to be subjected to a resistive stress along the length of the sensor. Furthermore, during the insertion process, when the friction between the optical fiber temperature and humidity sensor and the object is large, it becomes difficult to insert the sensor. The operator then rotates the optical fiber temperature and humidity sensor to effectively reduce the friction and facilitate further insertion. This causes the front end 8 and the housing 1 to be subjected to a torque stress. Similarly, when the sensor is subjected to torque stress, the housing and internal components may twist or bend. The resistive stress and torque stress are then transmitted to the temperature and humidity sensing element 6 mounted on the fiber core 5 inside the housing 1. The temperature and humidity sensing element 6 includes a humidity grating and a temperature grating, and in particular, the surface of the humidity grating is coated with a moisture-sensitive material. Such gratings are very sensitive to changes in stress, and stress changes can cause the grating to deform or the properties of the moisture-sensitive material to change, thereby affecting the response characteristics of the grating.

[0061] After the optical fiber temperature and humidity sensor is inserted, the stress sensor 10 arranged in the housing 1 can detect the resistance stress and torque stress. By analyzing the collected stress data, the specific impact of the stress on the measurement results of the temperature and humidity sensor is determined. The error caused by the stress is subtracted from the original measurement data, which can eliminate the impact of the above stress on the detection results, thereby ensuring the accuracy and reliability of the measurement results.

[0062] Example 3: Based on Example 2, Figures 6-10 As shown, the front end head 8 is further provided with a swivel 17, and an annular limited rotation groove 20 is provided at one end of the housing 1 adjacent to the front end head 8. The swivel 17 is provided with a limit block 19 that slides with the limited rotation groove 20. A torsion spring 21 is further provided between the housing 1 and the swivel 17. When the torsion spring 21 is in an unstressed state, the limit block 19 automatically locates at one end of the limited rotation groove 20. The torsion spring 21 is sleeved on the end of the housing 1, with one end of the torsion spring 21 fixedly connected to the swivel 17 and the other end of the torsion spring 21 fixedly connected to the housing 1.

[0063] The front end head 8 is provided with two slide grooves 16 extending along the length direction of the front end head 8. The two slide grooves 16 are symmetrically arranged. The swivel 17 is provided with two slide rods 18 that slide with the slide grooves 16. Through the cooperation between the slide rods 18 and the slide grooves 16, the swivel 17 and the front end head 8 can only undergo axial relative movement, and cannot undergo relative rotation.

[0064] In addition, two sliders 12 are symmetrically provided at the end of the housing 1 , and a rotation cavity 13 for the sliders 12 to rotate is provided in the front end head 8 , and the depth of the rotation cavity 13 is greater than the thickness of the sliders 12 .

[0065] Two protrusions 14 are symmetrically arranged in the rotating cavity 13. One end of each protrusion 14 is provided with an inclined surface 15. Alternatively, the upper top surface of each protrusion 14 is inclined.

[0066] The distance between the bottom of the protrusion 14 and the bottom of the rotating cavity 13 is consistent with the thickness of the slider 12 .

[0067] In the process of inserting the optical fiber temperature and humidity sensor into the object to be detected, the operator generally adopts a rotational insertion method, that is, the process described in Example 2. After the front end head 8 is inserted into the object to be detected, the front end head 8 will be subjected to resistance and friction from the object to be detected, making the front end head 8 difficult to move. In this way, when the operator rotates the housing 1, the front end head 8 is difficult to rotate, and the front end head 8 through the slide groove 16 and the slide rod 18 also makes it difficult for the swivel 17 to rotate. In the initial stage, the limit block 19 is automatically positioned at one end of the limit rotation groove 20 under the action of the torsion spring 21. When the operator operates the housing 1 to rotate in the set direction, the limit block 19 slides in the limit rotation groove 20, so that the housing 1 will rotate relative to the swivel 17. The idling of the housing 1 buffers the force applied to the optical fiber temperature and humidity sensor during the rotation process. When the limit block 19 rotates to the other end of the limit rotation groove 20, the side wall of the limit rotation groove 20 cooperates with the limit block 19 to drive the swivel 17 to rotate. During this process, the torsion spring 21 is subjected to force and accumulates elastic potential energy.

[0068] At the same time, the slider 12 at the end of the housing 1 also rotates within the rotation cavity 13. The height of the cavity 13 wall is greater than the thickness of the slider 12, creating a clearance fit between the housing 1 and the front end 8. When the slider 12 rotates to the bottom of the protrusion 14, the fit between the housing 1 and the front end 8 changes from a clearance fit to a transition fit. The angle required for the slider 12 to rotate from its initial position to fully engage the bottom of the protrusion 14 coincides with the central angle of the limited rotation groove 20. Therefore, when the limit block 19 rotates to the other end of the limited rotation groove 20, the slider 12 rotates from its initial position to the bottom of the protrusion 14. The axial movement of the housing 1 disperses the resistance experienced by the entire optical fiber temperature and humidity sensor during insertion into the object being tested. The inclined surface 15 at one end of the protrusion 14, or the top surface of the protrusion 14, is inclined to provide guidance for the slider 12 from initial contact with the protrusion 14 until it reaches the bottom of the protrusion 14.

[0069] After the insertion is completed, the staff stops moving the optical fiber temperature and humidity sensor. At this time, the swivel 17 will rotate in the opposite direction under the action of the torsion spring 21. The swivel 17 drives the front end head 8 to rotate synchronously through the slide rod 18 and the slide groove 16, and the slider 12 moves out from the bottom of the protrusion 14 in the opposite direction, that is, at this time, the front end head 8 and the shell 1 are restored to a clearance fit. In the above process, the reverse rotation of the front end head 8 can unload the torque stress described in Example 2. At the same time, after the front end head 8 and the shell 1 are reset from a clearance fit to a clearance fit, the resistance stress along the length direction of the optical fiber temperature and humidity sensor described in Example 2 can be unloaded, so that the influence of the two stresses of resistance stress and torque stress on the detection result can be reduced. Even if the resistance of the front end head 8 is large and cannot be completely reset inside the object to be detected, the stress sensor 10 can also detect and transmit the stress value of the optical fiber temperature and humidity sensor after it is reset and stabilized, and eliminate the error caused by stress through data processing, thereby ensuring the accuracy and reliability of the measurement result.

[0070] Example 4: Based on Example 2, Figure 11-Figure 15 As shown, two symmetrically arranged arc-shaped first limit slots 23 are provided on the front end head 8, and an annular second limit slot 25 is provided at the end adjacent to the front end head 8 of the shell 1. Two first limit sliders 22 are provided on one side of the swivel 17, and two second limit sliders 24 are provided on the other side corresponding to the position of the first limit slider 22. The swivel 17 slides with the first limit slot 23 and the second limit slot 25 respectively through the first limit slider 22 and the second limit slider 24. A torsion spring 21 is provided between the shell 1 and the swivel 17, and an annular groove for the torsion spring 21 to move is provided on the shell 1, and the two ends of the torsion spring 21 are fixedly connected to the shell 1 and the swivel 17 respectively.

[0071] Two mounting cavities 26 are symmetrically provided inside the second limiting sliding groove 25 . A shift rod 28 extending along the length direction of the sensor is provided in the mounting cavity 26 . A driving device is fixedly connected to the end of the mounting cavity 26 to drive the shift rod 28 to move along its axial direction.

[0072] Preferably, the driving device includes an electromagnet 29 fixedly arranged at the bottom of the mounting cavity and a slip ring 27 slidably connected to the mounting cavity. The electromagnet is connected to the slip ring 27 through a spring 30, and the gear rod 28 is fixedly connected to the slip ring 27. When the electromagnet 29 is energized, it will generate a magnetic force to attract the slip ring 27 to move in the direction of the electromagnet 29, thereby driving the gear rod 28 to retract into the mounting cavity 26, preventing the gear rod 28 from obstructing the movement of the second limit slider 24. The spring 30 is compressed and accumulates elastic potential energy in this process; when the electromagnet 29 is de-energized, the electromagnet 29 loses its magnetic force, and under the action of the spring 30, the slip ring 27 drives the gear rod to extend out of the mounting cavity. At this time, the gear rod cooperates with or limits the second limit slider 24.

[0073] In the initial state, the second limit slider 24 on the swivel 17 is spaced apart from the shift rod 28 in the second limit slot 25, and the first limit slider 22 on the other side of the swivel 17 is set close to one of the side walls of the first limit slot 23. The electromagnet 29 is de-energized, causing the shift rod 28 to extend out of the mounting cavity 26.

[0074] When the staff operates the shell 1 to rotate, the shell 1 rotates first, thereby driving the symmetrically arranged gear lever 28 to rotate. Because the second limit slider 24 on the swivel 17 and the gear lever 28 in the second limit slot 25 are staggered, the shell 1 is in an idling state at this time. Until the gear lever 28 rotates to contact the second limit slider 24, the shell 1 is rotated again. Under the action of the gear lever 28 and the second limit slider 24, the shell 1 and the swivel 17 start to move synchronously. The first limit slider 24 on the other side of the swivel 17 is located on one side of the first limit slot 23. At this time, there are two working conditions.

[0075] Under the first working condition, the first limit slider 22 fits with the side wall on the opposite side of the movement direction of the first limit slot 23. Then, the outer shell 1 continues to rotate, and the swivel 17 moves synchronously with the outer shell 1. The first limit slider 22 slides in the first limit slot 23 until it fits with the side wall on the other side of the first limit slot 23. The first limit slider 22 cooperates with the first limit slot 23 to drive the front end head 8 to rotate.

[0076] Under the second working condition, the first limit slider 22 is in contact with the side wall of the first limit slide groove 23 on the side of the movement direction of the first limit slide groove 23. Then, the outer shell 1 continues to rotate, and the swivel 17 moves synchronously with the outer shell 1. At the same time, the swivel 17 synchronously drives the front end head 8 to rotate with the cooperation of the first limit slider 22 and the first limit slide groove 23.

[0077] Regardless of the above working conditions, after the insertion is completed, the staff stops moving the optical fiber temperature and humidity sensor. At this time, the electromagnet 29 is energized, and the lever 28 is retracted into the mounting cavity 26 under the drive of the slip ring. The lever 28 no longer hinders the reverse rotation of the second limit slider 24. The swivel 17 can rotate in the reverse direction and reset under the action of the torsion spring 21. The first limit slider 22 on the swivel 17 is now located at the side wall position on the side of the initial movement direction of the first limit slider 22 in the first limit slot 23. The first limit slot 23 also does not hinder the reverse rotation of the first limit slider 22. Therefore, the swivel 17 can rotate in the reverse direction freely, thereby removing the torque stress described in Example 2. The above technical solution avoids the problem that the front end head 8 is unable to fully reset due to the large resistance it encounters within the detected object, thereby eliminating the influence of torque stress on the detection results. At this time, the stress sensor 10 only needs to detect the value of the resistance stress experienced by the optical fiber temperature and humidity sensor, and eliminates the error caused by stress through data processing, thereby ensuring the accuracy and reliability of the measurement results.

[0078] Embodiment 5: The main difference between this embodiment and embodiment 1 is that: in embodiment 1, the through holes 4 are spaced apart along the length direction of the three-pronged fixing rod 3. In this embodiment, the through holes 4 are long holes extending along the length direction of the three-pronged fixing rod 3.

[0079] Embodiment 6: The main difference between this embodiment and embodiment 3 is that: in embodiment 3, one end of the protrusion 14 is provided with an inclined surface 15. In this embodiment, one end of the protrusion 14 can also be provided with a curved surface.

[0080] Example 7: This embodiment differs from Example 3 primarily in that, in Example 3, two sliders 12 are symmetrically provided at the end of the housing 1, and two protrusions 14 are symmetrically provided on the rotating cavity 13 within the front end head 8. In this embodiment, only one slider 12 may be provided at the end of the housing 1, and only one protrusion 14 may be provided within the rotating cavity 13. Of course, in other embodiments, the number of sliders 12 and protrusions 14 may be adjusted based on actual needs.

[0081] Example 8: This embodiment differs from Example 3 primarily in that, in Example 3, two symmetrically provided chute grooves 16 and correspondingly two symmetrically provided slide bars 18 are provided. In this embodiment, only one chute groove 16 and correspondingly only one slide bar 18 may be provided. Of course, in other embodiments, the number of chute grooves 16 and slide bars 18 may be adjusted based on actual needs.

[0082] Embodiment 9: The main difference between this embodiment and embodiment 4 is that the driving device in embodiment 4 is an electromagnet 29 and a slip ring 27 and a spring 30 that cooperate with the electromagnet 29. Of course, in other embodiments, it can also be set as an electric push rod, in which case the output shaft of the electric push rod is connected to the gear lever 28.

[0083] Example 10: This differs from Example 4 primarily in that, in Example 4, two first limit sliders 22 and two second limit sliders 24 are symmetrically provided on either side of the swivel 17. In this example, only one first limit slider 22 and one second limit slider 24 may be provided on either side of the swivel 17, or the two may be staggered. Of course, in other examples, the number and positional relationship of the first limit sliders 22 and second limit sliders 24 may be adjusted based on actual needs.

[0084] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An optical fiber temperature and humidity sensor, comprising a housing (1), wherein the housing (1) is provided with a plurality of hollow portions (2) at intervals, a conical front end (8) is provided at one end of the housing (1), and a pigtail structure (9) is installed at the other end of the housing (1), characterized in that: A three-pronged fixing rod (3) is fixedly connected to the inner wall of the housing (1), and the three-pronged fixing rod (3) divides the interior of the housing (1) into three independent cavities. A through hole (4) is provided on the three-pronged fixing rod (3) to connect adjacent cavities. A fiber core (5) is provided in each cavity, and the fiber core (5) is fixed to the three-pronged fixing rod (3) via a fixing member (7); The ends of the fiber cores (5) pass through the pigtail structure (9) to achieve signal output, and each fiber core (5) is provided with a plurality of temperature and humidity sensing element areas (6) corresponding to the hollow portions (2) on the housing (1) at intervals; The front end head (8) is provided with a rotating ring (17), an arc-shaped limit rotation groove (20) is provided at one end of the housing (1) adjacent to the front end head (8), a limit block (19) is provided on the rotating ring (17) and is slidably matched with the limit rotation groove (20), and a torsion spring (21) is further provided between the housing (1) and the rotating ring (17). When the torsion spring (21) is in an unstressed state, the initial position of the limit block (19) is located at one end of the limit rotation groove (20); The end of the housing (1) is further provided with a slider (12), and the front end head (8) is provided with a rotation cavity (13) for the slider (12) to rotate. The height of the wall of the rotating cavity (13) is greater than the thickness of the slider (12), so that a clearance fit is formed between the shell (1) and the front end head (8). A protrusion (14) is also provided in the rotating cavity (13). When the slider (12) rotates to the bottom of the protrusion (14), the fit between the shell (1) and the front end head (8) changes from a clearance fit to a transition fit. The slider (12) rotates from the initial position to the angle required with the bottom of the protrusion (14) and is consistent with the central angle of the limiting rotating groove (20). The front end head (8) is also provided with a slide groove (16) extending along the length direction of the front end head (8), and the rotating ring (17) is provided with a slide rod (18) that cooperates with the slide groove (16).

2. The optical fiber temperature and humidity sensor according to claim 1, characterized in that: The through holes (4) are spaced apart along the length direction of the three-pronged fixing rod (3); or, the through holes (4) are long holes extending along the length direction of the three-pronged fixing rod (3).

3. The optical fiber temperature and humidity sensor according to claim 1 or 2, characterized in that: A stress sensor (10) for detecting stress on the front end (8) and the housing (1) is fixed inside the housing (1), and a connecting line (11) on the stress sensor (10) passes through the central through-hole of the three-pronged fixing rod (3) and the pigtail structure (9) to output a signal.

4. The optical fiber temperature and humidity sensor according to claim 3, characterized in that: The limiting rotation groove (20) on the housing (1), the slider (12) and the sliding groove (16) provided on the front end head (8) are all symmetrically provided with two, and one end of the protrusion (14) is provided with an inclined surface (15) or the top surface of the protrusion (14) is inclined.

5. An optical fiber temperature and humidity sensor, comprising a housing (1), wherein the housing (1) is provided with a plurality of hollow portions (2) at intervals, a conical front end (8) is provided at one end of the housing (1), and a pigtail structure (9) is installed at the other end of the housing (1), characterized in that: A three-pronged fixing rod (3) is fixedly connected to the inner wall of the housing (1), and the three-pronged fixing rod (3) divides the interior of the housing (1) into three independent cavities. A through hole (4) is provided on the three-pronged fixing rod (3) to connect adjacent cavities. A fiber core (5) is provided in each cavity, and the fiber core (5) is fixed to the three-pronged fixing rod (3) via a fixing member (7); The ends of the fiber cores (5) pass through the pigtail structure (9) to achieve signal output, and each fiber core (5) is provided with a plurality of temperature and humidity sensing element areas (6) corresponding to the hollow portions (2) on the housing (1) at intervals; The front end head (8) is provided with an arc-shaped first limiting groove (23), and the end of the housing (1) adjacent to the front end head (8) is provided with an annular second limiting groove (25). The rotating ring (17) slides with the first limiting groove (23) and the second limiting groove (25) respectively through a first limiting slider (22) and a second limiting slider (24) provided on the side. A torsion spring (21) is also provided between the housing (1) and the rotating ring (17). The second limiting groove (25) is also provided with an installation cavity (26). The installation cavity (26) is also provided with a gear rod (28) extending along the length direction of the optical fiber temperature and humidity sensor. The end of the installation cavity (26) is fixedly connected with a driving device to drive the gear rod (28) to move along its axial direction. The second limiting slider (24) and the gear rod (28) in the second limiting groove (25) are staggered.

6. The optical fiber temperature and humidity sensor according to claim 5, characterized in that: Two first limiting sliders (22) and two second limiting sliders (24) are symmetrically provided on both sides of the rotating ring (17), and the positions of the first limiting sliders (22) and the second limiting sliders (24) correspond to each other. Two mounting cavities (26) are provided and are symmetrically arranged in the second limiting sliding groove (25).

7. The optical fiber temperature and humidity sensor according to claim 5, characterized in that: The driving device includes an electromagnet (29) fixedly arranged at the bottom of the installation cavity (26) and a slip ring (27) slidably connected in the installation cavity (26), the electromagnet (29) is connected to the slip ring (27) via a spring (30), and the shift rod (28) is fixedly connected to the slip ring (27).

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