Optical fiber temperature and humidity sensor

Abstract

The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber temperature and humidity sensor. A shell of the optical fiber temperature and humidity sensor is provided with a plurality of hollow parts at intervals, the inner wall of the shell is fixedly connected with a three-fork fixing rod, the three-fork fixing rod divides the interior of the shell into three mutually independent cavities, the three-fork fixing rod is provided with a through hole to communicate the adjacent cavities, each cavity is internally provided with a fiber core, and the fiber core is provided with a plurality of through holes. The fiber cores are fixed on the trifurcate fixing rod through fixing pieces, and each fiber core is provided with a plurality of temperature and humidity sensing element areas which are in one-to-one correspondence with the hollowed-out parts on the shell at intervals. The three-fork fixing rod on the inner wall of the shell not only remarkably enhances the deformation resistance of the shell, but also divides the interior of the shell into three independent cavities, and the corresponding temperature and humidity sensing element areas in the three cavities synchronously detect the temperature and humidity of the same depth in a detected object, so that the measurement accuracy and reliability are remarkably improved.

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 is crucial for the storage environment of 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, accurate management of temperature and humidity plays a decisive role in preventing mold and maintaining taste and nutritional value. At present, 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 it is difficult to effectively penetrate the densely stacked material piles to achieve accurate monitoring of the core areas. This monitoring blind spot leads to insufficient overall grasp of storage conditions and difficulty in ensuring that all storage areas are in optimal condition. Therefore, the development of a technology that can monitor temperature and humidity in-depth 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, and the front end connector of the sensor is connected to the inner 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 inner 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, so as to realize quasi-distributed measurement of the internal environment temperature and humidity of the tobacco pile.

[0004] However, in actual use, the hollow design on the fiber optic bundle packaging shell is conducive to environmental interaction, but 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 leads to 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: The optical fiber temperature and humidity sensor comprises a shell, a plurality of hollow parts are arranged on the shell at intervals, a conical front end head is arranged at one end of the shell, a pigtail structure is installed at the other end of the shell, a three-pronged fixing rod is fixedly connected to the inner wall of the shell, the three-pronged fixing rod divides the interior of the shell into three independent cavities, a through hole is arranged on the three-pronged fixing rod to connect adjacent cavities, a fiber core is arranged in each cavity, and the fiber core is fixed to the three-pronged fixing rod through a fixing member; The ends of the fiber cores pass through the pigtail structure to realize signal output, and each fiber core is provided with a plurality of temperature and humidity sensing element areas corresponding to the hollowed-out parts on the shell at intervals.

[0008] 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 sensor element area, and improving the accuracy of the measurement.

[0009] The through-hole design on the three-pronged fixing rod enables adjacent cavities to be interconnected, achieving a balance of temperature and humidity information. At the same time, each fiber core is provided with a temperature and humidity sensor element area corresponding to the hollowed-out part of the outer shell. Because the detection environment in the three cavities remains the same, the corresponding temperature and humidity sensor element areas in the three cavities can synchronously detect the temperature and humidity at the same depth inside the detected object, significantly improving the accuracy and reliability of the measurement. Even if a sensor element fails, the sensor elements in other cavities can still continue to work and provide accurate measurement data, ensuring that the sensor can continue to provide reliable information at critical moments.

[0010] Furthermore, the through holes provided on the three-pronged fixing rod are distributed at intervals along the length direction thereof; or, the through holes are long holes extending along the length direction of the three-pronged fixing rod.

[0011] The through holes are spaced or formed into long holes along the length of the three-pronged fixed rod, which helps to speed up the transmission of temperature and humidity between adjacent cavities. When the temperature and humidity of the external environment change, this design can quickly transmit the change information to each cavity through the through hole, so that the sensor can reach a new equilibrium state faster, thereby improving the response speed and accuracy of the measurement.

[0012] Long holes or spaced through holes also reduce the amount of material used in the three-pronged 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.

[0013] 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.

[0014] When it is difficult for the fiber optic temperature and humidity sensor to penetrate the interior of the object to be detected, the operator can rotate the fiber optic temperature and humidity sensor to effectively reduce friction to facilitate further penetration. During the process of rotating and penetrating the object to be detected, the front end head and the outer shell will be subjected to resistance stress and torque stress. The stress sensor can accurately detect the data of the above stress, so that after the fiber optic 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 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.

[0015] Furthermore, a swivel is provided on the front end head, an arc-shaped limit rotation groove is provided on 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.

[0016] The torsion spring is set to limit the initial position of the limit block, and in the process of rotating the optical fiber temperature and humidity sensor in the set direction to penetrate the object to be detected, the initial idling of the housing is cleverly achieved through the sliding cooperation between the limit rotation groove and the limit block, and the idling of the housing disperses the torque stress on the optical fiber temperature and humidity sensor during the rotation process. After the operation is completed, the torsion spring drives the rotating ring to reverse and reset, releasing the torque stress on the optical fiber temperature and humidity sensor.

[0017] The optical fiber temperature and humidity sensor can adaptively adjust and release the torque stress on the optical fiber temperature and humidity sensor during operation, thereby reducing the influence of the torque stress on the measurement result and significantly improving the measurement accuracy. Even if the front end head and the swivel cannot be completely reset due to the friction of the object being detected, the stress sensor can still collect stress data that has not been completely eliminated for correction processing, thereby eliminating the influence of stress on the detection result.

[0018] Furthermore, a slider is provided at the end of the shell, and a rotating cavity for the slider to rotate is provided in the front end head.

[0019] The cooperation between the slider and the rotating cavity increases the connection strength between the housing and the front end, making the entire optical fiber temperature and humidity sensor more stable when piercing the object to be detected and less prone to deformation or damage. This design improves the durability and reliability of the sensor.

[0020] Furthermore, the height of the rotating chamber 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 chamber. 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 an initial position to an 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 matching the slide groove is provided on the rotating ring.

[0021] When the slider just reaches the bottom of the convex block, the limit block just rotates from one end of the limit rotation groove to the other end, and the housing and the front end head can be transformed from a clearance fit to a transition fit. When the torsion spring drives the swivel to reverse and reset, the slider also reverses, so that the housing and the front end head return to a clearance fit to achieve the unloading of the resistance stress in the length direction of the optical fiber temperature and humidity sensor.

[0022] In the process of adaptively adjusting and releasing torque stress, the optical fiber temperature and humidity sensor simultaneously realizes the adjustment and release of resistance stress, which reduces the influence of external stress on the measurement results of the optical fiber temperature and humidity sensor as a whole and significantly improves the measurement accuracy.

[0023] Furthermore, the limiting rotation groove on the shell, the sliding block and the sliding groove arranged on the front end head are all symmetrically provided with two, and one end of the protrusion is provided with a slope or the top surface of the protrusion is inclined.

[0024] The limited rotation groove on the shell, the slider and the slide groove set on the front end head are symmetrically designed, and the corresponding structures matched therewith 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.

[0025] Furthermore, an arc-shaped first limit slide groove is provided on the front end head, and an annular second limit slide groove is provided on the end of the shell adjacent to the front end head. The swivel ring slides with the first limit slide groove and the second limit slide groove respectively through the first limit slide block and the second limit slide block arranged on the side. A torsion spring is also provided between the shell and the swivel ring. An installation cavity is also provided inside the second limit slide groove. 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.

[0026] The initial position of the second limit slider is limited by setting a torsion spring, and when the optical fiber temperature and humidity sensor is operated to rotate in any direction to penetrate the object to be detected, the initial idling of the shell is cleverly achieved through the staggered arrangement of the second limit slider and the gear lever, and the idling of the shell is used to disperse the torque stress on the optical fiber temperature and humidity sensor during rotation.

[0027] 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 arranged on the front end head, so that the swivel is connected with the rotation of the front end head when resetting, 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 resetting. The torsion spring can drive the swivel to reverse and achieve complete resetting, 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.

[0028] Furthermore, two first limit sliders and two second limit sliders are symmetrically arranged on both sides of the swivel, and the positions of the first limit sliders correspond to those of the second limit sliders. Two mounting cavities are provided and symmetrically arranged in the second limit sliding groove.

[0029] The symmetrically designed first limit slider and second limit slider can ensure that the swivel remains balanced when rotating and reduce vibration or deformation caused by uneven force. The corresponding positions of the first limit slider and the second limit slider easily ensure that the two sliders are correctly matched with their respective slide grooves.

[0030] 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.

[0031] 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.

[0032] The beneficial technical effects of the present invention are: The fiber optic temperature and humidity sensor adopts a three-pronged fixed rod to separate the internal cavity, sets through holes to balance the temperature and humidity information, integrates a stress sensor to eliminate the influence of stress, and uses torsion springs, swivels, sliders 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

[0033] Figure 1 is a schematic diagram of the external structure of the first embodiment of the present invention; Figure 2 is a cross-sectional view of a housing of Embodiment 1 of the present invention; Figure 3 Schematic diagram of a three-pronged fixing rod according to Embodiment 1 of the present invention; Figure 4 is a cross-sectional view of the first embodiment of the present invention; Figure 5 is a cross-sectional view of a second embodiment of the present invention; Figure 6 is a cross-sectional view of a third embodiment of the present invention; Figure 7 is an enlarged view of the insertion end of the third embodiment of the present invention; Figure 8 is a schematic diagram of the cooperation between the slider and the protrusion in the third embodiment of the present invention; Fig. 9 This is a schematic diagram of the decomposition of the third embodiment of the present invention. Figure 1 ; Fig.10 This is a schematic diagram of the decomposition of the third embodiment of the present invention. Figure 2 ; Figure 6 is a cross-sectional view of a third embodiment of the present invention; Figure 7 is an enlarged view of the insertion end of the third embodiment of the present invention; Figure 8 is a schematic diagram of the cooperation between the slider and the protrusion in the third embodiment of the present invention; Fig. 9 This is a schematic diagram of the decomposition of the third embodiment of the present invention. Figure 1 ; Fig.10 This is a schematic diagram of the decomposition of the third embodiment of the present invention. Figure 2 ; Fig.11 The insertion end amplifier of the fourth embodiment of the present invention Figure 1 ; Fig.12 The insertion end amplifier of the fourth embodiment of the present invention Figure 2 ; Fig.13 is a schematic diagram of the cooperation between the housing and the rotating ring of the fourth embodiment of the present invention; Fig.14 This is a schematic diagram of the decomposition of the fourth embodiment of the present invention. Figure 1 ; Fig.15 This is a schematic diagram of the decomposition of the fourth embodiment of the present invention. Figure 2 ; 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. swivel; 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. installation cavity; 27. slip ring; 28. gear lever; 29. ​​electromagnet; 30. spring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0035] Example 1: Figure 1 As shown, an optical fiber temperature and humidity sensor includes a housing 1, the housing 1 is cylindrical, and the housing 1 is provided with a plurality of hollow parts 2 spaced apart in the circumferential direction, and the hollow parts 2 are in the shape of a ring. A conical front end head 8 is provided at one end of the housing 1, and the front end head 8 is connected to the inner thread of the housing 1; the conical front end head 8 can reduce the resistance encountered by the sensor when it is inserted into the interior of the detected object to a certain extent. A pigtail structure 9 is installed at the other end of the housing 1, and the pigtail structure 9 is also connected to the inner thread of the housing 1. The pigtail structure 9 is provided with a perforation, and a fiber core 5 is provided in the housing 1, and the end of the fiber core 5 passes through the perforation of the pigtail structure 9 to realize signal output.

[0036] like Figure 2-Figure 4 As shown, a three-pronged fixing rod 3 is fixedly connected to the inner wall of the shell 1. The three-pronged fixing rod 3 is composed of a regular triangular prism in the middle and three fork bodies extending outward from the side edges. The tail ends of each fork body of the three-pronged fixing rod 3 are fixedly connected to the inner wall of the shell 1, thereby dividing the interior of the shell 1 into three independent cavities. The three-pronged fixing rod 3 enhances the structural strength of the entire sensor, reduces the sensor deformation caused by external stress changes, and thus ensures the stability of the internal fiber core 5.

[0037] 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 interconnected, thereby achieving sharing and balancing 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.

[0038] The three cavities are all provided with a fiber core 5, which is fixed on the three-pronged fixing rod 3 through a plurality of fixing members 7. A plurality of temperature and humidity sensing element areas 6 are installed on the fiber core 5, and the plurality of temperature and humidity sensing element areas 6 are respectively located at the corresponding positions of the plurality of hollow parts 2. The number, length and hollow density of the hollow parts 2 of the housing can also be appropriately adjusted according to actual needs. The temperature and humidity sensing element area 6 includes a humidity grating and a temperature grating, and the surface of the humidity grating is also coated with a humidity sensitive material.

[0039] When in use, the optical fiber temperature and humidity sensor is held vertically so that the front end head 8 is located at the lower end. The resistance received by the optical fiber temperature and humidity sensor when inserted into the object to be detected is reduced by setting the front end head 8 to a cone. A three-pronged fixing rod 3 is also fixed in the housing 1. During the process of inserting the optical fiber temperature and humidity sensor into the object to be detected, the pressure borne by the housing 1 to the outside can be transmitted to the three-pronged fixing rod 3. The three-pronged fixing rod 3 is provided to significantly improve the structural strength of the housing 1, significantly improve the service life of the optical fiber temperature and humidity sensor, and effectively avoid the problem that the housing 1 is compressed and deformed and squeezed into the temperature and humidity sensing element area 6, causing damage to the optical fiber temperature and humidity sensor.

[0040] In addition, the three-pronged fixed rod 3 divides the interior of the housing 1 into three cavities, each of which is provided with a fiber core 5, and a plurality of temperature and humidity sensing element areas 6 are installed on the fiber core 5. The temperature and humidity conditions inside the detected object are transmitted from the hollow part 2 of the housing 1 into the housing 1, and each temperature and humidity sensing element area 6 corresponds to the hollow part 2. At the same time, the plurality of through holes 4 on the three-pronged fixed rod 3 connect the three cavities, so that the detection environment in the three cavities remains the same, so that the corresponding temperature and humidity sensing element areas 6 in the three cavities synchronously detect the temperature and humidity at the same depth inside the detected object, which significantly improves the accuracy and reliability of the measurement. Since the temperature and humidity sensing element areas 6 in the three cavities are measured under the same environmental conditions, their readings should be consistent (or at least within the error range). If the reading of a certain sensing element is significantly different from that of other elements, it can be judged that the sensing element has failed. By comparing the measurement data of other cavities, the failed sensing element can be quickly located. This fault location method is not only fast but also accurate, which helps to take timely repair measures, thus avoiding inaccurate measurements or data distortion caused by single reading errors. Even if a sensor element fails, the sensor elements in other cavities can still continue to work and provide accurate measurement data, ensuring that the sensor can continue to provide reliable information at critical moments.

[0041] Example 2: Figure 5As shown, on the basis of embodiment 1, a stress sensor 10 is further installed at one end of the housing 1 close to the front end head 8. A central through hole is also provided on the regular triangular prism in the middle of the three-pronged fixing rod 3, 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 to an external device.

[0042] During use, in the process of inserting the optical fiber temperature and humidity sensor into the detected object, the optical fiber temperature and humidity sensor is generally inserted into the detected object along the length direction of the optical fiber temperature and humidity sensor, so that the front end head 8 and the housing 1 will be subjected to the resistance stress along the length direction of the optical fiber temperature and humidity sensor. And during the insertion process, when the friction between the optical fiber temperature and humidity sensor and the detected object is large, it will be difficult to insert the optical fiber temperature and humidity sensor, and the operator will rotate the optical fiber temperature and humidity sensor to effectively reduce the friction for further insertion, so that the front end head 8 and the housing 1 will be subjected to torque stress. Similarly, when the sensor is subjected to torque stress, the housing and internal components may be twisted or bent. The above-mentioned resistance stress and torque stress will then be transmitted to the temperature and humidity sensing element area 6 installed on the fiber core 5 inside the housing 1, and the temperature and humidity sensing element area 6 contains humidity grating and temperature grating, especially the surface of the humidity grating is also coated with a humidity-sensitive material, and this type of grating is very sensitive to stress changes, and stress changes will cause deformation of the grating or property changes of the humidity-sensitive material, thereby affecting the response characteristics of the grating.

[0043] After the fiber optic temperature and humidity sensor is inserted, the stress sensor 10 arranged in the outer shell 1 can detect the resistance stress and torque stress. After analyzing the collected stress data, the specific influence of stress on the measurement result of the temperature and humidity sensor is determined, and the error part caused by stress is subtracted from the original measurement data. The influence of the above stress on the detection result can be eliminated, thereby ensuring the accuracy and reliability of the measurement result.

[0044] Embodiment 3: Based on embodiment 2, Figure 6-Figure 10 As shown, the front end head 8 is also provided with a swivel 17, an annular 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 swivel 17 to slide with the limit rotation groove 20, and a torsion spring 21 is also provided between the housing 1 and the swivel 17. When the torsion spring 21 is in an unstressed state, the limit block 19 is automatically positioned at one end of the limit rotation groove 20. The torsion spring 21 is sleeved on the end of the housing 1, one end of the torsion spring 21 is fixedly connected to the swivel 17, and the other end of the torsion spring 21 is fixedly connected to the housing 1.

[0045] The front end head 8 is provided with two slide grooves 16 extending along the length direction of the front end head 8, and 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, only axial relative movement but no relative rotation can occur between the swivel 17 and the front end head 8.

[0046] In addition, two sliders 12 are symmetrically provided at the ends 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 .

[0047] 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 arranged in an inclined manner.

[0048] 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 .

[0049] In the process of inserting the optical fiber temperature and humidity sensor into the detected object, the operator generally adopts the method of rotational insertion, that is, the process described in Example 2. After the front end head 8 is inserted into the detected object, the front end head 8 will be subject to resistance and friction from the detected object, making it difficult for the front end head 8 to move. In this way, when the staff 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 will also make the swivel 17 difficult to rotate. In addition, 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 staff 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 idly relative to the swivel 17, and the idling of the housing 1 is used to buffer 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. In this process, the torsion spring 21 is subjected to force to accumulate elastic potential energy.

[0050] At the same time, the slider 12 at the end of the housing 1 also rotates in the rotating cavity 13. 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 housing 1 and the front end head 8. When the slider 12 rotates to the bottom of the protrusion 14, the fit between the housing 1 and the front end head 8 changes from a clearance fit to a transition fit. The angle required for the slider 12 to rotate from the initial position to fully fit with the bottom of the protrusion 14 is consistent with the center angle of the limit rotation groove 20. Therefore, when the limit block 19 rotates to the other end of the limit rotation groove 20, the slider 12 just rotates from the initial position to the bottom of the protrusion 14, and the axial movement of the housing 1 disperses the resistance of the optical fiber temperature and humidity sensor as a whole during the insertion of the optical fiber temperature and humidity sensor into the object to be detected. The inclined surface 15 at one end of the protrusion 14 or the top surface of the protrusion 14 is inclinedly arranged to provide guidance for the slider 12 in the process from the slider 12 just contacting the protrusion 14 to completely reaching the bottom of the protrusion 14.

[0051] After the insertion is completed, the staff stops moving the optical fiber temperature and humidity sensor. At this time, the rotating ring 17 will rotate in the opposite direction under the action of the torsion spring 21. The rotating ring 17 drives the front end head 8 to rotate synchronously through the slide bar 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 remove 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 removed, 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 inside the detected object is large and cannot be completely reset, the stress sensor 10 can also detect and transmit the stress value of the optical fiber temperature and humidity sensor after the reset is stable, and eliminate the error caused by the stress through data processing, thereby ensuring the accuracy and reliability of the measurement result.

[0052] Embodiment 4: Based on embodiment 2, Figure 11-Figure 15 As shown, two symmetrically arranged arc-shaped first limit slots 23 are provided on the front end head 8, 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 positions of the first limit sliders 22, the swivel 17 is slidably matched with the first limit slot 23 and the second limit slot 25 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, an annular groove for the torsion spring 21 to move is provided on the shell 1, and both ends of the torsion spring 21 are fixedly connected to the shell 1 and the swivel 17 respectively.

[0053] Two installation cavities 26 are symmetrically arranged inside the second limiting sliding groove 25. A shift rod 28 extending along the length direction of the sensor is arranged in the installation cavity 26. A driving device is fixedly connected to the end of the installation cavity 26 to drive the shift rod 28 to move along its axial direction.

[0054] Preferably, the driving device includes an electromagnet 29 fixedly arranged at the bottom of the installation cavity and a slip ring 27 slidably connected in the installation 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 installation cavity 26, so as to prevent the gear rod 28 from hindering 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 powered off, 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 installation cavity, and at this time the gear rod cooperates with or limits the second limit slider 24.

[0055] In the initial state, the second limit slider 24 on the swivel 17 is arranged at intervals 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 arranged close to one side wall of the first limit slot 23, and the electromagnet 29 is powered off so that the shift rod 28 extends out of the mounting cavity 26.

[0056] When the staff operates the shell 1 to rotate, the shell 1 rotates first, thereby driving the symmetrically arranged shift lever 28 to rotate. Since the second limit slider 24 on the swivel 17 and the shift lever 28 in the second limit slot 25 are staggered, the shell 1 is in an idling state at this time, until the shift lever 28 rotates to contact the second limit slider 24, and then the shell 1 is rotated. Under the action of the shift lever 28 and the second limit slider 24, the shell 1 and the swivel 17 start to move synchronously, and 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.

[0057] 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.

[0058] Under the second working condition, the first limit slider 22 fits with the side wall of the first limit slider 22 on the 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. 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 slot 23.

[0059] Regardless of the above working conditions, after the insertion is completed, the staff stops moving the optical fiber temperature and humidity sensor, and at this time, the electromagnet 29 is energized, and the lever 28 is retracted into the installation cavity 26 under the drive of the slip ring, and the lever 28 no longer hinders the reverse rotation of the second limit slider 24. The swivel 17 can be reversely rotated 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 of the first limit slider 22 on the side of the initial movement direction in the first limit slide 23, and the first limit slide 23 will not hinder the reversal of the first limit slider 22, so the swivel 17 can freely rotate in the opposite direction to remove the torque stress described in Example 2. The above technical solution avoids the problem that the front end head 8 is located in the object to be detected and cannot be completely reset due to the large resistance, thereby eliminating the influence of the torque stress on the detection result. At this time, the stress sensor 10 only needs to detect the value of the resistance stress received by the optical fiber temperature and humidity sensor, and eliminates the error caused by the stress through data processing, thereby ensuring the accuracy and reliability of the measurement result.

[0060] Embodiment 5: The main difference between the embodiment 5 and the embodiment 1 is that in the 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.

[0061] Embodiment 6: The main difference between this embodiment and embodiment 3 is that in embodiment 3, one end of the projection 14 is provided with an inclined surface 15. In this embodiment, one end of the projection 14 can also be provided with an arc surface.

[0062] Embodiment 7: The difference between this embodiment and embodiment 3 is that in embodiment 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 in 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 is provided in the corresponding rotating cavity 13. Of course, in other embodiments, the number of sliders 12 and protrusions 14 may be adjusted according to actual needs.

[0063] Embodiment 8: The difference between this embodiment and embodiment 3 is that in embodiment 3, two slide grooves 16 are symmetrically provided, and two corresponding slide bars 18 are also symmetrically provided. In this embodiment, only one slide groove 16 may be provided, and only one corresponding slide bar 18 may be provided. Of course, in other embodiments, the number of slide grooves 16 and slide bars 18 may also be adjusted according to actual needs.

[0064] Embodiment 9: The difference between the embodiment 9 and the embodiment 4 is that the driving device in the 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.

[0065] Embodiment 10: The main difference between the embodiment 10 and the embodiment 4 is that in the embodiment 4, two first limit sliders 22 and two second limit sliders 24 are symmetrically provided on both sides of the rotating ring 17. In the present embodiment, only one first limit slider 22 and one second limit slider 24 may be provided on both sides of the rotating ring 17, and the two may also be staggered. Of course, in other embodiments, the number and position relationship of the first limit slider 22 and the second limit slider 24 may also be adjusted according to actual needs.

[0066] 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 protection scope of the present invention.

Claims

1. An optical fiber temperature and humidity sensor, comprising a housing (1), the housing (1) being provided with a plurality of hollow portions (2) at intervals, one end of the housing (1) being provided with a conical front end head (8), and the other end of the housing (1) being provided with a pigtail structure (9), characterized in that: A three-pronged fixing rod (3) is fixedly connected to the inner wall of the housing (1), the three-pronged fixing rod (3) divides the interior of the housing (1) into three independent cavities, the three-pronged fixing rod (3) is provided with a through hole (4) for connecting adjacent cavities, each cavity is provided with a fiber core (5), and the fiber core (5) is fixed to the three-pronged fixing rod (3) by 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 one to one to the hollowed-out portions (2) on the housing (1) at intervals.

2. The optical fiber temperature and humidity sensor according to claim 1, characterized in that: The through holes (4) are distributed at intervals 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. An 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 head (8) and the housing (1) is fixed inside the housing (1), and a connecting line (11) on the stress sensor (10) passes through a central through hole of the three-pronged fixing rod (3) and a pigtail structure (9) to output a signal.

4. The optical fiber temperature and humidity sensor according to claim 3, characterized in that: 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), and 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).

5. The optical fiber temperature and humidity sensor according to claim 4, characterized in that: A slider (12) is also provided at the end of the housing (1), and a rotation chamber (13) for the slider (12) to rotate is provided in the front end head (8).

6. The optical fiber temperature and humidity sensor according to claim 5, characterized in that: The height of the cavity wall of the rotating cavity (13) is greater than the thickness of the slider (12), so that a clearance fit is formed between the housing (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 housing (1) and the front end head (8) changes from a clearance fit to a transition fit. The slider (12) rotates from an initial position to a required angle with the bottom of the protrusion (14) that is consistent with the center 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).

7. The optical fiber temperature and humidity sensor according to claim 6, characterized in that: The limiting rotation groove (20) on the housing (1), the slider (12) and the slide 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.

8. The optical fiber temperature and humidity sensor according to claim 3, characterized in that: The front end head (8) is provided with an arc-shaped first limiting groove (23), and an annular second limiting groove (25) is provided at one end of the housing (1) adjacent to the front end head (8). The rotating ring (17) is slidably matched 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) arranged 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). A shift rod (28) extending along the length direction of the optical fiber temperature and humidity sensor is also provided in the installation cavity (26). The end of the installation cavity (26) is fixedly connected with a driving device to drive the shift rod (28) to move along its axial direction. The second limiting slider (24) and the shift rod (28) in the second limiting groove (25) are arranged in a staggered manner.

9. The optical fiber temperature and humidity sensor according to claim 8, characterized in that: Two first limit sliders (22) and two second limit sliders (24) are symmetrically arranged on both sides of the rotating ring (17), and the positions of the first limit sliders (22) and the second limit sliders (24) correspond to each other. Two mounting cavities (26) are symmetrically arranged in the second limit sliding grooves (25).

10. The optical fiber temperature and humidity sensor according to claim 8, characterized in that: The driving device comprises 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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