Optical fiber type periodic measurement sensor

Abstract

The utility model provides an optical fiber type period measurement sensor, which comprises an optical fiber probe, a plurality of reflectors, a Y-shaped optical fiber, an infrared transmitting tube, an infrared receiving tube, a support frame and a lifting assembly, the optical fiber probe is respectively connected with the infrared transmitting tube and the infrared receiving tube through the Y-shaped optical fiber, one end of the support frame is provided with the optical fiber probe, and the other end of the support frame is provided with the Y-shaped optical fiber. When the optical fiber sensor is used as a speed measuring sensor, the plurality of reflectors are distributed on the upper surface of a rotating shaft of an object to be measured or are uniformly distributed along the circumferential direction of the rotating shaft of the object to be measured; the rotating speed of the to-be-measured object is calculated according to the number of the pulse periods and the number of the reflectors; when the sensor is used as a counting sensor, the plurality of reflectors are arranged on the plurality of objects to be measured in a one-to-one correspondence manner so as to obtain the number of pulse periods and calculate the number of the objects to be measured. The precision of the optical fiber type period measurement sensor is controllable, and the optical fiber type period measurement sensor is suitable for various occasions.

Description

Technical Field

[0001] The utility model belongs to the technical field of optoelectronic detection, and particularly relates to a fiber optic periodic measurement sensor. Background Art

[0002] The measurement of rotational speed and counting is an important part of engineering tests. The methods for measuring rotational speed and counting can be divided into analog method, counting method and equivalent method according to the measurement principle; and can be divided into mechanical type, electrical type, photoelectric type and stroboscopic type according to the switching method. In actual measurement, magnetoelectric sensor digital tachometers, photoelectric tachometers and Hall tachometers are often used to measure rotational speed. With the development of sensor technology, the research and application of fiber optic sensors have become a hot topic. Due to the advantages of high sensitivity, high measurement accuracy, fast response, light weight, small size, bendable optical path, anti-electromagnetic interference, etc., fiber optic sensors have been widely used in the measurement of physical quantities such as displacement, counting, rotational speed, sound, flow, pressure, concentration, light, electricity and magnetism. Liu Yuyan et al. mentioned in the literature that the fiber optic sensor is of Y-shaped structure, in which the light source fiber and the receiving fiber are each cut in half and spliced into a fiber optic probe to detect distance and rotational speed, but it cannot be adjusted according to the accuracy requirements of the experiment. Content of the Utility Model

[0003] Based on the existing technical problems, the utility model provides a fiber optic periodic measurement sensor to solve the technical problem that the measurement of the rotational speed of the object to be measured cannot be adjusted according to the accuracy requirements of the experiment.

[0004] In order to achieve the above object, the utility model adopts the following technical solutions.

[0005] According to the technical solution of the utility model, a fiber optic periodic measurement sensor is provided, which includes a fiber optic probe, a plurality of reflectors, a Y-shaped optical fiber, an infrared emitting tube, an infrared receiving tube, a support frame and a lifting assembly; the fiber optic probe is respectively connected to the infrared emitting tube and the infrared receiving tube through the Y-shaped optical fiber; the fiber optic probe is spaced above the plurality of reflectors, and the fiber optic probe can emit light to each reflector passing below it and receive the light reflected by each reflector; one end of the support frame is provided with the fiber optic probe, and the other end of the support frame is arranged at the lifting end of the lifting assembly; the lifting assembly can drive the support frame to move up and down to adjust the distance between the fiber optic probe and the reflector; when the fiber optic periodic measurement sensor is used as a speed measurement sensor, the plurality of reflectors cover the upper surface of the rotating shaft of the object to be measured or are evenly distributed circumferentially along the rotating shaft of the object to be measured; when the fiber optic periodic measurement sensor is used as a counting sensor, the plurality of reflectors are correspondingly arranged on a plurality of objects to be measured.

[0006] Optionally, the optical fiber period measurement sensor also includes a reflection disk. When the optical fiber period measurement sensor is used as a speed measuring sensor, the reflection disk is installed on the rotating shaft, and multiple reflectors cover the upper surface of the reflection disk or are evenly distributed on the upper surface of the reflection disk along the circumference of the reflection disk.

[0007] Optionally, a plurality of fixing grooves are provided on the reflective disk, and the plurality of reflectors are embedded in the plurality of fixing grooves in a one-to-one correspondence, wherein the plurality of fixing grooves are evenly distributed along the circumference of the reflective disk.

[0008] Optionally, the reflective disk is made of non-reflective material.

[0009] Optionally, the Y-shaped optical fiber includes a light source optical fiber and a receiving optical fiber, one end of the light source optical fiber is connected to the infrared transmitting tube, one end of the receiving optical fiber is connected to the infrared receiving tube, and the other end of the light source optical fiber and the other end of the receiving optical fiber are embedded in the optical fiber probe to form a dual-core optical fiber.

[0010] Optionally, the fiber optic probe includes a probe outer skin, a protective cover and aramid gauze, the probe outer skin is arranged on the outside of the protective cover, and the protective cover is arranged on the outside of the light source optical fiber and the receiving optical fiber, wherein one end of the light source optical fiber and the receiving optical fiber embedded in the fiber optic probe is respectively covered with aramid gauze.

[0011] Optionally, the lifting assembly includes a sleeve, a lifting rod and a fixing screw, the sleeve is sleeved on the outside of the lifting rod, the lifting rod can move along the length direction of the sleeve, and the fixing screw is used to fix the sleeve and the lifting rod.

[0012] Optionally, a chassis is provided at one end of the sleeve away from the lifting end of the lifting rod.

[0013] Optionally, a mounting through hole is provided on the support frame, and the optical fiber probe is passed through the mounting through hole.

[0014] Optionally, the support frame has a Z-shaped structure.

[0015] Compared with the prior art, the technical solution provided by the utility model has the following technical effects:

[0016] The utility model discloses an optical fiber period measurement sensor, wherein the optical fiber probe is connected to an infrared transmitting tube and an infrared receiving tube respectively through a Y-type optical fiber, so that the optical fiber probe can transmit the emission light of the infrared transmitting tube to each reflector passing thereunder and receive the reflected light of each reflector and transmit the reflected light to the infrared receiving tube to obtain a corresponding pulse signal. When the optical fiber period measurement sensor is used as a speed measuring sensor, multiple reflectors are distributed all over the upper surface of the rotating shaft of the object to be measured or are evenly distributed along the circumference of the rotating shaft of the object to be measured to obtain the number of pulse periods and the number of reflectors to calculate the rotation speed of the object to be measured.

[0017] When the fiber optic periodic measurement sensor of the present utility model is used as a counting sensor, by arranging a plurality of reflectors on a plurality of objects to be measured one by one, the number of objects to be measured is calculated by obtaining the number of pulse periods. The number and distribution of the reflectors can be flexibly set on the objects to be measured according to the detection accuracy. At the same time, the distance between the fiber optic probe and the reflector can be adjusted by the lifting component, which not only has controllable accuracy but also can be applied to various occasions.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, which will become apparent from the following description or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the fiber optic periodic measurement sensor according to the present utility model as a speed measurement sensor;

[0020] Figure 2 Schematic diagram of the circuit for converting optical signals into electrical signals according to the present utility model;

[0021] Figure 3 Schematic diagram of the structure of the fiber optic periodic measurement sensor with a reflector disc according to the present utility model;

[0022] Figure 4 Schematic diagram of the fiber optic periodic measurement sensor according to the present utility model as a counting sensor;

[0023] Figure 5 Schematic diagram of the structure of the fiber optic probe according to the present utility model;

[0024] Figure 6 Schematic diagram of the pulse obtained by converting the infrared receiving tube into an optical signal according to the present utility model.

[0025] Reference numerals in the drawings: 1, fiber optic probe; 2, reflector; 3, infrared emitter; 4, infrared receiver; 5, support frame; 6, amplifier; 7, oscilloscope; 8, motor; 9, conveyor belt; 10, bottle; 11, fixing frame; 12, reflector disc; 13, light source optical fiber; 14, receiving optical fiber; 15, probe outer skin; 16, protective sleeve; 17, aramid gauze; 18, sleeve; 19, lifting rod; 20, fixing screw; 21, chassis. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present

[0027] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present utility model means the presence of features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The phrase "and / or" used herein includes any unit and all combinations of one or more of the associated listed items.

[0028] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as herein.

[0029] The present utility model provides an optical fiber type periodic measurement sensor, which includes an optical fiber probe, a plurality of reflectors, a Y-shaped optical fiber, an infrared emitter, an infrared receiver, a support frame and a lifting assembly; the optical fiber probe is respectively connected to the infrared emitter and the infrared receiver through the Y-shaped optical fiber; the optical fiber probe is disposed above the plurality of reflectors at intervals, and the optical fiber probe can emit light to each reflector passing below it and receive the light reflected by each reflector; one end of the support frame is provided with the optical fiber probe, and the other end of the support frame is arranged at the lifting end of the lifting assembly; the lifting assembly can drive the support frame to move up and down to adjust the distance between the optical fiber probe and the reflector; when the optical fiber type periodic measurement sensor is used as a speed measurement sensor, the plurality of reflectors cover the upper surface of the rotating shaft of the object to be measured or are evenly distributed along the circumferential direction of the rotating shaft of the object to be measured; when the optical fiber type periodic measurement sensor is used as a counting sensor, the plurality of reflectors are correspondingly arranged on a plurality of objects to be measured one by one.

[0030] Among them, the optical fiber periodic measurement sensor also includes a reflective disk. When the optical fiber periodic measurement sensor is used as a speed measuring sensor, the reflective disk is installed on the rotating shaft, and multiple reflectors are distributed all over the upper surface of the reflective disk or evenly distributed on the upper surface of the reflective disk along the circumference of the reflective disk. A plurality of fixed grooves are arranged on the reflective disk, and a plurality of reflectors are embedded in the plurality of fixed grooves one by one, and the plurality of fixed grooves are evenly distributed along the circumference of the reflective disk; the reflective disk is made of non-reflective material. The Y-type optical fiber includes a light source optical fiber and a receiving optical fiber. One end of the light source optical fiber is connected to an infrared transmitting tube, and one end of the receiving optical fiber is connected to an infrared receiving tube. The other end of the light source optical fiber and the other end of the receiving optical fiber are embedded in the optical fiber probe to form a double-core optical fiber. The optical fiber probe includes a probe outer skin, a protective cover and aramid gauze. The probe outer skin is arranged on the outside of the protective cover, and the protective cover is arranged on the outside of the light source optical fiber and the receiving optical fiber, wherein one end of the light source optical fiber and the receiving optical fiber embedded in the optical fiber probe are respectively covered with aramid gauze.

[0031] In one embodiment, the lifting assembly includes a sleeve, a lifting rod and a fixing screw, the sleeve is sleeved on the outside of the lifting rod, the lifting rod can move along the length direction of the sleeve, and the fixing screw is used to fix the sleeve and the lifting rod. The end of the sleeve away from the lifting end of the lifting rod is provided with a chassis; the support frame is provided with a mounting through hole, and the optical fiber probe is inserted into the mounting through hole; the support frame is a Z-shaped structure.

[0032] To facilitate the understanding of the embodiments of the present utility model, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0033] See also Figure 1 and Figure 2As shown in the figure, an embodiment of the present utility model provides an optical fiber type periodic measurement sensor, which includes an optical fiber probe 1, a plurality of reflectors 2, a Y-shaped optical fiber, an infrared emitting tube 3, an infrared receiving tube 4, a support frame 5 and a lifting assembly; the optical fiber probe 1 is respectively connected to the infrared emitting tube 3 and the infrared receiving tube 4 through the Y-shaped optical fiber; the optical fiber probe 1 is arranged above the plurality of reflectors 2 at intervals, and the optical fiber probe 1 can emit light to each reflector 2 passing below it and receive the light reflected by each reflector 2; one end of the support frame 5 is provided with the optical fiber probe 1, and the other end of the support frame 5 is arranged at the lifting end of the lifting assembly; the lifting assembly can drive the support frame 5 to move up and down to adjust the distance between the optical fiber probe 1 and the reflector 2; when the optical fiber type periodic measurement sensor is used as a speed measurement sensor, the plurality of reflectors 2 cover the upper surface of the rotating shaft of the object to be measured or are evenly distributed along the circumference of the rotating shaft of the object to be measured; when the optical fiber type periodic measurement sensor is used as a counting sensor, the plurality of reflectors 2 are arranged on the plurality of objects to be measured in one-to-one correspondence. The reflector 2 is made of a material that reflects light, and the reflector 2 is used to reflect light. The infrared emitting tube 3 emits light as a light source, and the emitted light is transmitted to the optical fiber probe 1 through the Y-shaped optical fiber. The emitted light irradiates on the reflector 2, and the reflected light enters the optical fiber probe 1, and then is transmitted to the infrared receiving tube 4 through the Y-shaped optical fiber. The infrared receiving tube 4 is sequentially connected to an amplifier 6 and an oscilloscope 7. The infrared receiving tube 4 converts the optical signal into an electrical signal, then transmits it to the amplifier 6, and finally forms a pulse signal on the oscilloscope 7, as Figure 2 shown.

[0034] See Figure 1 shown. As a speed measurement sensor, the object to be measured is a motor 8. Adjust the lifting assembly to align the optical fiber probe 1 with one of the reflectors 2 on the rotating shaft of the motor 8 and be about 0.5 cm away from the reflector 2 until a high-level waveform is generated by the instrument. Fix the height of the lifting assembly. When the motor 8 rotates, it drives the plurality of reflectors 2 to rotate. When the optical fiber probe 1 encounters the reflector 2, the reflected light enters the Y-shaped optical fiber. The Y-shaped optical fiber transmits the reflected light to the infrared receiving tube 4. After the reflected light is received by the infrared receiving tube 4, it is converted into an electrical signal and finally displayed on the oscilloscope 7 through the amplifier 6.

[0035] See Figure 4As shown in the figure, as a counting sensor, the object to be measured is the bottle 10 on the conveyor belt 9. Two fixed brackets 11 are arranged on the conveyor belt 9, and the two fixed brackets 11 are spaced apart along the width direction of the conveyor belt 9. Each bottle 10 is arranged in sequence along the length direction of the conveyor belt 9 and is located between the two fixed brackets 11, so that the object to be measured can move back and forth, preventing the object to be measured from moving left and right, so that the optical fiber probe 1 can stably detect the quantity of the object to be measured. A reflector 2 is attached to the bottle cap of each conveyed bottle 10. The optical fiber probe 1 is arranged on one side of the conveyor belt 9 and is located on the conveying path of the bottle 10. Adjust the lifting assembly to align the optical fiber probe 1 with the reflector 2 on the bottle cap and be about 1 cm away from the reflector 2, so that the instrument generates a high-level waveform. Fix the height of the lifting assembly. The conveyor belt 9 drives the bottle 10 to move. The infrared emitting tube 3 emits light as a light source. The emitted light is transmitted to the optical fiber probe 1 through the Y-shaped optical fiber. The emitted light irradiates on the reflector 2 of each bottle cap. The reflected light is then transmitted to the infrared receiving tube 4 through the Y-shaped optical fiber. After the reflected light is received by the infrared receiving tube 4, it is converted into an electrical signal and finally displayed on the oscilloscope 7 through the amplifier 6.

[0036] See Figure 6 As shown in the figure, after the electrical signal is converted into a pulse signal, the duty cycle and pulse period of the pulse signal can be observed. This fiber optic period measurement sensor calculates the rotational speed and quantity by detecting the number of pulse periods; when it is used as a counting sensor to detect the number of objects, a reflector 2 is attached to the counted object, and the number of objects is calculated by counting the number of pulse periods. The actual number of pulse periods is the number of detected objects; when it is used as a speed measurement sensor to detect a rotating object, a reflector 2 is attached to the object rotating shaft. The number of reflectors 2 is selected according to the accuracy requirements. The reflectors 2 are evenly distributed on the rotating shaft. The rotational speed of the object can be obtained by dividing the number of pulse periods by the number of reflectors 2.

[0037] Applying the fiber optic type period measurement sensor provided in this embodiment, the fiber optic probe 1 is respectively connected to the infrared transmitting tube 3 and the infrared receiving tube 4 through the Y-shaped optical fiber, enabling the fiber optic probe 1 to transmit the emitted light of the infrared transmitting tube 3 to each reflector 2 passing below it, receive the reflected light of each reflector 2, and transmit the reflected light to the infrared receiving tube 4 to obtain corresponding pulse signals. When the fiber optic type period measurement sensor is used as a speed measurement sensor, by covering the upper surface of the rotating shaft of the object to be measured with multiple reflectors 2 or evenly distributing them circumferentially along the rotating shaft of the object to be measured, the number of pulse periods and the number of reflectors 2 are obtained to calculate the rotational speed of the object to be measured; when the fiber optic type period measurement sensor is used as a counting sensor, by correspondingly arranging multiple reflectors 2 on multiple objects to be measured, the number of objects to be measured is calculated by obtaining the number of pulse periods. The number and distribution of the reflectors 2 can be flexibly set on the object to be measured and the object to be measured according to the detection accuracy. At the same time, the distance between the fiber optic probe 1 and the reflector 2 can be adjusted through the lifting component, which is not only controllable in accuracy but also applicable to various occasions.

[0038] See Figure 3 As shown, the fiber optic type period measurement sensor of this embodiment further includes a reflection disk 12. When the fiber optic type period measurement sensor is used as a speed measurement sensor, the reflection disk 12 is installed on the rotating shaft, and multiple reflectors 2 cover the upper surface of the reflection disk 12 or are evenly distributed circumferentially on the upper surface of the reflection disk 12. The reflection disk 12 can be flexibly set on various objects to be measured, and the reflectors 2 can change the number of reflectors 2 evenly distributed on the reflection disk 12 according to the detection accuracy. The reflection disk 12 is concentrically arranged with the rotating shaft.

[0039] A plurality of fixing grooves (not shown in the figure) are provided on the reflection disk 12 of this embodiment, and multiple reflectors 2 are respectively embedded in the multiple fixing grooves, and the multiple fixing grooves are evenly distributed along the circumference of the reflection disk. See Figure 3 As shown, the object to be measured is a motor 8, the reflector 2 is embedded in the reflection disk 12, the reflection disk 12 is installed on the rotating shaft of the motor 8, the rotation of the motor 8 drives the rotation of the reflection disk 12, the fiber optic probe 1 is arranged on the rotation path of each reflector 2 and is about 0.5 cm away from the reflector 2. When the fiber optic probe 1 encounters the reflector 2, it will reflect light into the Y-shaped optical fiber, causing the instrument to generate a high-level waveform.

[0040] The reflection disk 12 of this embodiment is made of non-reflective material to avoid the reflection disk 12 reflecting light to the fiber optic probe 1 and at the same time blocking other reflected light from entering the fiber optic probe 1. The non-reflective material reflection disk 12 avoids the infrared receiving tube 4 receiving the light emitted by the infrared transmitting tube 3, thus preventing errors; that is, avoiding the receiving fiber 14 receiving the light emitted by the reflection light source optical fiber 13, thus preventing errors.

[0041] See Figure 1 andFigure 3 As shown, the Y-shaped optical fiber of this embodiment includes a light source optical fiber 13 and a receiving optical fiber 14. One end of the light source optical fiber 13 is connected to an infrared emitting tube 3, and one end of the receiving optical fiber 14 is connected to an infrared receiving tube 4. The other ends of the light source optical fiber 13 and the receiving optical fiber 14 are embedded in the optical fiber probe 1 to form a dual-core optical fiber. The light source optical fiber 13 is used to transmit the light emitted by the infrared emitting tube 3, and the receiving optical fiber 14 is used to transmit the light reflected by the reflector 2 to the infrared receiving tube 4. The light source optical fiber 13 and the receiving optical fiber 14 are arranged inside the optical fiber probe 1, which can better protect and increase the anti-interference ability. Among them, the cores of the light source optical fiber 13 and the receiving optical fiber 14 are arranged in a cable protection sleeve, reducing the light loss rate, protecting the optical fiber, and enabling it to be extended and bent arbitrarily.

[0042] See Figure 5 As shown, the optical fiber probe 1 of this embodiment includes a probe outer skin 15, a protective sleeve 16, and aramid gauze 17. The probe outer skin 15 is sleeved outside the protective sleeve 16, and the protective sleeve 16 is sleeved outside the light source optical fiber 13 and the receiving optical fiber 14. Aramid gauze 17 is sleeved on one end of the light source optical fiber 13 and the receiving optical fiber 14 embedded in the optical fiber probe 1 respectively. Specifically, the light source optical fiber 13 sleeved with aramid gauze 17 and the receiving optical fiber 14 sleeved with aramid gauze 17 are arranged side by side at intervals, and are integrally arranged inside the protective sleeve 16. The probe outer skin 15 is sleeved outside the protective sleeve 16. Through the above settings, two cores form a fan-in / fan-out dual-core optical fiber, which has better anti-interference ability than two optical fibers combined into one fiber with half the number.

[0043] See Figure 1 and Figure 3 As shown, the lifting assembly of this embodiment includes a sleeve 18, a lifting rod 19, and a fixing screw 20. The sleeve 18 is sleeved outside the lifting rod 19, and the lifting rod 19 can move along the length direction of the sleeve 18. The fixing screw 20 is used to fixedly connect the sleeve 18 and the lifting rod 19. Specifically, a threaded hole is provided on the outer wall of the sleeve 18, and the fixing screw 20 is threadedly connected to the threaded hole. By screwing the fixing screw 20, the fixing screw 20 can be moved closer to or away from the lifting rod 19. When the fixing screw 20 is screwed away from the lifting rod 19, at this time, the lifting rod 19 can move along the length direction of the sleeve 18 and drive the support frame 5 to move up and down, thereby adjusting the distance between the optical fiber probe 1 and the reflector 2; when the fixing screw 20 is screwed closer to the lifting rod 19 and abuts against the outer wall of the lifting rod, at this time, the lifting rod 19 is fixedly connected to the sleeve 18 to maintain the distance between the optical fiber probe 1 and the reflector 2.

[0044] See Figure 1 and Figure 3 As shown, a chassis 21 is provided at one end of the sleeve 18 away from the lifting end of the lifting rod 19 to ensure the stable setting of the lifting assembly.

[0045] See Figure 1 and Figure 3 As shown, an installation through hole (not shown in the figure) is provided on the support frame 5 of this embodiment, and the optical fiber probe 1 is inserted through the installation through hole so that the optical fiber probe 1 can be aligned with the reflector 2.

[0046] See Figure 1 and Figure 3 As shown, the support frame 5 of this embodiment has a Z-shaped structure. The upper end of the Z-shaped structure is connected to the lifting end of the lifting rod 19, and the lower end of the Z-shaped structure is provided with the optical fiber probe 1. The lifting rod controls the height with a minimum value. Using the Z-shaped structure can better fit the structure of the lifting rod, and thus can better approach the reflector 2; while the straight structure cannot better approach the reflector 2. In summary, a fiber optic periodic measurement sensor provided by an embodiment of the present invention uses a Y-shaped optical fiber. The structure of the Y-shaped optical fiber consists of a light source optical fiber 13 and a receiving optical fiber 14 to form one optical fiber, thereby increasing anti-interference ability, unity, etc. The reflectors 2 can be evenly distributed on the object to be measured. Among them, the light source optical fiber 13 transmits the light emitted by the infrared emitting tube 3, and the receiving optical fiber 14 is used to transmit the reflected light back to the infrared receiving tube 4. After the light reflected by the reflector 2 is received by the infrared receiving tube 4, it is converted into an electrical signal and finally displayed on the oscilloscope 7 through the amplifier 6. According to the type of the object to be measured, the calculation method is selected according to the pulse period, and the number of objects to be measured is calculated by observing the number of pulse periods or the rotation speed of the object to be measured is calculated by the number of pulse periods and the number of reflectors. The fiber optic periodic measurement sensor provided by the present invention has the advantages of strong anti-interference ability, long service life, small size, controllable precision, and many applicable occasions.

[0047] Those of ordinary skill in the art can understand that the drawings are only schematic diagrams of an embodiment, and the modules or processes in the drawings are not necessarily essential for implementing the present invention.

[0048] Those of ordinary skill in the art can understand that the components in the device in the embodiment can be distributed in the device of the embodiment according to the description of the embodiment, or can be correspondingly changed to be located in one or more devices different from this embodiment. The components of the above embodiment can be combined into one component, or can be further split into multiple sub-components.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An optical fiber period measurement sensor, characterized in that: It includes an optical fiber probe, multiple reflectors, a Y-shaped optical fiber, an infrared transmitting tube, an infrared receiving tube, a support frame and a lifting component; The optical fiber probe is connected to the infrared transmitting tube and the infrared receiving tube respectively through the Y-type optical fiber; the optical fiber probe is arranged above the multiple reflectors at intervals, and the optical fiber probe can transmit light to each reflector passing below it and receive light reflected by each reflector; the optical fiber probe is arranged at one end of the support frame, and the other end of the support frame is arranged at the lifting end of the lifting assembly; the lifting assembly can drive the support frame to move up and down to adjust the distance between the optical fiber probe and the reflector; when the optical fiber period measurement sensor is used as a speed measurement sensor, the multiple reflectors are spread all over the upper surface of the rotating shaft of the object to be measured or are evenly distributed along the circumference of the rotating shaft of the object to be measured; when the optical fiber period measurement sensor is used as a counting sensor, the multiple reflectors are arranged on the multiple objects to be measured in a one-to-one correspondence.

2. The optical fiber period measurement sensor according to claim 1, characterized in that: It also includes a reflection disk. When the optical fiber period measurement sensor is used as a speed measurement sensor, the reflection disk is installed on the rotating shaft, and multiple reflectors cover the upper surface of the reflection disk or are evenly distributed on the upper surface of the reflection disk along the circumference of the reflection disk.

3. The optical fiber period measurement sensor according to claim 2, characterized in that: A plurality of fixing grooves are arranged on the reflection plate, and a plurality of reflectors are embedded in the plurality of fixing grooves in a one-to-one correspondence, wherein the plurality of fixing grooves are evenly distributed along the circumference of the reflection plate.

4. The optical fiber period measurement sensor according to claim 2, characterized in that: The reflective disc is made of non-reflective material.

5. The optical fiber period measurement sensor according to claim 1, characterized in that: The Y-type optical fiber includes a light source optical fiber and a receiving optical fiber. One end of the light source optical fiber is connected to an infrared transmitting tube, one end of the receiving optical fiber is connected to an infrared receiving tube, and the other ends of the light source optical fiber and the other ends of the receiving optical fiber are embedded in the optical fiber probe to form a double-core optical fiber.

6. The optical fiber period measurement sensor according to claim 5, characterized in that: The optical fiber probe comprises a probe outer skin, a protective cover and aramid gauze. The probe outer skin is arranged outside the protective cover, and the protective cover is arranged outside the light source optical fiber and the receiving optical fiber. One end of the light source optical fiber and the receiving optical fiber embedded in the optical fiber probe is respectively covered with aramid gauze.

7. The optical fiber period measurement sensor according to claim 1, characterized in that: The lifting assembly comprises a sleeve, a lifting rod and a fixing screw. The sleeve is sleeved on the outside of the lifting rod. The lifting rod can move along the length direction of the sleeve. The fixing screw is used to fix the sleeve and the lifting rod.

8. The optical fiber period measurement sensor according to claim 7, characterized in that: A chassis is arranged at one end of the sleeve away from the lifting end of the lifting rod.

9. The optical fiber period measurement sensor according to claim 1, characterized in that: The support frame is provided with an installation through hole, and the optical fiber probe is passed through the installation through hole.

10. The optical fiber period measurement sensor according to claim 1, characterized in that: The support frame is in a Z-shaped structure.

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