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CN-224231081-U - Optical fiber vibration sensor

CN224231081UCN 224231081 UCN224231081 UCN 224231081UCN-224231081-U

Abstract

The utility model discloses an optical fiber vibration sensor, which aims to solve the problems of low sensitivity, poor stability, easiness in temperature and electromagnetic interference in the existing vibration detection. The optical fiber vibration sensor comprises a shell and a vibration sensing mechanism, wherein the vibration sensing mechanism is arranged in the shell and comprises a fixed seat, a vibrating piece, a mirror plate and optical fibers, the vibrating piece is connected with the fixed seat, a first cavity is formed between the fixed seat and the vibrating piece, the mirror plate is fixedly connected with the vibrating piece, the mirror plate is positioned in the first cavity, the optical fibers penetrate through the fixed seat, the end faces of the optical fibers are positioned in the first cavity, the end faces of the optical fibers are opposite to the mirror plate, and the end faces of the optical fibers and the mirror plate form a Fabry-Perot cavity. And a vibration sensing mechanism is arranged in the shell, a Fabry-Perot cavity is formed through a mirror surface piece and an optical fiber end face on the vibration piece, and the distance change of the Fabry-Perot cavity is accurately monitored through an optical fiber in the vibration process, so that the vibration condition of equipment is acquired.

Inventors

  • HE LI
  • ZHONG WEIPING
  • XIE WENTAO

Assignees

  • 深圳阿珂法先进科技有限公司

Dates

Publication Date
20260512
Application Date
20250627

Claims (10)

  1. 1. An optical fiber (24) vibration sensor is characterized in that the optical fiber (24) vibration sensor comprises a shell (1) and a vibration sensing mechanism (2), wherein the vibration sensing mechanism (2) is arranged in the shell (1); Vibration perception mechanism (2) include fixing base (21), trembler (22), mirror plate (23) and optic fibre (24), trembler (22) with fixing base (21) are connected, fixing base (21) with form first cavity (21 a) between trembler (22), mirror plate (23) with trembler (22) fixed connection, mirror plate (23) are located in first cavity (21 a), optic fibre (24) pass fixing base (21), optic fibre (24) terminal surface is located in first cavity (21 a), optic fibre (24) terminal surface just right mirror plate (23), optic fibre (24) terminal surface with mirror plate (23) form the Fabry-Perot cavity.
  2. 2. The optical fiber (24) vibration sensor according to claim 1, wherein the vibrating piece (22) includes a connecting portion (221) and a vibrating portion (222), the connecting portion (221) is located on a peripheral side of the vibrating portion (222), the connecting portion (221) is connected with the fixing base (21), and the vibrating portion (222) is connected with the mirror plate (23).
  3. 3. The optical fiber (24) vibration sensor according to claim 2, wherein the housing (1) comprises a first housing (11) and a second housing (12), the first housing (11) being connected to the connection portion (221), the first housing (11) being connected to the fixing base (21), the second housing (12) being connected to the fixing base (21).
  4. 4. An optical fiber (24) vibration sensor according to claim 3, characterized in that the inner wall of the first housing (11) is provided with a first boss (111), the first boss (111) is connected with the connecting portion (221), and a second chamber (11 a) is formed between the vibrating piece (22) and the first housing (11).
  5. 5. The optical fiber (24) vibration sensor according to claim 4, wherein a second boss (121) is provided on an inner wall of the second housing (12), the second boss (121) is connected to the fixing base (21), a third chamber (12 a) is formed between the fixing base (21) and the second housing (12), and the optical fiber (24) enters the first chamber (21 a) along the third chamber (12 a).
  6. 6. The optical fiber (24) vibration sensor according to claim 5, wherein the optical fiber (24) vibration sensor further comprises a ferrule assembly (3), the optical fiber (24) passes through the ferrule assembly (3), the ferrule assembly (3) comprises a ferrule (31) and a ferrule base (32), the ferrule (31) is fixedly connected with the ferrule base (32), the ferrule (31) passes through the fixing base (21), the ferrule base (32) is located in the third chamber (12 a), and the ferrule base (32) is abutted with the fixing base (21).
  7. 7. The optical fiber (24) vibration sensor according to claim 6, wherein the optical fiber (24) vibration sensor further comprises a locking assembly (4), the locking assembly (4) is sleeved on the optical fiber (24), a mounting hole (12 b) is formed in the second housing (12), and the locking assembly (4) is connected with the mounting hole (12 b).
  8. 8. The optical fiber (24) vibration sensor according to claim 7, wherein a first protection part (5) is arranged between the optical fiber (24) and the locking assembly (4), the locking assembly (4) comprises a locking part (41), the locking part (41) is sleeved on the first protection part (5), and the locking part (41) is connected with the mounting hole (12 b).
  9. 9. The optical fiber (24) vibration sensor according to claim 8, wherein the optical fiber (24) vibration sensor further comprises a second protection portion (6), the locking assembly (4) further comprises a clamping portion (42), the clamping portion (42) and the locking portion (41) are integrally formed, the second protection portion (6) is sleeved on the clamping portion (42), and one end of the second protection portion (6) is abutted to the locking portion (41).
  10. 10. The optical fiber (24) vibration sensor according to claim 1, wherein the optical fiber (24) vibration sensor further comprises a mass plate (7), the mass plate (7) is fixedly connected with the vibration plate (22), the mass plate (7) is located on one surface of the vibration plate (22), and the mirror plate (23) is located on the other surface of the vibration plate (22).

Description

Optical fiber vibration sensor Technical Field The utility model relates to the technical field of optical fiber sensing, in particular to an optical fiber vibration sensor. Background During operation of the electrical equipment, the mechanical vibration state of key components (such as transformer windings, breaker mechanisms, GIS housings, etc.) is an important indicator reflecting the health of the equipment. Abnormal vibration may be caused by factors such as insulation degradation, mechanical loosening, abrupt load change and the like, and if the abnormal vibration is not detected in time, equipment failure and even safety accidents may be caused. Therefore, real-time and accurate vibration monitoring has important significance in guaranteeing the reliability and service life management of the power system. Currently, vibration detection of electrical equipment mainly depends on piezoelectric acceleration sensors, capacitive sensors and MEMS (micro electro mechanical systems) accelerometers. However, the sensors have certain limitations in power scenes, such as piezoelectric sensors rely on charge signal output, are required to be matched with charge amplifiers, are easy to be subjected to electromagnetic interference, have insufficient sensitivity under low-frequency vibration (< 5 Hz) and are difficult to capture common slowly-changing vibration characteristics in power equipment, capacitive sensors are sensitive to mounting surface flatness and environment humiture and poor in long-term stability, are difficult to adapt to complex working conditions in the power equipment, and MEMS accelerometers are small in size, but have limited high-temperature resistance (usually <125 ℃) of semiconductor materials, and are easy to drift or fail under the environment of local overheating or strong electromagnetic fields of the equipment. In addition, the sensors all need metal wires to transmit signals, so that the risk of electromagnetic interference is introduced, and the sensors are difficult to safely deploy in a high-voltage insulation area. Disclosure of utility model The utility model aims to provide an optical fiber vibration sensor, which aims to solve the problems of low sensitivity, poor stability, easiness in temperature and electromagnetic interference in the existing vibration detection. In order to solve the problems, the utility model provides an optical fiber vibration sensor, which comprises a shell and a vibration sensing mechanism, wherein the vibration sensing mechanism is arranged in the shell; The vibration sensing mechanism comprises a fixing seat, a vibration piece, a mirror plate and an optical fiber, wherein the vibration piece is connected with the fixing seat, a first cavity is formed between the fixing seat and the vibration piece, the mirror plate is fixedly connected with the vibration piece, the mirror plate is positioned in the first cavity, the optical fiber passes through the fixing seat, the end face of the optical fiber is positioned in the first cavity, the end face of the optical fiber is opposite to the mirror plate, and the end face of the optical fiber and the mirror plate form a Fabry-Perot cavity. Preferably, the vibration plate includes a connecting portion and a vibrating portion, the connecting portion is located on a peripheral side of the vibrating portion, the connecting portion is connected with the fixing base, and the vibrating portion is connected with the mirror plate. Preferably, the shell comprises a first shell and a second shell, the first shell is connected with the connecting part, the first shell is connected with the fixing seat, and the second shell is connected with the fixing seat. Preferably, a first boss is provided on the inner wall of the first housing, the first boss is connected to the connecting portion, and a second chamber is formed between the vibrating piece and the first housing. Preferably, the inner wall of the second housing is provided with a second boss, the second boss is connected with the fixing seat, a third chamber is formed between the fixing seat and the second housing, and the optical fiber enters the first chamber along the third chamber. Preferably, the optical fiber vibration sensor further comprises a core insert assembly, the optical fiber penetrates through the core insert assembly, the core insert assembly comprises a core insert and a core insert base, the core insert is fixedly connected with the core insert base, the core insert penetrates through the fixing base, the core insert base is located in the third cavity, and the core insert base is in butt joint with the fixing base. Preferably, the optical fiber vibration sensor further comprises a locking assembly, the locking assembly is sleeved on the optical fiber, a mounting hole is formed in the second shell, and the locking assembly is connected with the mounting hole. Preferably, a first protection part is arranged between the optical fiber and the locking