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Interference-type optical fiber pick-up probe

An interference type, optical fiber technology, applied in the direction of microphone port/microphone accessories, etc., can solve the problems of poor low frequency response, poor stability and complex structure of fiber optic microphones, and achieve the effect of high sensitivity, high stability and simple driving circuit.

Active Publication Date: 2010-11-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of fiber optic microphone has poor low frequency response and is usually used for ultrasonic detection, and its stability is poor
[0003] Usually, the fiber optic microphone array composed of wavelength division multiplexing technology needs to use multiple light sources and multiple light receiving circuits, which is costly and complex in structure.

Method used

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  • Interference-type optical fiber pick-up probe

Examples

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Embodiment Construction

[0012] The interference type pickup probe proposed by the present invention is composed of an optical fiber 11 whose end face is concave and coated with a reflective film, an annular ceramic fixture 12, a vibrating reflective film 13, a metal sound-transmitting mesh cover 14, and a metal shell 15; wherein the annular ceramic fixture The inner wall of 12 is fixedly connected with the cladding of optical fiber 11, the outer wall of annular ceramic fixture 12 is fixed on the inner side of metal shell 15, the outer wall of vibrating reflection film 13, the outer wall of metal sound-transmitting net cover 14 are also fixed on the inner side of metal shell 15; The contacting end surface of the vibrating reflection film 13 is concave to match the contact area of ​​the vibrating reflection film 13 , and the contact area between light and the vibrating reflection film 13 is enlarged. Radius R of the arc surface where the vibrating reflective film 13 is in contact with the optical fiber ...

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Abstract

The invention discloses an interference-type optical fiber pick-up probe relating to a distributed interference-type optical fiber pick-up probe based on space division multiplexing. The pick-up probe comprises an optical fiber (11), an annular ceramic clamp (12), a vibration reflecting film (13), a metal sound transmission mesh screen (14) and a metal housing (15), wherein an inner wall of the annular ceramic clamp (12) is fixedly connected with a cladding of the optical fiber (11), an outer wall of the annular ceramic clamp (12) is fixed inside the metal housing (15), and an outer wall of the vibration reflecting film (13) and an outer wall of the metal sound transmission mesh screen (14) are also fixed inside the metal housing (15); and an end surface where the optical fiber (11) is incontact with the vibration reflecting film (13) is concave and matched with the contact area of the vibration reflecting film (13) to enlarge the contact area of the light and the vibration reflecting film (13).

Description

technical field [0001] The invention relates to a distributed interference optical fiber pickup probe based on space division multiplexing, and belongs to the technical field of optical fiber sensing and sensing networks. Background technique [0002] Traditional electric microphones are susceptible to electromagnetic interference, and the sensing components have current and voltage, which seriously limit their application range, such as large-scale electromechanical equipment places (power plants) that generate strong electromagnetic fields during work, storing flammable, Warehouses with explosive gases, and MRI test rooms in hospitals, etc. Due to its anti-electromagnetic interference, small size, light weight, and easy construction of a sensor network to achieve multi-point measurement, the fiber optic microphone is becoming a research hotspot. Fiber optic microphones can be divided into three categories according to their working principles: intensity modulation type, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/08
Inventor 孙小菡潘超秦川柏宁丰樊鹤红
Owner SOUTHEAST UNIV
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