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Single-end optical fiber ring reflection type vibration and sonic sensor

An acoustic wave sensor, fiber optic coil technology, used in dynamic strain, acoustic wave sensor, vibration field

Inactive Publication Date: 2009-07-01
SHANDONG MICRO PHOTOGRAPHIC ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a kind of single-ended optical fiber loop reflective vibration and acoustic wave sensor aiming at the deficiencies in the prior art. It needs to solve the problem that the melting double cone over-coupling optical fiber vibration and acoustic wave sensor must use three optical fibers to transmit light waves. Provide a vibration and acoustic wave sensor with only one optical fiber input and output, easy to install, low cost, and high sensitivity

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  • Single-end optical fiber ring reflection type vibration and sonic sensor
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  • Single-end optical fiber ring reflection type vibration and sonic sensor

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Embodiment Construction

[0024] like figure 1 As shown, the working principle of the present invention is as figure 1 As shown, it consists of a F-P cavity semiconductor laser 1, a 3dB coupler 2, an optical fiber loop reflector 3, detectors 4 and 5, a signal processing circuit 6, and a filter 7. The output spectrum of F-Per cavity laser 1 is as follows figure 2 As shown in the light, it enters the 3dB coupler 2 and splits into two, one beam enters the detector 5 as a reference to eliminate the drift of the light source power, and the other beam enters the optical fiber circle reflector 3, and is reflected by the optical fiber circle reflector along the original The optical path returns, and the returned optical signal is coupled to the detector 4 through the coupler 2 again, and the detectors 4 and 5 convert the received light intensity into a voltage V 1 and V 2 , the signal processing circuit 6 performs Operation, in order to eliminate the error caused by the drift of the light source, the det...

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Abstract

A single-ended optical fiber loop reflection type vibration and sound wave sensor, which uses only one optical fiber for input and output, easy to install, low cost, and high sensitivity vibration and sound wave sensor. It includes a light source, an optical fiber loop reflector and a coupler connecting the light source and the optical fiber loop reflector, and a demodulation circuit connected to the coupler, wherein the optical fiber loop reflector includes two optical fibers fused together in the middle, The output ends of two optical fibers are fused to form a fiber optic loop reflector. The invention is mainly used for vibration and acoustic wave sensors.

Description

technical field [0001] The invention relates to a dynamic strain, vibration and sound wave sensor, in particular to an optical fiber loop reflection vibration and sound wave sensor based on the melting double cone over-coupling technology. Background technique [0002] Vibration sensors are being widely used in various sectors of the national economy. However, electronic-based vibration sensors are bulky, susceptible to electromagnetic interference, and sensing components have current and voltage, which greatly limits their application range, such as large electromechanical equipment Strong electromagnetic fields and places with flammable and explosive gases will be generated during work. Therefore, optical fiber vibration sensors with small size, strong anti-electromagnetic interference ability, easy multi-point multiplexing, and no need for charged sensing elements are becoming research hotspots. The currently reported optical fiber vibration sensors generally include inte...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 常军刘统玉马良柱王黔王红春倪家升
Owner SHANDONG MICRO PHOTOGRAPHIC ELECTRONICS