Fibre-optical acoustic sensor

An acoustic sensor and sensor technology, applied to instruments, measuring ultrasonic/sonic/infrasonic waves, measuring devices, etc., can solve the problems of sensor sensitivity drop and measurement range reduction, and achieve the elimination of parasitic interference effects, good measurement accuracy, and low error small effect

Inactive Publication Date: 2006-08-23
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

It can overcome the above-mentioned problems in the prior art that the orthogonal working point of the sensor drifts, which causes the sensitivity of the sensor to decrease and the measurement range to decrease

Method used

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  • Fibre-optical acoustic sensor
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Embodiment Construction

[0020] see first figure 1 , figure 1 It is a structural schematic diagram of the optical fiber acoustic sensor of the present invention. As can be seen from the figure, the optical fiber acoustic sensor of the present invention is an extrinsic optical fiber Fabry-Perot acoustic sensor, comprising a light source module 1 with pigtail output, characterized in that its composition is: the light source module 1 and an optical fiber multiplexing element 2 connected to the first port 201, the third port 203 of the optical fiber light guiding element 2 is connected to the extrinsic optical fiber Fabry-Perot interference sensor head 4 through the optical fiber 3, the second port 202 of the optical fiber light guiding element 2 It is connected with the first port 501 of the optical fiber splitter 5, and the second port 502 of the optical fiber splitter 5 is connected with the tunable optical fiber bandpass filter 6, and the tunable optical fiber bandpass filter 6 is connected with the...

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Abstract

The composition of an optical fiber sound sensor is that a light source module is connected with a first port of a fiber synthetic wavelength element, the third port of said fiber light element is connected with a non-intrisic fiber Fabry-Perot interference sensor head by fibers, the second port of the light element is connected with the first port of the fiber splitter and the second port of which is connected with an adjustable fiber band-pass filter, which is connected with a first photoelectric detection unit, the third port of the splitter is connected with a second photoelectric detection unit, a driver of the filter is connected with the signal process and control unit and the first and second detection units are connected with said signal and the control units. This invention is a sound sensor with automatic stable orthogonal working points.

Description

technical field [0001] The invention relates to optical fiber sensing, in particular to an optical fiber acoustic sensor, which is an extrinsic optical fiber Fabry-Perot acoustic wave sensor. Background technique [0002] Optical fiber acoustic sensor has many advantages such as high sensitivity, strong anti-electromagnetic interference ability, good electrical insulation, safety and reliability, corrosion resistance, and can form an optical fiber sensor network. Discharge ultrasonic detection has been widely used. In terms of its technology, fiber optic acoustic sensors can be roughly divided into the following two categories: The first category is based on intrinsic optical fiber interference technology, such as all-fiber Michelson interference and Mach-Zehnder interference. The second type is based on the extrinsic Fabry-Perot interference technique. Compared with the first type of fiber-optic Michelson interference and Mach-Zehnder interference, the extrinsic Fabry-Per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 蔡海文陈高庭方祖捷
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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