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Large dynamic optical fiber vibration sensor

A fiber optic vibration and sensor technology, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problem of insufficient dynamic range of vibration sensor detection, achieve the effect of expanding dynamic range, realizing miniaturization, and high integration

Active Publication Date: 2012-03-14
NAT UNIV OF DEFENSE TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problem of insufficient detection dynamic range of existing vibration sensors, the present invention provides a vibration sensor that can expand the dynamic range, detect large signals without distortion, and ensure high detection sensitivity to detect small signals. A large dynamic fiber optic vibration sensor

Method used

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Embodiment Construction

[0021] see figure 1 , the high-sensitivity interferometer, the low-sensitivity interferometer, the mass 11 , the first elastic cylinder 18 , the second elastic cylinder 19 , and the support base 21 of this embodiment are all packaged in the housing 20 .

[0022] The high-sensitivity interferometer includes a second coupler 5, the first sensing arm fiber 7, the second sensing arm fiber 8, the first reflection end 9, and the second reflection end 10; the low-sensitivity interferometer includes a third fiber coupler 6 , the third sensing arm optical fiber 12 , the reference arm optical fiber 13 , the third reflection end 14 , and the fourth reflection end 15 .

[0023] The shell 20 is a stainless steel cylindrical part, and the inner walls of the opposite sides of the shell are respectively provided with a first cylindrical groove 201 and a second cylindrical groove 203, and the first support base 21 is butted and bonded to the first cylindrical groove 201 Inside, the second sup...

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Abstract

The invention discloses a large dynamic optical fiber vibration sensor comprising a light source, a first optical fiber coupler, a high-sensitivity interferometer, a low-sensitivity interferometer and two optical detectors. The two arms of the high-sensitivity interferometer have same length and are wound on elastic cylinders at two ends of a mass block respectively, so that a symmetric push-pullstructure is formed and used for detecting a small signal; one arm of the low-sensitivity interferometer is wound on the two elastic cylinders after passing through the mass block; the lengths of theoptical fibers wound on the two elastic cylinders are different; and the other arm of the low-sensitivity interferometer is vacant and used for detecting a large signal. According to the large dynamic optical fiber vibration sensor disclosed by the invention, the dynamic range of an interference-type optical fiber vibration sensor is enlarged, simultaneous and large dynamic detection of a common point of the optical fiber vibration sensor is realized, and the vibration sensor is easy to miniaturize.

Description

technical field [0001] The invention relates to a vibration sensor used in the field of vibration sensing, in particular to a large dynamic optical fiber vibration sensor. Background technique [0002] Vibration sensors are widely used in geological exploration and energy development, earthquake detection and tsunami warning, safety monitoring of equipment and building structures and other fields. Among them, the interferometric optical fiber vibration sensor is favored because of its high sensitivity, suitable for detecting dynamic signals, anti-electromagnetic interference, strong survivability in harsh environments such as high temperature, humidity and chemical corrosion, and easy reuse to form a large-scale array. . [0003] The interferometric optical fiber vibration sensor is constructed based on the principle of interferometer. Specifically, a mass block is connected to the sensing fiber. The external vibration causes the vibration of the mass block to change the te...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 孟洲张楠熊水东饶伟姚琼胡正良罗洪陈伟倪明涂晓波
Owner NAT UNIV OF DEFENSE TECH
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