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Vibration measurement apparatus based on coreless fiber

A coreless optical fiber, vibration measurement technology, used in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of low measurement accuracy, inability to overcome temperature, etc., to improve measurement accuracy, increase measurement sensitivity and system. The effect of speed of response

Inactive Publication Date: 2016-12-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a vibration measurement device based on a coreless optical fiber, aiming to solve the problem of low measurement accuracy caused by the inability to overcome the influence of temperature on vibration measurement in the prior art

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The invention proposes a vibration measurement device based on a coreless optical fiber, which can overcome the influence of temperature on vibration measurement and improve measurement accuracy. In particular, it relates to a fiber laser system based on coreless fiber filtering to realize effective measurement of vibration.

[0020] The invention uses the coreless optical fiber as the main sensing structure, and realizes the effective measurement of the vibration frequency through the interference filtering of the pumping laser light and the corresponding demodulation device. The sensing s...

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Abstract

The invention discloses a vibration measurement device based on a coreless optical fiber, which includes a data acquisition module, a photoelectric detector, a coupler, an erbium-doped optical fiber, a wavelength division multiplexer, a light source, an isolator and a coreless optical fiber sensing structure; The first end of the multiplexer is connected to the light source, the second end of the wavelength division multiplexer is connected to one end of the erbium-doped fiber, the other end of the erbium-doped fiber is connected to the first end of the coupler, and the second end of the coupler is connected to One end of the coreless fiber sensing structure, the other end of the coreless fiber sensing structure is connected to one end of the isolator, the other end of the isolator is connected to the third end of the wavelength division multiplexer, and the third end of the coupler is connected to The input end of the photodetector, the input end of the data acquisition module is connected to the output end of the photodetector. The invention can overcome the influence of temperature on the vibration measurement and improve the measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to a vibration measurement device based on a coreless optical fiber. Background technique [0002] With the continuous development of fiber optic sensing technology in recent decades, fiber optic sensing technology has been widely used in various fields, especially in power systems, buildings, communications and other fields. With the development of society and economy and the introduction of the concept of smart grid, the power system has higher and higher requirements for real-time monitoring of the structural health of related facilities, such as online monitoring of parameters such as transformer vibration and temperature. The sensing method has no way to meet the actual needs. As a high-quality optical transmission medium, when it is applied in the field of sensing, it can highlight many advantages compared with traditional sensors, such as high m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 夏历叶阳刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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