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Ultra-long-distance distributed optical sensing device and method based on bidirectional optical amplification

A two-way light, distributed technology, applied in the transmission of sensing components, measuring devices, and ultrasonic/sonic/infrasonic waves using optical devices, can solve the problem of obvious backscattered light amplification effect, decreased sensing accuracy, and difficult signal transmission. Noise ratio and other issues, to achieve the effect of less external interference, increased data processing, and low light source requirements

Active Publication Date: 2018-04-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the sensing principle based on backscattering still limits the intensity of signal light in principle. At the same time, the effect of unidirectional light amplification on backscattered light is not as obvious as that of forward light. It is difficult to greatly improve the signal-to-noise ratio and is vulnerable to Due to external interference, the sensing accuracy decreases or even the positioning fails. Repeated detection and data processing are required to obtain accurate information, and the real-time performance is poor.

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  • Ultra-long-distance distributed optical sensing device and method based on bidirectional optical amplification

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Embodiment Construction

[0039] In the existing distributed optical fiber vibration sensing and positioning system, the optical signal containing vibration information is often weak in strength and low in signal-to-noise ratio. When performing long-distance sensing, the system has low accuracy and insufficient stability, and repeated measurements are difficult. It will lead to long system response time and poor real-time performance. Aiming at these technical problems, the present invention discloses an ultra-long-distance distributed optical sensing method and device based on bidirectional optical amplification. The device adds a bidirectional optical amplifier to the sensing link of the linear asymmetric Sagnac interference structure, amplifies the power of the optical signal in the sensing link, and breaks through the sensing distance of the traditional interference structure; The frequency spectrum monitors and locates the vibration sources along the line. In order to adapt the system to various s...

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Abstract

The invention provides an ultra-long-distance distributed optical sensing device based on bidirectional optical amplification, which includes a control and processing device connected in sequence, a broadband laser (1), a first fiber coupler (2), and a parallel first fiber arm (3) and the second fiber arm (4), the second fiber coupler (6), the sensor link (7) and the Faraday rotator (8), the control and processing device and the first fiber coupler (2) A photoelectric detection device (20) is also connected between them. The invention has long sensing distance, high precision and good positioning effect.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an online real-time monitoring and positioning method and a monitoring device for regional perimeter vibration signals. It is an ultra-long-distance distributed optical sensing method and device based on bidirectional optical amplification. Background technique [0002] Fully distributed optical fiber vibration sensing is a functional optical fiber sensor, which uses the sensing and conduction characteristics of optical fibers to perform real-time continuous vibration monitoring along the laid optical fiber link. It has ultra-long distance, high sensitivity, no blind area, anti-interference, and corrosion resistance. And other advantages, especially suitable for perimeter security, pipeline leakage monitoring and other occasions. [0003] Among the existing long-distance distributed optical fiber vibration sensors, the more mature ones include distributed vibration sensors ba...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00G01D5/26
Inventor 刘德明孙琪真李晓磊方骢张小龙
Owner HUAZHONG UNIV OF SCI & TECH
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