Distributed optical fiber vibration sensor based on relay amplifying and sensing technology and method thereof

Abstract

The invention discloses a distributed optical fiber vibration sensor based on the relay amplifying and sensing technology and a method thereof, belonging to the technical field of optical fiber vibration sensing. The system comprises a light source, an electro-optical modulator, a pulse driver, a light amplifier, a circulator, a polarizing beam splitter, a collector and a signal analysis processing system. The sensor is characterized in that the system also comprises a pumping laser light source and an optical remote sensing relay amplifying and sensing optical module. The pumping laser light source is arranged in the distributed optical fiber vibration sensing demodulation device and the optical remote sensing relay amplifying and sensing optical module is embedded between multistage sensing fibers. The passive optical modules of the pumping laser light source and optical remote sensing relay amplifying and sensing optical module perform long-distance connection through transmission fiber to form the light amplifier, the gain of the optical remote sensing relay amplifying and sensing optical module is utilized to overcome fibre loss, increase the intensity of the spontaneous Rayleigh scattering light of the optical fibre, enhance the signal-to-noise ratio of the distributed optical fiber vibration sensing system, enlarge the transmission distance of the system and increase the measurement accuracy of vibration events in the target area. The system is mainly used in the fields requiring long-distance measurement vibration signals such as perimeter safety precaution, border precaution, seismic detection and tsunami early warning.

Description

technical field [0001] The invention relates to the field of distributed optical fiber vibration sensing, in particular to a distributed optical fiber vibration sensor based on relay amplification sensing technology. The invention also relates to a vibration sensing method of a distributed optical fiber vibration sensor based on relay amplification sensing technology. Background technique [0002] Sensing and alarming systems such as perimeter security, border protection, earthquake detection, and tsunami early warning play a huge role in ensuring the stability of people's lives and protecting the safety of people's lives and property, and the essence of such signals is the detection and analysis of vibration signals. With the development of optical devices and optical communication technology, more and more optical fiber sensing technology is used in the field of sensing, gradually replacing some traditional electrical sensors. [0003] At present, distributed optical fibe...

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Problems solved by technology

[0005] In order to solve the problem that the existing distributed optical fiber vibration sensing device cannot achieve accurate positioning during ultra-long-distance measurement, the present invention provides a distributed optical fiber vibration sensor based on relay amplification sensing technology

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