Distributed optic fiber vibrating sensor

Abstract

The invention discloses a distributed optic fiber vibrating sensor which consists of a light source, a first coupler, an acoustic optic modulator, an Erbium-doped optic fiber amplifier, an optic filter, a three-port circulator, a first photoelectric detector, a second coupler, a second photoelectric detector, a high-pass filter, a frequency mixer, a function generator, a low-pass filter, a data acquisition card, a computer and a long-distance sensing optic fiber. The distributed optic fiber vibrating sensor has the beneficial technological effects of detecting the vibrating positions and the vibrating frequencies at the same time and having relatively high resolution ratio for signals.

Description

Technical field [0001] The invention involves a fiber -fiber sensing technology, especially a distributed fiber vibration sensor. Background technique [0002] The amount of vibration measurement has potential use in the field of engineering, such as structural health monitoring, aerospace, petrochemical, power system and other safety monitoring.Traditional vibration measurement methods such as mechanical measurement method and electrical measurement method. There are problems with low sensitivity, large volume, and restrictions on the measurement of amplifying devices. The traditional vibration measurement method can only be measured.Therefore, the development of a high -performance vibration measurement system is imperative. [0003] Distributed optical fiber sensing technology refers to the continuous modulation of the optical waves in the fiber in a certain way along the external signal along the optical fiber transmission path to achieve real -time measurement of the contin...

AI Technical Summary

Problems solved by technology

Optical fiber interferometric distributed sensing can detect higher vibration frequency information, but there is a problem of low vibration spatial resolution

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