An Interferometric Distributed Optical Fiber Vibration Sensor

Abstract

The invention discloses an interference-type distributed optical fiber vibration sensor. The optical fiber vibration sensor includes a first Signac interferometer, a second Signac interferometer, a light source emitting device and a signal processing device. The first Signac interferometer The interferometer and the second Signac interferometer are respectively connected to the signal processing device; the first Signac interferometer and the second Signac interferometer include sensing optical fibers, and the light source emitting device emits vibrations at a preset angle. The first polarized light and the second polarized light, the first polarized light and the second polarized light are respectively incident into the first Signac interferometer and the second Signac interferometer, and due to the first Signac The sensing fiber in the interferometer and the second Signac interferometer is affected by the disturbance point and undergoes a phase change, and the phase-changed first polarized light and second polarized light are transmitted to the signal processing device, and the signal processing device is used for Based on the phase-changed first polarized light and the second polarized light, the disturbance point is located.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, and more specifically relates to an interference type distributed optical fiber vibration sensor. Background technique [0002] The interferometric distributed interference sensor can monitor any disturbance point on the sensing fiber, obtain the time domain waveform of the disturbance point, judge according to the nature of the disturbance event and give an alarm message, and also give the spatial position information of the disturbance point. [0003] The existing interferometric distributed interferometric sensors mainly take Mach-Zehnder (M-Z) interferometric structures, Sagnac interferometric structures and their composite structures as main forms. The M-Z interference structure has problems such as coherent noise and polarization fading, and has the disadvantage of poor anti-environmental interference; the Sagnac interference structure needs to use signal spectrum characteristics to...

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Problems solved by technology

The M-Z interference structure has problems such as coherent noise and polarization fading, and has the disadvantage of poor anti-environmental interference; the Sagnac interference structure needs to use signal spectrum characteristics to achieve positioning, and the positioning result depends on the frequency characteristics of the external vibration signal, which has the disadvantage of unstable positioning results. Disadvantages: The composite interference structure of the two is not only complex in structure, but also requires complex processing such as signal synchronization during operation

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