Optical fiber hydrophone based on built-in micro-nanofiber full-optical carrier modulator probe

Abstract

The present invention relates to an optical fiber sensing technology, in particular to an optical fiber hydrophone based on a built-in micro-nanofiber full-optical carrier modulator probe. The optical fiber hydrophone is composed of an optical fiber coupler, a first Faraday rotating mirror, a second Faraday rotating mirror, a micro-nanofiber full-optical phase modulator, a modulator protection casing pipe, a first modulator protection casing pipe cap, a second modulator protection casing pipe cap, a probe sensing inner cylinder support, a probe sensing outer cylinder support, a probe protection casing pipe, a first probe protection casing pipe cap, a second probe protection casing pipe cap, a sensing optical fiber and a transmission optical fiber. The optical fiber hydrophone of the present invention adopts the micro-nanofiber full-optical phase modulator to generate a phase carrier, by being compared with a light source modulation phase generation carrier technology, the outstanding advantages of the optical fiber hydrophone are that a signal light source does not need the frequency modulation any more, but a whole sensing system shows more excellent frequency stability or phase stability, at the same time, a sensing interferometer used by the optical fiber hydrophone is quasi equilibrium, thereby being helpful to eliminate the phase noise of the optical fiber hydrophone caused by the outside world.

Description

Technical field [0001] The invention relates to an optical fiber sensing technology, in particular to an optical fiber hydrophone based on a micro-nano optical fiber all-optical carrier modulator probe built-in. Background technique [0002] Fiber-optic hydrophones have the advantages of high sensitivity, anti-electromagnetic interference, and large-scale integrated multiplexing. It has been widely used in petroleum exploration, marine fishery, anti-submarine applications and underwater acoustic physics research, and has become a modern fiber-optic sensor The important research and development direction of technology and underwater acoustic detection technology. The basic working principle of the optical fiber hydrophone is to effectively modulate the phase parameter and wavelength parameter of the light wave transmitted in the sensing fiber by combining the sensor probe with a specific mechanical structure, and then use the corresponding signal processing technology to demodulat...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to design a fiber optic hydrophone based on a micro-nano optical fiber all-optical carrier modulator probe, which adopts a push-pull dual-axis winding probe structure, and realizes the external phase modulation of the interferometer. The built-in carrier all-optical modulator probe overcomes the shortcomings of the existing technology, making the fiber optic hydrophone system improve in terms of phase noise characteristics, stability, sensing sensitivity, and large-scale integration performance.

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