A time-delay optical fiber and reference optical fiber packaging structure for optical fiber hydrophone modulation system

Abstract

The invention discloses a time-delay optical fiber and reference optical fiber encapsulation structure for an optical fiber hydrophone modulation system. The sound absorption coefficient of the sound insulation and thermal insulation filling structure of the time-delay optical fiber and reference optical fiber encapsulation structure of the invention is not smaller than 0.75; the internal noise of the encapsulation structure which has been subjected to sound insulation is not larger than 25dB; and the disturbance of external sound signals and temperature can be effectively insulated. According to the time-delay optical fiber and reference optical fiber encapsulation structure of the invention, SE series damping silicone rubber is adopted to make vibration isolation gaskets; a four-point support arrangement mode is adopted; and with the vibration isolation structures adopted, vibration above 20HZ transferred to an inner-layer mounting bottom plate from a middle-layer mounting bottom plate can be blocked, and vibration decrease efficiency is greater than 85%, and adverse effects on an optical path caused by external vibration can be effectively eliminated.

Description

technical field [0001] The invention relates to a time-delay optical fiber and a reference optical fiber packaging structure used in an optical fiber hydrophone modulation system, and belongs to the field of optical fiber hydrophone modulation systems. Background technique [0002] Optical fiber hydrophone is a new type of aquatic signal detection sensor based on optical fiber sensing technology. Its principle is to use sound waves to modulate the intensity, polarization, phase and other parameters of light waves to obtain information such as frequency and intensity of sound waves. The advantage of the optical fiber hydrophone is that the buried communication optical cable can be used as a sensing medium and a data communication medium at the same time, and no power supply is required throughout the process. It has significant advantages over traditional piezoelectric hydrophones in terms of sensitivity, frequency band, and anti-electromagnetic interference. In recent years...

AI Technical Summary

Problems solved by technology

Because the same type of polarization-maintaining fiber is used for the reference optical fiber, the delay optical fiber and the sensitive optical fiber, all the optical fibers are sensitive to the sound pressure signal, but there is no need for the reference optical fiber and the delayed optical fiber to respond to the sound pressure signal; at the same time, because The thermal expansion of the material and the optical fiber have high requirements on the working temperature. The change of the light environment temperature will cause the change of the corresponding performance of the optical fiber, and will also greatly affect the working accuracy of the system. In addition, the optical fiber hydrophone modulation system in the complex working environment, will Affected by vibration, it affects the normal working state of the optical fiber and the quality of optical signal transmission

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