Shock isolation and sound isolation package structure of fiber optic interferometer

Abstract

The invention discloses a shock isolation and sound isolation package structure of a fiber optic interferometer. The shock isolation and sound isolation package structure comprises a lower structure, a middle structure, an upper structure and a sound isolation device, wherein the middle structure is circular and is fixedly arranged on the lower structure; the upper structure is fixedly arranged on the middle structure and comprises an upper fixed flat plate and four elastic bands; four stand columns are uniformly assembled on the upper fixed flat plate; a fixed pulley is assembled on one side of the upper end of each stand column; one ends of the four elastic bands are fixed with the upper fixed flat plate; the four elastic bands are bridged over the fixed pulleys on the stand columns respectively; and the sound isolation device is suspended at the other ends of the four elastic bands on the upper structure. The shock isolation level is gradually changed from vibration frequency of 1 Hz to 1KHz, the shock isolation effect is not less than 20 dB, and the sound isolation level is from 10 Hz to 1 KHz, so that the sound isolation effect of not less than 40 dB is realized, thereby meeting the working requirement under severe environments.

Description

technical field [0001] The invention relates to the field of optical fiber technology in the optical industry, in particular to a sound- and shock-isolation packaging structure for an optical fiber interferometer. Background technique [0002] In the optical fiber sensing system, the optical fiber interferometer is a key device, its function is to convert the wavelength change of the optical fiber sensor into the corresponding phase change, and at the same time play the role of signal amplification, which has an important impact on the demodulation system. The fiber optic interferometer is easily affected by the external environment. Changes in the sound and vibration in the external environment will cause the phase difference between the two arms of the interferometer to change, thereby affecting the background noise level of the entire sensing system and reducing the system resolution. The situation is serious. It will cause the system to malfunction and not work normally,...

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Problems solved by technology

[0003] With the development of optical fiber sensing technology, optical fiber sensing technology has been applied to many fields, including some industries with harsh test environments such as petroleum, marine and aerospace, which requires the packaging structure of optical fiber interferometer to have excellent sound insulation Seismic isolation capability, however, the performance indicators of existing products of this type are far from the requirements of the application

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