A bamboo fiber laser hydrophone packaging structure and assembling method thereof

Abstract

The invention discloses a packaging structure of a bamboo-shaped fiber laser hydrophone, an assembly method thereof, and a processing method of a bamboo-shaped elastic cylinder; wherein, the packaging structure includes: a pair of end covers, a pair of Elastic diaphragm, bamboo-shaped elastic tube and active optical fiber; the outer surface of the bamboo-shaped elastic tube is provided with multiple circular grooves; the inside of the bamboo-shaped elastic tube is filled with silicone oil; a pair of elastic diaphragms are respectively glued on Both ends of the bamboo-shaped elastic tube; a pair of end caps are respectively arranged on both ends of the bamboo-shaped elastic tube; an air cavity structure is formed between the end cap and the elastic diaphragm; the active optical fiber is located on the central axis of the bamboo-shaped elastic tube The two ends of the active optical fiber pass through the pair of end caps respectively. The packaging structure of the bamboo-shaped fiber laser hydrophone described in the present invention ensures that the fiber laser hydrophone has a flat frequency response and high sensitivity in the low frequency band while satisfying the need to reduce the size.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a bamboo-shaped optical fiber laser hydrophone packaging structure and an assembly method thereof, and a processing method of a bamboo-shaped elastic cylinder. Background technique [0002] The fiber laser hydrophone relies on the "active" fiber grating technology, uses the "active" fiber grating as a sensitive element, writes a fiber Bragg grating with a certain phase shift on the erbium-doped or erbium-ytterbium co-doped fiber to form a distributed feedback fiber laser . The underwater acoustic signal is obtained by detecting the phase shift change caused by the external sound pressure acting on the laser resonator cavity. Since the distributed feedback fiber laser directly etches the grating on the optical fiber, and its diameter is the diameter of the optical fiber, the fiber laser hydrophone obtained after packaging it not only has the advantages o...

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Problems solved by technology

However, in the course of the fiber laser hydrophone test, it was found that although the fiber laser hydrophone with the packaging structure of the cylindrical support tube with axisymmetric structure can realize the receiving test of the underwater acoustic signal, when the diameter of the hydrophone When the working frequency band decreases, its low-frequency response flatness and sensitivity decrease, especially when the frequency band drops below 200Hz, the hydrophone has resonance at multiple frequency points, which seriously affects the performance of the fiber laser hydrophone. Low frequency response characteristics, which in turn affect the use

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