Fiber grating based interference type three-dimensional vector hydrophone

Abstract

The invention discloses a fiber grating based interference type three-dimensional vector hydrophone. The vector hydrophone comprises a sealed shell used for mounting and protecting fiber grating based one-dimensional accelerometers which are inside the sealed shell and are used for measuring vibration accelerations in X, Y and Z directions, wherein the sealed shell is made of a low-density material and can meet a zero-buoyancy balance weight requirement; an elastic shell mounted outside the sealed shell and a fiber grating based fiber interferometer stuck on the elastic shell compose a sound pressure measurement channel which is used for measuring a sound pressure in water; each fiber grating based one-dimensional accelerometer has the same structure as the fiber interferometer of the sound pressure measurement channel and is respectively composed of two gratings and sensing fibers between the two gratings; the two gratings respectively reflect partial incident light signals; a hole in the sealed shell is used for leading out tail fibers of each fiber grating based one-dimensional accelerometer in the sealed shell. The fiber grating based interference type three-dimensional vector hydrophone has no discrete device, is good for size miniaturization and has obvious advantages in the aspects of reliability, multiplexing technology and the like.

Description

technical field

[0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to a vector hydrophone based on optical fiber gratings. Background technique

[0002] Vector hydrophones can be used to measure signal vector fields in water such as sound pressure gradient, particle velocity, and particle acceleration, and can obtain more information than sound pressure hydrophones. The array formed by the vector hydrophone has high gain, which can effectively reduce the size of the low-frequency array. Vector hydrophones are widely used in ocean acoustic measurement, sonobuoy, underwater acoustic communication and other fields.

[0003] The optical fiber vector hydrophone composed of the combination of optical fiber sensing technology and vector hydrophone technology uses optical fiber as the sensitive element, integrates optical discrete devices such as light splitting and reflection that form the optical path, and uses the external env...

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