Three-dimensional combined hydrophone

Abstract

The invention relates to the field of hydrophones, in particular to a three-dimensional combined hydrophone with the capacity of carrying out synchronous concurrent measurement on a sound pressure, a particle vibration velocity and a vibration velocity first-order space partial derivative. The three-dimensional combined hydrophone comprises two-dimensional vector hydrophones, a sound pressure hydrophone and a rigid frame, wherein the two-dimensional vector hydrophones are suspended at the center of the rigid frame, the sound pressure hydrophone is fixed at the center of the rigid frame, and the vector hydrophones are arranged on two sides of the sound pressure hydrophone in a pairwise symmetry manner. The sound pressure, the particle vibration velocity and the vibration velocity first-order space partial derivative in an underwater plane wave sound field can be completely measured by using six two-dimensional vector hydrophones and one sound pressure hydrophone, and all components of the sound pressure, the particle vibration velocity and the vibration velocity first-order space partial derivative can be completely measured, thus the three-dimensional combined hydrophone has a simple structure and is more accurate in directivity.

Description

Technical field [0001] The invention relates to the field of hydrophones, in particular to a three-dimensional combined high-directivity hydrophone with the ability to simultaneously measure sound pressure, particle vibration velocity and first-order spatial partial derivative of vibration velocity. Background technique [0002] The high-directivity hydrophone is a kind of sound pressure (one component), particle vibration velocity (three components) and the first-order partial derivative (nine components) in the underwater harmonic and plane wave sound field. The sensor, the vibration velocity of the water quality point and the sound pressure gradient of the water quality point, the displacement and acceleration of the vibration and other vectors can be converted to each other. The first partial derivative of the vibration velocity space of the water quality point is the second order partial derivative of the sound pressure space of the water quality point and the vibration displ...

AI Technical Summary

Problems solved by technology

[0003] At present, there have been a small number of patents and documents published on high-directivity hydrophones. This type of high-directivity hydrophone uses a large number of sensors to achieve the purpose of measuring the first-order partial derivative of the vibration velocity space, resulting in hydrophones The structure of the hydrophone is complex and the reliability is poor. Although some high-directivity hydrophones simplify the structure, they cannot completely measure all the components of the sound pressure, particle vibration velocity and the first-order partial derivative of the vibration velocity space.

Images