Trivector hydrophone based on piezoelectric velocity sensor

Abstract

The invention provides a trivector hydrophone based on a piezoelectric velocity sensor, which comprises a spheroid, and hanging elements, a velocity sensor and a multi-core output tape cable all arranged in the spheroid, wherein the velocity sensor comprises three piezoelectric velocity sensors which are connected in sequence through connecting rods; one end of the four hanging elements is fixed on the middle piezoelectric velocity sensor, while the other end extends out of the spheroid; and the spheroid is a solid sphere. The average density of the vector hydrophone approximates to the water medium density; the channel sensitivity is high in a working frequency band below 2,000 hz and is irrelevant to the frequency; the vector hydrophone has good cosine directivity; and the vector hydrophone is not limited by an obliquity during working. The vector hydrophone can be widely used in various fields of hydroacoustics, such as sonobuoys, low noise motion target measurement, target orientation and the like.

Description

(1) Technical field [0001] The invention relates to a vector hydrophone, in particular to a co-vibration vector hydrophone using a piezoelectric velocity sensor as a vibration pickup unit. (2) Background technology [0002] Generally, the acceleration sensor is used as the vibration pickup unit inside the vector hydrophone. It can measure the vibration acceleration at the particle in the underwater sound field with time synchronization and space common point. On this basis, the vibration at the particle can be obtained through integral operation. speed and displacement. However, the sensitivity of the vector channel of the vector hydrophone based on the acceleration sensor decreases with the decrease of the operating frequency. At present, vector hydrophones in the low frequency band (less than 1000 Hz) have been widely used in the field of underwater acoustics. [0003] In the 2007 master's degree thesis of Harbin Engineering University, "10-100Hz Vector Hydrophone Develo...

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Problems solved by technology

[0003] In the 2007 Harbin Engineering University master's degree thesis "10-100Hz Vector Hydrophone Development and Testing Method Research", "Acoustic Technology" 2007, Vol. A vector hydrophone made of a coil velocity sensor, the upper frequency band is 100Hz, and the free-field voltage sensitivity of the three channels is lower than -210dB

The interior of the vector hydrophone is a six-polarity moving coil vibration velocity sensor that can only work in the horizontal direction and vertical direction. If the channel axis of the vector hydrophone deviates from the horizontal or vertical direction by more than 10 degrees during use, the dynamic The coil sensor cannot work, which is limited by the working principle of the moving coil speed sensor, which seriously restricts the actual engineering application of the vector hydrophone

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