Trivector hydrophone based on piezoelectric velocity sensor

A speed sensor and three-dimensional vector technology, applied in radio wave measurement systems, instruments, measurement devices, etc., can solve the problems of low free field voltage sensitivity, restricting the engineering application of vector hydrophones, etc., and achieve good cosine directivity and simple structure. , the effect of high channel sensitivity

Inactive Publication Date: 2009-10-21
HARBIN ENG UNIV
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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

Method used

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  • Trivector hydrophone based on piezoelectric velocity sensor
  • Trivector hydrophone based on piezoelectric velocity sensor
  • Trivector hydrophone based on piezoelectric velocity sensor

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Embodiment Construction

[0021] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0022] to combine figure 1 . The composition of the present invention includes a cable [5] with a multi-core output belt, four suspension rods [4], three piezoelectric speed sensors [1], connecting rods [2] and solid spheres [3]. Four suspension rods are evenly distributed on the outer surface of the sphere. Three piezoelectric speed sensors are respectively placed in sequence along the vertical direction, and their axial directions point to the three coordinate directions of X, Z and Y respectively.

[0023] The preparation method of the present invention is as follows: firstly, three piezoelectric speed sensors [1] are rigidly connected in the vertical direction by means of connecting rods [2], and then four suspension rods [4] are evenly fixed in the middle of the speed sensor [ 1], place the connected three speed sensors [1] with four suspension rods [4] in...

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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...

Claims

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Application Information

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IPC IPC(8): G01H11/08G01S7/521
Inventor 洪连进杨德森
Owner HARBIN ENG UNIV
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