Asymmetric structure three-dimensional co-vibrating spherical vector hydrophone

Abstract

The invention provides a 3D co-vibration spherical vector hydrophone with an asymmetrical structure which includes an upper half spherical shell, a lower half spherical shell, an output cable and a core vibrator; the core vibrator consists of three piezoelectric accelerometers which are asymmetrically arranged on a central mass block; the core vibrator is arranged in a supporting flange; the supporting flange is clamped between the upper half spherical shell and the lower half spherical shell by a bolt and a seal ring. The quantities of the internal piezoelectric accelerometers needed by the hydrophone of the invention are less, the integral average density is low and the physical dimension is small; besides, the internal piezoelectric accelerometers have better cosine directivity and phase characteristics. Therefore, the low-frequency vector hydrophone not only has the advantages of small size, light weight and good directivity, but also has the advantages of good channel sensitivity and phase characteristics; the hydrophone can solve the design problem of a sonar array. The 3D co-vibration spherical vector hydrophone with the asymmetrical structure can be broadly applied into each field of underwater sound like a sonobuoy system, a low noise measuring system, a double-base sonar system, a torpedoe navigation system, an underwater communication system, a responder, and the like, to accomplish a lower frequency measuring task.

Description

(1) Technical field [0001] The invention relates to an underwater signal receiving device, in particular to a three-dimensional co-vibration spherical vector hydrophone. (2) Background technology [0002] The vector hydrophone is a new type of underwater receiving transducer, which can measure the sound pressure and particle vibration velocity, or sound pressure and particle acceleration, or sound pressure and sound Scalar and vector information in underwater sound fields such as pressure gradients. According to different working principles, vector hydrophones can be divided into two categories: differential pressure vector hydrophones and co-vibration vector hydrophones. At present, the co-vibration vector hydrophone is widely used in various fields of underwater acoustic engineering, especially in the low frequency band (below 1000Hz). [0003] "Applied Acoustics", 2001, 20(4): 15-20, in the article titled "Characteristics and Structural Design of Three-dimensional Co-vi...

AI Technical Summary

Problems solved by technology

Therefore, the three-dimensional co-vibration spherical vector hydrophone is usually designed with a symmetrical structure, that is, two vibration sensors are placed symmetrically on each of the three orthogonal channels, and six vibration sensors are evenly distributed on a spherical surface to ensure To meet the above conditions, the three-dimensional co-vibration spherical vector hydrophone with a symmetrical structure design needs six vibration sensors inside, and the phase consistency requirements for each pair of paired sensors are very strict, otherwise the phase inconsistency of the two paired sensors will cause The sensitivity and phase characteristics of this channel are inconsistent with those of other channels, mainly affecting the working frequency band and narrowing the working frequency band. This structure will not only make the design cost of the co-vibration vector hydrophone very high, but also have high quality and high density. Unstable performance

In addition, the greater the number of vibration sensors placed inside the co-vibration vector hydrophone design, the more complex the wiring, and the thicker the corresponding connecting cables, which will have a greater impact on the working attitude of the co-vibration vector hydrophone and worse performance. Stablize

If the vibration sensor with a built-in circuit is used as the internal vibrator of the vector hydrophone, the more vibration sensors there are, the more signal conditioners need to be connected, and the more complex the subsequent processing circuit will be.

In short, the three-dimensional co-vibration vector hydrophone designed with a symmetrical structure has high density, high cost, poor consistency of amplitude-frequency and phase-frequency characteristics, complex structure, and cumbersome interface, which affects its engineering application, especially in the construction of vector hydrophones. Applications of array technology

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