Co-vibration particle vibration velocity sensor of water medium

Abstract

The invention relates to a co-vibration particle vibration velocity sensor of a water medium, and belongs to the field of underwater acoustic sensors. The sensor comprises a moving coil energy transducer, a rigid mass block, a composite material wrapping layer, a suspension support, a flexible suspension spring and a connecting cable. A vibration velocity unit formed by the moving coil energy transducer and the rigid mass block is used to obtain flat reception frequency response, and the vibration velocity of the water medium can be measured within a wider frequency band range; and the ratio of a composite material is adjusted so that the sensor can suspend freely in the water medium without buoyancy, the flexible suspension spring ensures that the sensor and the water medium in the surrounding vibrate in the same phase, and the vibration velocity of a particle of the water medium is detected accurately. The whole sensor is characterized by simple structure, high sensitivity and standard spatial direction, and is convenient to manufacture and use in practical.

Description

technical field [0001] The patent relates to a water medium particle velocity measurement sensor, which is mainly used for detecting the water medium particle velocity under the action of sound waves, and belongs to the field of underwater acoustic sensors. Background technique [0002] In underwater acoustic measurement, particle velocity is generally derived from sound pressure or sound pressure gradient. The most commonly used measurement methods are pressure gradient sensors or sound pressure hydrophones. [0003] The sound pressure gradient is proportional to the force, therefore, the output of the pressure gradient sensor is proportional to the particle acceleration according to Newton's law. However, the frequency response of the pressure gradient sensor is not flat, and the output phase differs from the inherent velocity phase by 90°, so the measurement results must be corrected. Other methods of measuring particle velocity include the double hydrophone method, whi...

AI Technical Summary

Problems solved by technology

Since the technique relies on the difference between the signals produced by the two hydrophones, the measured signal is noisy

If the sensitivities of the two measuring hydrophones are inconsistent, the accuracy of the measurement results will be directly affected; at the same time, the dynamic range of the measurement method is also very limited

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