Calibration device and calibration method for equivalent self noise acceleration spectrum level of low-noise vector hydrophone

Abstract

The invention provides a calibration device and a calibration method for the equivalent self-noise acceleration spectrum level of a low-noise vector hydrophone. It is mainly composed of underwater acoustic tube, vacuum tube, electromagnetic shielding tube, vibration-damping base and upper cover. The noise self-spectrum measured by each vector hydrophone includes the self-noise spectrum and the environmental background noise spectrum, and the cross-correlation calculation of the noise signals of the two vector hydrophones can obtain the environmental background noise spectrum, and then through the known vector hydrophone The transfer function of the earphone can be calculated to obtain the equivalent self-noise acceleration spectrum level of the respective vector hydrophones. The present invention effectively reduces external vibration, electric, electromagnetic and acoustic interference, makes the background noise of the test environment extremely low, and thus better satisfies the calibration accuracy of the equivalent self-noise acceleration spectrum level parameters of the low-noise vector hydrophone It improves the evaluation effectiveness of the self-noise level of the low-noise vector hydrophone, and ensures the engineering application quality of the low-noise vector hydrophone.

Description

technical field [0001] The invention relates to a calibration device for the equivalent self-noise acceleration spectrum level of a vector hydrophone. The invention also relates to a method for calibrating the equivalent self-noise acceleration spectrum level of a vector hydrophone. Background technique [0002] The vector hydrophone can measure the vibration velocity (or acceleration) and sound pressure of the particle in water at the same time and at the same point, and it has been widely used in recent years. At present, the most commonly used vector hydrophone is the acceleration type co-vibration vector hydrophone, and the physical quantity detected by it is the acceleration of particle in water. For a sound pressure sensor, the quantity that characterizes its self-noise is the equivalent noise sound pressure spectrum (level); correspondingly, for an acceleration vector hydrophone, the quantity that characterizes its self-noise is the equivalent self-noise acceleration...

AI Technical Summary

Problems solved by technology

In fact, no matter what method is used, the influence of environmental background noise cannot be completely eliminated.

[0007] So far, there is no public report on the calibration method and calibration device of the equivalent self-noise acceleration spectrum level of the low-noise vector hydrophone in water

Images