A Sensitivity Measuring Method of USP Probe

Abstract

The invention discloses a method for measuring the sensitivity of a usp probe. The method comprises the following steps: setting a sound field; placing a to-be-tested usp probe and a to-be-tested reference sound pressure sensor at the same position of the sound field; calculating the sensitivity of the to-be-tested sound pressure sensor; setting a holographic surface H; scanning and measuring point by point the sound pressures on the holographic surface H and the mass point vibration speeds in the k direction; using the sound pressures or the mass point vibration speeds as holographic input; reconstructing the mass point speed or sound pressure for each measurement point on the holographic surface H; calculating the sound impedance of the mth measurement point; calculating the sensitivity of the mass point vibration speed sensor at the mth measurement point; and averaging the sensitivities of a plurality of measurement points. The method of the invention is based on the near-field acoustic holographic technology and directly obtains sound impedance in different directions from the measurement or reconstruction of sound pressures and the mass point vibration speeds in different directions. Beyond that, in combination with a reference sound pressure sensor, the measurement of the sensitivity of the usp probe in different directions could be performed, which increases the measurement efficiency and measurement precision.

Description

technical field [0001] The invention relates to a sensitivity measurement technology of a sensor, in particular to a sensitivity measurement method of a USP probe. Background technique [0002] The USP probe is a three-dimensional sound pressure-particle velocity sensor, which is mainly composed of a sound pressure sensor and three mutually orthogonal particle velocity sensors. To measure the sensitivity of the USP probe, it is necessary to measure the sound pressure sensor and the particle velocity Sensitivity of the sensor. At present, the sensitivity of the sound pressure sensor is easy to measure, just place it and the standard sound pressure sensor at the same point in the sound field, and then compare the sound pressure measured by the two to obtain the sensitivity of the sound pressure sensor; however, At present, there is no standard particle velocity sensor, so it is difficult to measure the sensitivity of the particle velocity sensor. [0003] Existing methods fo...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a sensitivity measurement method of a usp probe, and solve the technical problem that the particle vibration velocity sensor can only measure under specific conditions and the measurement efficiency is low in the prior art

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