Air-coupled ultrasonic testing transducer sound field characteristic measuring device

Abstract

The invention relates to a device suitable for measuring the sound field characteristics of an air-coupled ultrasonic detection transducer, which solves the problem of calibration of the sound field characteristics of the air-coupled ultrasonic transducer and realizes automatic measurement of the focal length, focal area length and focal area width of the transducer's sound field. and sound beam spread angle characteristics. The sound field measurement device of the present invention includes: a scanning mechanism, an ultrasonic transceiver and signal acquisition system, a motion control system, a sound axis alignment mechanism, and a micro-hole silencer. The ultrasonic transceiver mode of the measurement system is a transmit-receive mode, and is carried out in a closed transparent chamber. During measurement, the receiving transducer is installed on a fixed bracket, and the measured air-coupled transducer is installed through the acoustic axis alignment mechanism. The sound beam axis is adjusted to coincide with the Z-axis. The pulse sound field emitted by the air-coupled ultrasonic transducer is received by the receiving transducer with a micro-hole silencer attached. The peak value of the pulse echo signal is calculated by the computer through the data acquisition card, and this voltage peak is used as the sound pressure of the acoustic signal. amplitude. The computer drives the ultrasonic transducer to perform spatial scanning motion relative to the receiving aperture through the motion control system, and the spatial sound field sound pressure distribution of the air-coupled ultrasonic transducer can be measured.

Description

1. Technical field [0001] The invention relates to a device suitable for measuring sound field characteristics of an air-coupled ultrasonic detection transducer, comprising: a scanning mechanism, an ultrasonic transceiver and signal collection system, a motion control system, a sound axis alignment mechanism, and a microhole sound barrier. 2. Background technology [0002] Air-coupled ultrasonic transducers and air-coupled ultrasonic testing technology can avoid many troubles caused by liquid coupling due to their non-contact characteristics. The traditional ultrasonic testing method requires a special coupling agent (such as water, etc.) or a complete water immersion method to reduce the loss of ultrasonic waves in the transmission medium. These coupling conditions limit its application in many occasions, such as the measured object does not allow water immersion Or contact is not allowed, such as the detection of porous water-permeable materials, food, medicine, etc., the ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a device for calibrating the sound field characteristics of an air-coupled ultrasonic transducer, which solves the problem of calibrating the sound field characteristics of the air-coupled ultrasonic transducer, and realizes the automatic measurement of the focal length, focal length, focal region width and Beam spread angle characteristics

Images