Method and device for calibrating ultrasonic water-immersed piezoelectric probe

Abstract

The invention discloses a method and device for checking ultrasonic water immersion piezoelectric probe. The method comprises the steps of carrying out connection on a pulse generator and an externalresistor, and measuring an input current signal; separating the pulse generator and the external resistor, carrying out connection on the pulse generator and a probe, and measuring an output current signal flowing through the probe; obtaining an acoustic propagation function, acoustic radiation impedance, a resistance value of the external resistor and the resistance value of the pulse generator;and multiplying the output current signal by resistance value sum of the external resistor and the pulse generator to obtain a first product, carrying out multiplication on the input current signal, the acoustic propagation function and the acoustic radiation impedance to obtain a second product, dividing the second product by the first product and then solving a square root, thereby obtaining sensitivity of the probe. According to the technical scheme provided by the invention, the sensitivity of the probe can be measured only by measuring the current signal, a test process is simplified, andthe problem that impedance is mismatched in a conventional circuit is solved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic water-immersed piezoelectric probes, in particular to a method and device for calibrating ultrasonic water-immersed piezoelectric probes. Background technique [0002] Ultrasonic water immersion piezoelectric probes such as planar, point-focused and line-focused probes are widely used in the field of ultrasonic nondestructive testing. The ultrasonic probe plays the role of transmitting and receiving ultrasonic signals, converting acoustic signals and electrical signals during the detection process. The sensitivity of the probe is an important parameter to describe the ability of the probe to convert acoustic electricity and evaluate the bandwidth of the probe. Therefore, measuring the sensitivity of the probe is an important part of judging the consistency of the ultrasonic probe and evaluating the detection ability of the detection system. [0003] Currently, there are many methods for calib...

AI Technical Summary

Problems solved by technology

[0005] The commonly used self-reciprocity calibration method needs to measure the current and voltage flowing into and out of the probe, but research shows that due to the impedance mismatch between the signal generator / cable / probe in the pulse reflection circuit, the current and voltage flowing into and out of the probe The electrical signals will superimpose on each other to distort the signal

The distortion of this signal will lead to errors in the measurement results of the probe sensitivity, so the signal distortion must be eliminated in the actual calibration

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