Ultrasonic liquid-immersing transducer sound field precision measurement method

Abstract

The invention relates to a precise measuring method of a sound field of an ultrasound liquid-immersed transducer, which is characterized by comprising three steps, wherein, the first step is that sound pressure value at each measuring point in the sound field of the measured transducer and reflected by a small steel ball without a borehole is measured and store; the second step is that the sound pressure value at each measuring point in the sound field of the measured transducer and reflected with the steel ball drilled with a through hole is measured and stored; the third step is that the stored sound pressure value at each measuring point in the sound field of the measured transducer and reflected by the steel ball without a borehole minus the stored sound value at each measuring point in the sound field of the measured transducer and reflected by the steel ball drilled with the through hole so as to obtain the sound pressure value with the same value as the through hole diameter of the steel ball drilled with the through hole, the smaller the through hole, the closer the calculated sound pressure value to the sound pressure value of one point.

Description

Technical field: [0001] The invention relates to a precise measurement method for the sound field of an ultrasonic liquid immersion transducer, in particular to a precise measurement method for the sound field of an ultrasonic water immersion transducer. Background technique: [0002] The performance of ultrasonic liquid immersion transducer plays a very important role in ultrasonic non-destructive testing technology. The sound pressure distribution characteristic of the sound field is one of the important performance parameters to measure the ultrasonic transducer. It has great influence on the resolution and positioning of defect detection. It has a great influence on the judgment of the size and size. With the increase of the service time of the ultrasonic liquid immersion transducer, the phenomenon of matching layer wear and electromechanical coupling performance degradation will occur, which will lead to the performance change of the ultrasonic liquid immersion transduce...

AI Technical Summary

Problems solved by technology

This method requires the size of the ball to be small, preferably an ideal point, but in actual use, the size of the ball should not be too small, because if the size of the ball is too small, the ultrasonic wave reflected by the ball will be correspondingly weak. In this way, the transducer under test may not receive the weak ultrasonic signal, or the amplitude of these weak ultrasonic signals is comparable to that of the noise signal, and the transducer under test cannot be used even if it receives the ultrasonic signal. effective analytical calculations

Therefore, small balls with a diameter of 4-5 mm are generally used as reflectors. In the measurement of the sound field of reflective balls based on this size, the measurement accuracy is not high, and it cannot correctly reflect the real sound field of the ultrasonic liquid immersion transducer.

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