| 摘要 |
PROBLEM TO BE SOLVED: To enhance an S/N ratio showing the sensitivity of a receiving waveform and to improve the rising characteristics of a waveform showing easiness to trigger. SOLUTION: The thickiness of the matching layer of a transmitter-receiver for transmitting and receiving ultrasonic waves is set to 0.18-0.22λ, preferably 0.2λof a wavelengthλcalculated from a matching layer material not only to enhance measuring accuracy but also to reduce an error.
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