Measuring and testing – Vibration – By mechanical waves
Patent
1981-06-03
1983-11-15
Kreitman, Stehen A.
Measuring and testing
Vibration
By mechanical waves
73602, 128660, G01N 2900
Patent
active
044148500
ABSTRACT:
A measurement method and system for measuring characteristics of attenuation of domains in an object comprises transmitting ultrasonic waves into the object and receiving ultrasonic waves reflected from the object. The measured characteristics of attenuation of reflected waves is determined using signal intensities. A plurality of ultrasonic waves having different frequencies are transmitted either simultaneously or alternately to an object, and the reflected waves are received from the object. The signal intensities corresponding to the transmission frequencies among the reflected waves are stored and the signal intensity ratio is calculated. The signal intensity ratio indicates the attenuation characteristic. The attenuation coefficient can also be obtained using a time interval from the transmission time to the time of the reflected wave is received. The attenuation slope can be obtained from this attenuation coefficient and the frequency difference between transmitted ultrasonic waves.
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Miwa Hirohide
Murakami Keiichi
Shimura Takaki
Fujitsu Limited
Kreitman Stehen A.
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