Measuring and testing – Vibration – By mechanical waves
Patent
1990-02-23
1992-01-07
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73602, 73597, 73627, 310326, 310327, G01N 2918, G01N 2924
Patent
active
050780131
ABSTRACT:
A high-damping probe capable of obtaining not only sound velocity information but also other ultrasonic information useful for ultrasonic testing, such as the frequency and amplitude of the received wave, and also capable of increasing the accuracy of ultrasonic testing of structures made of concrete or other materials. The high-damping probe includes a transducer having a low-frequency damper attached thereto. By virtue of the above-described arrangement, the transmission wave will not oscillate for a long period of time and it is therefore possible to clearly discriminate between the transmission wave and the received wave. Since the received wave can be distinctly separated from the transmission wave, it is possible to obtain ultrasonic information such as the frequency and amplitude of the received wave. Further, it is possible to impart wide-band frequency characteristics to the probe, so that it becomes conformable to an ultrasonic testing device wherein the transmission frequencyt is variable. In addition, an ultrasonic measuring apparatus using the high-damping probe enables highly accurate measurement of the sound velocity of the shear wave, the thickness of the object and the position of an internal void.
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Imai Minoru
Kuramochi Mitsugu
Finley Rose M.
Shimizu Construction Co. Ltd.
Williams Hezron E.
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