发明名称 |
Material characteristic testing method and apparatus using interferometry to detect ultrasonic signals in a web |
摘要 |
A non-destructive, non-contact testing apparatus and method which generally includes an ultrasonic signal generator for inducing one or more ultrasonic signals in a material and an optical interferometer that includes a laser for illuminating a section of the material and for detecting beat frequencies resulting from reflected light from the material. Deformations in the material as a result of the ultrasonic signal cause the beat frequency to be shifted as a result of the Doppler effect. Such differences in the beat frequency are detected by the system and used as an indication of a characteristic of the material.
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申请公布号 |
US5814730(A) |
申请公布日期 |
1998.09.29 |
申请号 |
US19960662463 |
申请日期 |
1996.06.10 |
申请人 |
INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY AND GEORGIA INSTITUTE OF TECHNOLOGY |
发明人 |
BRODEUR, PIERRE H.;BERTHELOT, YVES H.;GERHARDSTEIN, JOSEPH P.;JOHNSON, MONT A. |
分类号 |
G01N29/07;G01N29/24;(IPC1-7):G01N29/08 |
主分类号 |
G01N29/07 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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