Measuring and testing – Vibration – By mechanical waves
Patent
1994-09-02
1996-09-10
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73611, 73613, 73620, 73631, 73634, G01N 2904
Patent
active
055534996
ABSTRACT:
Ultrasonic wave converged by an acoustic lens is made incident onto a sample and wave reflected from the sample is received and converted into received electric signal by a transducer. A part of this electric signal is picked up by a gate section and the signal thus picked up is applied to an attenuator where it is converted into a variable ratio of input to output. The strength of the signal thus gain-adjusted is compared with a threshold value by a comparator. Responsive to the comparison result thus obtained, the gain of the attenuator is adjusted to make the input/output ratio of the attenuator a desired value. A computer calculates the focus position of the acoustic lens from a gain curve of the attenuator changing when the acoustic lens is moved from a position, remote enough from its focus position, to the sample. Drivel signal responsive to the result thus calculated is applied to a Z-drive control section. As the result, the distance of the acoustic lens relative to the sample is adjusted to bring the acoustic lens to the focus position.
REFERENCES:
patent: 4683751 (1987-08-01), Imade et al.
Endo Tomio
Hisata Nahoko
Moller Richard A.
Olympus Optical Co,. Ltd.
Williams Hezron E.
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