Ultrasonic transducer

Measuring and testing – Vibration – By mechanical waves

Reexamination Certificate

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C073S632000, C073S643000

Reexamination Certificate

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11172129

ABSTRACT:
An ultrasonic transducer having an effective center frequency of about 42 MHz; a bandwidth of greater than 85% at 6 dB; a spherical focus of at least 0.5 inches in water; an F4 lens; a resolution sufficient to be able to detect and separate a 0.005 inch flat-bottomed hole at 0.005 inches below surface; and a beam size of approximately 0.006–0.008 inches measured off a 1½ mm ball in water at the transducer's focal point.

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U.S. Appl. No. 10/803,518, Mar. 17, 2004, Taylor.

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