Method and apparatus for zero point calibration of...

Details Method and apparatus for zero point calibration of... Method and apparatus for zero point calibration of...

G - Physics

01

B

349/29, 349/41

G01B 17/02 (2006.01) G01N 29/24 (2006.01) G01N 29/30 (2006.01)

Patent

CA 1126384

METHOD AND APPARATUS FOR ZERO POINT CALIBRATION OF ULTRASONIC THICKNESS GAUGE ABSTRACT A transducer for an ultrasonic thickness gauge of the pitch and catch type has transmitting and receiving transducer elements on adjoining blocks of delay material separated by an acoustic barrier is calibrated by operating the receiving trans- ducer element in pulse-echo mode. The lengths of the two delay blocks differ by an amount calculated to make the pulse-echo tra- vel time in the longer delay block greater than pitch and catch travel time by an amount at least equal to the geometric delay of the transducer to provide an unambiguous readout during pulse- echo operation when the gauge is adjusted to the proper zero point calibration for the transducer. -1-

336143

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