Ultrasonic test method and apparatus with coupling liquid temper

Details Ultrasonic test method and apparatus with coupling liquid temper Ultrasonic test method and apparatus with coupling liquid temper

1979-11-19

1981-03-10

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73622, G01N 2900

Patent

active

042546605

ABSTRACT:
In an ultrasonic pulse-echo test measuring or gaging system wherein a workpiece is coupled to the ultrasonic transducer by a liquid coupling medium, the temperature of the liquid affects precise measurement of the workpiece as the acoustic velocity of a liquid changes with temperature. To compensate for the change of acoustic velocity during measurement periodically a search pulse is transmitted along its normal path over a calibrated fixed distance. The resulting transit time value is converted to a distance value and compared witht the calibrated distance value. Any difference in the values updates a compensation factor which subsequently is used in the test system. Periodic updating may be set to occur, for example, every one-half second.

REFERENCES:
patent: 3828609 (1974-08-01), Furon et al.
patent: 3848460 (1974-11-01), Bantz et al.
patent: 3850026 (1974-11-01), Lund et al.
H. E. Gundtoft et al., Materialpruefung, vol. 19, No. 9, pp. 385-388, Sep. 1977.

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