Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1975-05-08
1976-12-28
Gill, James J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 679, G01N 2904
Patent
active
039994228
ABSTRACT:
The invention concerns an apparatus and method for ultrasonically testing thick-walled workpieces at an increased scanning speed by the use of a plurality of ultrasonic test probes wherein the probes are selectively rendered operable. The transmit probes are temporarily inhibited from transmitting search signals into the workpiece for a time interval during which the receipt of a defect responsive echo signal by a receive transducer is anticipated. The scan frequency is determined therefore by a clock circuit and the transmission of search signals is halted only temporarily for a brief period during which time there is no skipping in the predetermined transmitting sequence of the transducer probes.
REFERENCES:
patent: 3481186 (1969-12-01), Cellitti et al.
patent: 3485087 (1969-12-01), Brech
patent: 3805597 (1974-04-01), Ohta et al.
patent: 3872715 (1975-03-01), Pittaro
Lehmann Kai
Rehrmann Manfred
Feig Philip J.
Gill James J.
Krautkramer-Branson Incorporated
Kreitman Stephen A.
Steinberg Ervin B.
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