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
1975-04-24
1976-12-14
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
G01N 2904
Patent
active
039967913
ABSTRACT:
In a pulse-echo ultrasonic test arrangement the back reflected echo acoustic wave signal as well as the scattered longitudinal wave and scattered shear wave signals are utilized in an evaluation circuit for determining more accurately the characteristics of a defect in a workpiece. The evaluation circuit, most suitably, includes a digital computer which in a typical embodiment of the invention is programmed to provide by Fourier transforms the frequency amplitude spectrum and the frequency phase spectrum of the supplied three signals, hence producing six characteristic outputs for a particular defect.
REFERENCES:
patent: 3140600 (1964-07-01), Howry
patent: 3299694 (1967-01-01), Dickenson
patent: 3332278 (1967-07-01), Wood et al.
patent: 3515990 (1970-06-01), Robertson
patent: 3776026 (1973-12-01), Adler
patent: 3857052 (1974-12-01), Beller
P. S. Fuss et al., Making the Fast Fourier Transform Really Fast, Bell Laboratories Record, Feb. 1973, 324-377 B.
Niklas Ludwig
Rose Joseph L.
Schlengermann Udo
Beauchamp John P.
Feig Philip J.
Gill James J.
Krautkramer-Branson Incorporated
Steinberg Ervin B.
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