Inspection apparatus

Details Inspection apparatus Inspection apparatus

1991-04-23

1993-12-28

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

36472803, 36472807, 364819, 367125, 367126, G01N 2922

Patent

active

052729230

ABSTRACT:
An inspection apparatus utilizing a pulse compression technique is described which comprises a signal generator, a transmission/reception probe; first and second correlators and an adder. The signal generator generates a composite transmission signal consisting of signals Sap(t), Saq(t), Sbp(t) and Sbq(t) respectively based on a basic unit signal ga(t) and a sequence {p}, the signal ga(t) and a sequence {q}, a basic unit signal gb(t) and the sequence {p}, and the signal gb(t) and the sequence {q}, to the probe to transmit the composite transmission signal to a target. The first correlator performs a correlation operation of echo signals Rap(t), Raq(t), Rbp(t) and Rbq(t) corresponding to the signal Sap(t), Saq(t) and Sbq(t) by utilizing reference signals Ua(t) and Ub(t) based on the sequences to provide results Caap(t), Caaq(t), Cbbp(t) and Cbbq(t). The second correlator performs a correlation operation of the results Caap(t), Caaq(t) Cbbp(t) and Cbbq(t) by utilizing the sequences {p} and {q} to provide compressed pulses Caapp(t), Caaqq(t), Cbbpp(t) and Cbbqq(t). These pulses are summed up at the adder to provide a composite compressed pulse C having the large amplitude main lobe and small amplitude side lobes.

REFERENCES:
patent: 2907400 (1959-10-01), Swafford, Jr.
patent: 3763465 (1973-10-01), Tatge et al.
patent: 3968471 (1976-07-01), Savit
patent: 4156876 (1979-05-01), Debuisser
patent: 4198704 (1980-04-01), Munson
patent: 4224679 (1950-09-01), Nossen et al.
patent: 4245326 (1981-01-01), Gutleber
patent: 4471785 (1984-09-01), Wilson et al.
patent: 4542653 (1985-09-01), Liu
patent: 5000183 (1991-03-01), Bonnefous
patent: 5043951 (1991-08-01), Gilmour et al.
patent: 5060515 (1991-10-01), Kanda et al.
patent: 5065629 (1991-11-01), Koike et al.
patent: 5203823 (1993-04-01), Wadaka et al.
von M. Platte, "Barker-codierte Mehrschichtwandler aus Polyvinyl-idenflurid . . . ," Acustica, vol. 56 (1984), pp. 29-33. (German).
K. M. Sung, "Piezoelectric Multilayer Transducers . . . ," 366 Ultrasonics vol. 22 (1984) Mar., No. 2, Guildford, Surrey, Great Britain.
B. B. Lee and E. S. Fergason, "Time Gain Control in Spread Ultrasound," vol. 18, No. 3, May 1980, pp. 136-137.
Ultrasonic Testing of Materials, by Nihon Moritsu Kyokai, Feb. 25, 1980, pp. 177-181, pp. 296-298 (Japanese).
Golay, M. "Complementary Series," IRE Transactions on Information Theory, vol. IT-7, Apr. 1961 (pp. 82-87).
"Construction and Mode of Operation of a Pulse-Edge Instrument," and Chapter 17, pp. 205-210, 344-347, translation of Reference 4.

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