Measuring and testing – Vibration – By mechanical waves
Patent
1994-02-15
1996-04-30
Chilcot, Richard
Measuring and testing
Vibration
By mechanical waves
73610, G01N 2904
Patent
active
055114245
ABSTRACT:
A preamplification and impedance matching circuit for an electromagnetic acoustic transducer includes an impedance matching section of the circuit having input terminals for receiving radio frequency power from a radio frequency power source. A matching transformer, which is a step-down transformer, is operatively connected to the input terminals. Diode networks are operatively connected to the matching transformer and output terminals which lead to the coil of the transducer. Signal responses emitted by the transducer coil are transmitted to a preamplifier section of the circuit. Choke coils or resistors are used to limit radio frequency power entry into the preamplifier section of the circuit. The preamplifier section has a preamplifier which is operatively connected to a first transformer and a second transformer such that the transformer are located on opposite sides of the preamplifier for increasing the amplitude of the coil signal response prior to transmission to detectors located in the instrumentation of the transducer.
REFERENCES:
patent: 3982425 (1976-09-01), McLain
patent: 4202210 (1980-05-01), Multon et al.
patent: 4229666 (1980-10-01), Milburn, Jr.
patent: 5303591 (1994-04-01), Dykes et al.
patent: 5309765 (1994-05-01), Horigome et al.
U.S. Pat. Application Ser. No. 08/196,662, Our Case 5432 filed Feb. 15, 1994.
Flora John H.
Henderson Karl C.
MacLauchlan Daniel T.
Chilcot Richard
Edwards Robert J.
Kalka Daniel S.
Noori Max
The Babcock & Wilcox Company
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