FM transmitter and receiver for use with non-destructive testing

Details FM transmitter and receiver for use with non-destructive testing FM transmitter and receiver for use with non-destructive testing

1977-08-24

1979-10-09

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324240, 324242, G01R 3312

Patent

active

041707559

ABSTRACT:
Transducer means mounted on a moving head produce test signals which modulate an FM transmitter on the moving head. A stationary FM receiver has demodulation means including a toggle flip-flop supplied with an FM signal corresponding to the transmitted signal, preferably an IF signal. The flip-flop changes state when its input passes through a threshold level and yields a rectangular wave output, and preferably also the inversion thereof. Short pulses are produced at edges of the rectangular wave, as by differentiation. The short pulses are applied to a sawtooth generator, preferably of the constant charging current type, to produce sawtooth waves whose amplitude and duration are proportional to the periodicity of the pulses. The sawtooth waves are filtered and the output applied to apparatus for processing and indicating variations in the object being tested. The output varies as an inverse function of frequency of the signal applied to the flip-flop and is corrected by non-linear amplifying means, advantageously connected in the modulating path of the FM transmitter.

REFERENCES:
patent: 2340609 (1944-02-01), Mestas
patent: 2530081 (1950-11-01), Ross
patent: 2956227 (1960-10-01), Pierson
patent: 3170113 (1965-02-01), Harmon

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