Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1996-11-21
1998-06-23
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
G01S 1500
Patent
active
057712042
ABSTRACT:
An apparatus and method for measuring the relative phase of echo signals in a multiple-echo system. A signal generator generates an exciting tone burst and subsequent tone bursts delayed in phase from the exciting tone burst. The exciting tone burst is gated into a transducer coupled to the multiple-echo system. Each subsequent tone burst is converted into a series of pulses. Each pulse triggers a sample/hold circuit to sample each echo signal. The samples of the echo signal are averaged and then compared to a reference value. The signal generator is controlled to vary the subsequent tone burst phase delay to determine for each echo signal a subsequent tone burst phase delay that causes the average of the samples of the echo signal to be substantially equal to the reference value wherein the determined subsequent tone burst phase delay is the phase delay of the echo signal with respect to the exciting tone burst. The control circuit then determines the difference in phase delay between echo signals to determine the relative phase delay of the echo signals.
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M.e. Froggatt et al., "Interrupted ultrasonic bolt load measurements using the pulsed phase-locked loop system", IEEE Transactions on Instrumentation and Measurement, vol. 45, No. 1, Feb. 1996, pp. 112-116
M. E. Froggatt et al, "Pulsed phase-locked loop calibration over frequency", IEE Transaction on Instrumentation and Measurement, vol. 45, No. 1, Feb. 1996, pp. 123-126.
Edwards Robin W.
Pihulic Daniel T.
The United States of America as represented by the Administrator
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