Seismic vibrator phase detector

Details Seismic vibrator phase detector Seismic vibrator phase detector

1976-04-07

1978-01-10

Behrend, Harvey E.

Communications: electrical

Selective

Interrogation response

181121, 181401, 324 83D, 324 83FE, G01V 116

Patent

active

040682102

ABSTRACT:
A phase detector for detecting the phase difference between a pilot reference signal and a feedback signal generated by movement of a vibrator baseplate. The detector includes a phase shifter for providing a delayed reference signal phase-shifted from the pilot reference signal by 90.degree.. A pair of multiplier circuits generate the products of the pilot reference signal times the feedback signal and the delayed reference signal times the feedback signal. A pair of integrators integrate the multiplier outputs over one full cycle of pilot reference signal. A divider generates the quotient of the integrator outputs at the end of each integration cycle. This quotient is proportional to the tangent of the phase difference between the pilot reference signal and the fundamental frequency component of the feedback signal. An arctangent decoder circuit converts the divider output to the actual phase-angle difference. This phase difference information is then used to shift the phase of the input to the vibrator to cause the vibrator baseplate to move in phase with the pilot reference signal.

REFERENCES:
patent: 3626267 (1971-12-01), Bobbitt
patent: 3698508 (1972-10-01), Landrum, Jr.
Balodis, M. "Laboratory Comparison of Tanlock and Phase-Lock Receiver", Proc. Nat. Telem Conf. Paper 5-4, 1964, pp. 1-11.

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