Tracking bandpass filter for conditioning vibrator accelerometer

Details Tracking bandpass filter for conditioning vibrator accelerometer Tracking bandpass filter for conditioning vibrator accelerometer

1975-05-01

1977-11-01

Wilbur, Maynard R.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

340 155TC, 340 155TD, G01V 102

Patent

active

040561631

ABSTRACT:
An accelerometer located on the pad of a vibratory seismic source provides a signal for comparison with the sweep signal which controls the vibrator. The error function representing the difference between the phases of these two signals is used to adjust the phase of the vibrator so as to maintain the vibrator in synchronism with the sweep signal. Prior to comparison with the sweep signal, the accelerometer output is conditioned by a tracking bandpass filter having its center frequency slaved to the instantaneous sweep frequency. Those components of the accelerometer output signal having a frequency equal to the instantaneous sweep frequency are passed by the bandpass filter and are subjected to approximately 0.degree. phase shift through the filter.

REFERENCES:
patent: 3698508 (1972-10-01), Landrum, Jr.
patent: 3721954 (1973-03-01), Fontanel et al.
patent: 3858170 (1974-12-01), Freeman et al.
patent: 3863202 (1975-01-01), Landrum, Jr.
patent: 3881167 (1975-04-01), Pelton et al.

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