Methods of reducing harmonic distortion in continuous wave seism

Details Methods of reducing harmonic distortion in continuous wave seism Methods of reducing harmonic distortion in continuous wave seism

1986-07-10

1988-06-14

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

328163, 367143, 367190, 364421, H04R 2300, H04B 1504, G01V 0000

Patent

active

047516879

ABSTRACT:
Described is a method of driving a seismic vibrator with a control signal to produce an output signal having minimized harmonic distortion. The method includes the steps of producing a plurality a harmonic distortion signals related to a fundamental frequency of the control signal. The phase and amplitude of said harmonic distortion signal is varied to produce with the vibrator suites of variations of the distortion signal. From among suites of variations there is selected that harmonic distortion signal having phase and amplitude values which produce a minimum value in harmonic distortion signal amplitude. The steps are repeated for different fundamental frequencies and the selected signals are summed with their related fundamental frequencies to produce a vibrator sweep control signal. The seismic vibrator is driven with the control signal to produce an output in which harmonic distortion is significantly attenuated.

REFERENCES:
patent: 3906383 (1975-09-01), Andre et al.
patent: 4320398 (1982-03-01), Fritzlen
patent: 4616352 (1986-10-01), Sallas et al.
patent: 4670863 (1987-06-01), Sallas et al.
Geophysical Prospecting, vol. 29, #2, pp. 178-188, 4/81, by Reitsch, E., abstract only provided.

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