Geosensor Corporation

Geosource, Inc.

Halliburton Geophysical Services, Inc.

Gary J Craig

John L Maida

Louis W Erath

John Luscombe

Malcolm Paul Varnham

Algernon S Badger

Ed Kluth

A seismic sensor array includes a means for passive electrical to optical energy transformation and transmission. This transformation is used remotely with traditional sensor arrays, which may include hydrophones, geophones, or a combination of them. The transformation means is used to develop an optical signal in a fiber which then conveys the seismic signals to a recording center or data accumulator.

Seismic sensor array with electrical to optical transformers

A seismic sensor array includes a means for passive electrical to optical energy transformation and transmission. This transformation is used remotely with traditional sensor arrays, which may include hydrophones, geophones, or a combination of them. The transformation means is used to develop an optical signal in a fiber which then conveys the seismic signals to a recording center or data accumulator. The transformation means preferably comprises a stack of piezoelectric elements capped on each end by a rounded crown to accommodate an optical fiber wound around the stack and the crowns.

Seismic sensor array with electrical-to optical transformers

An element that is sensitive to a pressure or acceleration signal comprises an optical element capable of changing its index of refraction and/or path length in response to a time varying pressure or in response to acceleration and a pliant mounting member supporting the optical element. The mounting member changes its geometrical configuration in response to the time varying pressure or acceleration. Some embodiments of the invention use a mechanical amplifier to achieve the needed sensitivity.

Optical sensor

A method for precisely adjusting the sensitivity of a polarized crystal hydrophone by applying a voltage signal to the hydrophone. Voltage pulses having selected characteristics are repeatedly applied to the crystal until it is determined that the sensitivity of the crystal has reached a desired level.

Method for adjusting crystal hydrophone output

An apparatus and method for testing a geophone during assembly is disclosed. The apparatus includes a light source cooperating with a photocell for generating a voltage signal in response to light. A member for support of the geophone to be tested is located in a defined path between the light source and the photocell for generating a voltage signal. The apparatus further includes a display unit for indicating the voltage signal generated, which is representative of the resilient characteristics of the geophone springs, characterizing the position of the geophone coil and its resonant frequency.

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Houston, TX, United States of America

Gary J Craig