Honeywell G.m.b.h.

Tetra Tech, Inc.

Steve W Braun

Henri Hodara

Richard M Romley

A distributed geophone data acquisition system is disclosed that includes a receiver for the geophone data and a plurality of data cables connected together and to the receiver at one end. The cables have a plurality of twisted pairs of electrical conductor channels and two fiber optic light guides. Multiple geophone takeouts are connected to separate channels of the cables. Remote data units are connected between adjacent ends of each data cable that convert the geophone signals on each channel to light signals for transmitting through the fiber optic light guide of the next cable to the next remote data unit and ultimately to the receiver.

Fiber optic seismic system

Disclosed is a direction sensing apparatus employed with universal connectors at the data units located along a data transmission cable. Each connector includes an optical source and an optical detector and the connecting segments cable between units each includes two fiberoptic conduits. One is for the transmission of control signals in a direction away from a master station and the other is for the transmission of the data signals toward the master station. Logic circuitry within each unit determines the presence of the first light source detected at the unit and switches the signals modulated thereon to the command channel within the unit. This switching also applies the signals modulated on the second-in-time light source detected at the unit to be applied to the data channel within the unit. Hence, it makes no difference which of the two connections at each data unit is used for connecting with the preceding station or with the succeeding station.

Direction sensing apparatus for data transmission cable connections

A pressure compensated, fiber optic coupler for use underwater includes a water impermeable housing have first and second apertures to receive the respective optical fibers. One fiber is permanently held by the seal to the first aperture. The other fiber is inserted through the second aperture which is sealed by a conformable seal which is biased closed when no fiber is inserted through it. An incompressible, refraction of index matched fluid fills the interior of the housing to provide pressure compensation. The conformable seal is conveniently constructed of flexible neoprene and the housing is preferably titanium.

Optical fiber connector for high pressure environments

Disclosed is an instantaneous floating point amplifier which continuously generates an offset correction voltage level for each possible gain word controlling an internal cascaded amplifier. The offset voltage levels are digitized and stored until an input data signal is received. A portion of the output analog-to-digital converter system for the floating point amplifier is utilized on a time sharing basis to regenerate an analog offset correction voltage. The offset correction voltage is input into a summing network inserted into the amplifier circuit between internal preamplifier and amplifier components. When the input signal has been grounded, the offset correction voltage is disconnected from the input summing network and the floating point amplifier is cycled through its gain operations.

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San Diego, CA, United States of America

Steve W Braun