Appeal No. 1998-1600
Application No. 08/434,898
8. An inductive modem telemetry system for use in collecting data in
seawater, the system comprising:
an electrically insulated wire rope immersed in seawater;
a plurality of subsurface instruments removably attached to the wire
rope at preselected locations;
master modem means for inductively coupling a plurality of
subsurface instrument specific wake-up command signals to each
subsurface instrument through the wire rope with a return path through
the seawater;
a transducer in each subsurface instrument to generate a data signal
related to the data to be collected;
a slave modem in each subsurface instrument interconnected with the
transducer to generate modem encoded signals related to the data
signal, and receive modem encoded signals from the master modem;
an inductive coupler in each subsurface instrument enveloping the
wire rope and interconnected with the slave modem, the inductive
coupler constructed to induce and receive electrical signals in
accordance with the modem encoded signals in a signal path to the
master modem including substantially equal length path legs in the
wire rope and in the seawater;
switch means in each subsurface unit operable in a sleep mode for
reducing power consumption of the subsurface instrument by
removing power from the transducer and slave modem; and
a continuously powered wake-up detector in each subsurface
instrument for operating the switch means to apply power to the
transducer and the slave modem in response to the wake-up signal
specific to that subsurface instrument.
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