Inductively coupled underwater modem
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 7, 2001
Issued Date -
N/A
app pub date -
May 1, 1995
filing date -
Mar 14, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a subsurface instrument and a system for the collection and transmission of deep ocean data utilizing standard buoy mooring lines. The system includes a moored surface buoy and a submerged data collection instrument both inductively coupled to the buoy cable. The instrument has a transducer responsive to the characteristics of seawater. A slave modem is interconnected to the transducer through an A/D converter allowing analog transducer signals to be converted to standard telephone modem signals. The modem signals are inductively coupled into the mooring cable and received by a master modem located in the buoy. The buoy may contain a satellite transceiver allowing transmission of the signals to a remote location. The subsurface instrument is battery powered and battery life is extended by powering down when the instrument is not in use. Upon receipt of a signal from the master modem or an internal timer, a wake-up circuit in the instrument is activated causing the transmission of ocean data to be initiated.
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