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Underground storage tank monitoring system and method

  • US 6,374,187 B1
  • Filed: 03/19/1999
  • Issued: 04/16/2002
  • Est. Priority Date: 03/19/1999
  • Status: Expired due to Fees
First Claim
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1. A liquid storage tank monitoring system which monitors liquid level in a plurality of storage tanks, comprising:

  • a) a plurality of micropower impulse radar probes, each of which is installed in a respective one of said tanks, each of said probes being operative to transmit micropower radar impulses toward the surface of liquid contained in their respective tank, to receive reflected micropower radar impulses returning from said liquid surface, and to calculate a liquid level information from the time lapse between transmission of the impulses and reception of the reflected impulses;

    b) a like plurality of spread spectrum transmitters and antennas, with each such transmitter being coupled to a respective one of said probes, each said transmitter receiving said liquid level information from the probe coupled thereto and being operative to encode and transmit said liquid level information;

    c) at least one spread spectrum receiver positioned in a location in which it can reliably receive and decode liquid level information transmitted by said spread spectrum transmitters and antennas; and

    d) a respective processor connected to each said receiver to receive and store said liquid level information.

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