Figgie International, Inc.

Wendy Power

Michael A Reed

Dominick J Frustaci

Izrail Tsals

Thomas P Hosmer

Gerald Larocque

Brenda Marchetti

A sensor apparatus is described that detects and indicates the quantity of cryogenic liquid in a Dewar container independent of the spatial orientation and physical motions acting on the Dewar container. The sensor apparatus comprises a first conductor, preferably positioned adjacent to the container inner shell wall and a second conductor comprising a plurality of axially spaced and concentric conductor bands mounted inside the container in a proximately spaced and a parallel relationship with respect to the first conductor. The second conductor bands divide the first conductor into zones that provide a plurality of distinct and separate capacitors. A computer measures the capacitance of each capacitor and compares the individual capacitance measurements to reference capacitance values corresponding to a known quantity of cryogenic fluid filled in the container at known angles of inclination. The sensor apparatus is also useful as a motion detector.

Method and apparatus for determining the quantity of a liquid in a

A sensor apparatus is described that detects and indicates the volume of cryogenic liquid in a Dewar container independent of the spatial orientation and physical motions acting on the Dewar container. The sensor apparatus comprises a first conductor, preferably positioned adjacent to the container inner shell wall and a second conductor comprising a plurality of axially spaced and concentric endless conductor bands mounted inside the container in a proximately spaced and a parallel relationship with respect to the first conductor. The second conductor bands divide the first conductor into zones that provide a plurality of distinct and separate capacitors. A computer measures the capacitance of each capacitor and compares the individual capacitance measurements to reference capacitance values corresponding to a known volume of cryogenic fluid filled in the container at known angles of inclination.

Method and apparatus for determining quantity of liquid in a container

A sensor apparatus is described that detects and indicates the quantity of cryogenic liquid in a Dewar container, independent of the spatial orientation and the physical motions acting on the container.

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Westford, MA, United States of America

Wendy Power