Patent ID: 6776037
Filing Date: 2004-08-17
Classification: B64D,G01F

Abstract:
An apparatus for accurately determining the level in a liquid container, or the presence of ice on a surface, said apparatus comprising:a first layer material comprising of an alloy strip secured along the longitudinal extent of the face of an elongated substrate or plastic sheet; a plurality of metallic pads secured to said substrate, each pad having one end electrically connected to said alloy strap to form a plurality of thermocouples, said thermocouples being spaced apart over the longitudinal extent of said alloy constantan strip; a second layer material comprising of a thin dielectric film secured to said substrate covering said thermocouples for electrically isolating said thermocouples from air or liquid; means for applying electrical power to said alloy strip, controlled by a power control switch, wherein both ends of said alloy strip are connected to said electrical power applying means for heating by electrical pulses of said alloy strip; display means for indicating the liquid level in said liquid container; a data acquisition system comprising, analog and digital circuitry, a microprocessor, and display means for indicating said liquid level from temperatures sensed by said thermocouples.