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Ice detector circuit

  • US 4,980,673 A
  • Filed: 06/10/1987
  • Issued: 12/25/1990
  • Est. Priority Date: 06/10/1987
  • Status: Expired due to Fees
First Claim
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1. An ice detector circuit for sensing an ice deposition on a sensing surface of an ice detector probe from an air mass moving relative thereto, the probe including heating means for heating the sensing surface to melt the ice deposition and sensing means for providing a sensor output having a level varying as a function of a temperature of the sensing surface, the circuit comprising:

  • controller means coupled to the heating means for selectively energizing the heating means;

    timing means coupled to the sensing means for providing a timing output representative of at least one interval of time elapsed between selected sensor output levels while the sensing surface is affected by heat from the heating means; and

    computing means coupled to the timing means, said computing means having a conversion value representation of a predetermined relationship between the ice deposition and the elapsed time represented by the timing output, for providing an output representative of ice deposition on the sensing surface.

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