Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-12-29
1990-01-02
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
244134F, G08B 1902
Patent
active
048916285
ABSTRACT:
A matter sensing apparatus includes a piezoelectric transducer, having a face susceptible to matter accretions at a surface for which matter accretion detection is desired. The electrical circuit of the transducer is coupled in the feedback path of an amplifier to establish an oscillator that oscillates at frequencies determined by the resonant frequency of the transducer and the loading on its face. The oscillator signals are converted to binary signals and utilized with binary signals, provided by a thermostat, that a representative of temperatures above or below a selected temperature to provide signals indicative of whether ice or other matter has accredited on the surface.
REFERENCES:
patent: 4176524 (1979-12-01), Kamiyama et al.
patent: 4553137 (1985-11-01), Marxer et al.
patent: 4568922 (1986-02-01), Schuippert et al.
patent: 4570881 (1986-02-01), Lustenberger
patent: 4611492 (1986-09-01), Kousmann
patent: 4688185 (1987-08-01), Masenheim
Levine Seymour
Orsino Joseph A.
Scutch III Frank M.
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