Title:
ICE CUMULATIVE RATE INDICATOR
Document Type and Number:
Japanese Patent JPS5263781
Kind Code:
A
Abstract:
Apparatus for indicating the rate of ice accretion on a surface particularly for use in aircraft comprising a hollow housing divided internally by a resilient diaphragm into first and second chambers. A first conduit communication at one end with a gas supply and terminating at its other end in a first orifice. Intermediate the ends of the first conduit is a first restrictor and the first chamber of the housing communicates with the first conduit intermediate the first orifice and the first restrictor. Movable relative to the first orifice is a test surface upon which ice can form in use. The test surface is in use moved at a known speed and at a constant spacing from the first orifice. A second conduit communicates at one end with the gas supply and at its other end terminates in a second orifice. Intermediate the ends of the second conduit is a second restrictor and the second restrictor is variable, the setting thereof being determined by the position of the diaphragm in the housing. The second chamber of the housing communicates with the second conduit between the second restrictor and the second orifice and associated with the diaphragm is a proximity sensor for supplying a signal representative of the position of the diaphragm to a visual indicator. The second restrictor is arranged to effect a decrease in the restriction in the second conduit as the diaphragm moves in a direction to reduce the volume of the second chamber.
Inventors:
JIYOFUREI EJINTON
Application Number:
JP13785076A
Publication Date:
May 26, 1977
Filing Date:
November 18, 1976
Export Citation:
Assignee:
LUCAS INDUSTRIES LTD
International Classes:
G01N7/00; B64D15/20; G01B13/06; G01W1/14; (IPC1-7): G01W1/00