G - Physics – 01 – B
Patent
G - Physics
01
B
340/139, 73/99
G01B 13/02 (2006.01) G08B 19/02 (2006.01)
Patent
CA 1053477
ABSTRACT OF THE DISCLOSURE Apparatus for indicating rate of ice accretion part- icularly for use in an aircraft, the apparatus including test surface on which ice forms in use. First and second gas conduits are supplied with gas from a common pressure regulator the inlet of which communicates with a gas supply. A control port of the regulator is supplied with a reference pressure signal and the regulator operates to maintain its outlet pressure at a pre- determined amount in excess of the reference pressure. Each of the first and second conduits includes a restrictor and each conduit terminates at its end remote from the regulator in an orifice. The first orifice is adjacent the test surface and a pressure difference sensor is associated with the first and second conduits to produce a signal dependent on the pressure difference at points between the orifice and restrictor of the two conduits. The pressure difference signal is applied to an indicator. A control conduit connects the control port of the regulator to the second conduit at a point which is intermediate the orifice and the restrictor of the second conduit so that the reference pressure for the regulator is derived from the second conduit between the restrictor and the orifice thereof. The test surface is moved relative to the first orifice at a predetermined speed and thus the first orifice will be restricted to an amount dependent upon the thickness of ice forming on the test surface. The difference in pressure sensed by the sensor is directly related to the thickness of the ice layer on the test surface, and since the test surface is moving at a predetermined speed then the indicator indicates the rate of ice accretion on the test surface.
253599
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