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Icing Onset Sensor
 The
Icing Onset Sensor is a thin film capacitive-based sensor that monitors
airfoil icing. The sensor identifies two levels of icing conditions. A
"Trace" light alerts the pilot when a trace of ice has formed on the airfoil.
An "Ice" light warns that ice formation has grown to a thickness that
can be verified by the pilot.
The system provides an indicator light test, a power-up self test, and
a continuous built-in self-test to determine that the sensor element and
detection circuits are working properly.
The sensor element consists of a copper electrode pattern embedded in
a polyimide laminate. This laminate is bonded to the host airfoil.
A small electric field is set up on the exposed surface of the sensor.
The presence of ice on the sensor surface alters the field characteristics
which are monitored by the sensor electrodes. The sensing region measures
1.5 inches chord-wise x 4.5 inches span-wise. In custom applications these
dimensions are tailored in accordance with the leading edge curvature,
angles of attack, and icing prone region.
The electronics package contains the circuitry that monitors and interprets
the electric field signals. The 4 x 7 x 2 inch electronics package can
be located remotely from the sensor element and is connected to the sensor
element via small coaxial cables.
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SPECIFICATIONS
Electronics
Dimensions 4 x 7 x 2"
Cockpit Display
Dimensions 1.1 x 3.5"
Three indicator lights
Trace
Ice
Error
Push-button light test
Ice Sensor
Thickness 0.030 inches
Overall dimensions 2.5 x 5.5 inches
Sense area dimensions 1.5 x 4.5 inches
System
Power 0.180 amp 28V
Weight 1 lbs
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