| 摘要 |
A detector (15) for detecting the presence of ice, water, mist, frost or other solids or liquids on a sensing surface (14) is provided. The sensing surface (14) is provided by a medium substantially transparent to electromagnetic radiation and solids or liquids are deposited on the surface. A transmitter directs radiation onto the surface and a receiver is responsive to radiation reflected from the surface. A discriminator circuit receives an output from the receiver and provides an output indicative of whether a solid or a liquid is present on the surface.
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