ICE DETECTION

摘要

An apparatus for detecting ice accretion on a surface (2020) comprises an electromagnetic radiation source (2014) configured in use to be positioned adjacent the surface (2020) and a detector (2012) spaced apart from the electromagnetic radiation source. The electromagnetic radiation source (2014) is operable to project electromagnetic radiation (2018) across a portion of the surface (2020) and on to the detector (2012) such that ice accretion on the surface produces a shadow in the projected electromagnetic radiation impinging on the detector (2012).