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Method and device for detecting soiling

  • US 8,334,972 B2
  • Filed: 09/07/2010
  • Issued: 12/18/2012
  • Est. Priority Date: 09/07/2009
  • Status: Active Grant
First Claim
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1. A device for detecting soiling comprising:

  • a light source which emits a light beam;

    a layer having a first boundary surface and a second boundary surface,a receiver for receiving light scattered from said first and secondary boundary surface wherein the light beam emitted by the light source first impinges on the first boundary surface with a scattered portion of the light beam being scattered at the first boundary surface and received by said receiver as a reference signal and a second portion of the light beam passing through said layer and impinging on said second boundary and another scattered portion of the light beam scattered at said second boundary surface and received by said receiver as a measuring signal; and

    an evaluator for comparing the reference signal and the measuring signal to determine a measure of the soiling of the secondary boundary surface.

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