| 摘要 |
<p>The device (1) has a light source (4) provided for emitting a pair of light beams (5) which emerge and re-enter through a concave surface. A test surface (3) is arranged in a transparent cover (2). A receiver (6) is provided for measuring radiation power of the light beams, where the light beams are imaged independently after re-entry of the light beams in an unsoiled surface. A raindrop (7) is situated on the test surface. A set of microstructures is arranged on the test surface. An independent claim is also included for a method for determining transparency of soiling.</p> |
