| 摘要 |
<p>A method and apparatus for detecting properties of reflective transparent surface coatings on a sheet of transparent material (12), such as a sheet of glass or a sheet of plastic material. One or more light beams (14) are directed at an angle to the surfaces of the material under test and the energy in surface reflections sensed. The presence and surface location of a surface coating is determined from the relative magnitudes of surface reflections of the light beam (16a, 16d). The type of coatings is determined from the magnitudes of reflections of the light beam. The type of coating is determined from the magnitudes of reflections from the surface coating of one or more different wavelength light beams. The surface coating may be, for example, a Low-E coating, or a metal or metal oxide coating left on a sheet of float glass.</p> |
