Method for determining absolute reflectance of a material in the ultraviolet range

  • US RE34,783 E
  • Filed: 08/23/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 02/01/1990
  • Status: Expired due to Term
First Claim
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1. A method for determining an absolute reflectance of material from a microscopic measurement of its measured reflectance in the ultraviolet radiation range, said method comprising the steps of:

  • determining a value of absolute reflectance of a known material at a predetermined wavelength;

    measuring the reflectance of said known material to obtain a value of measured reflectance with a microscope illuminated with radiation at said predetermined wavelength;

    with said values of absolute reflectance and measured reflectance, calculating an efficiency coefficient representing all absorption and losses caused by the microscope optical system, its reflectance detectors and its illumination system at said predetermined wavelength;

    measuring the reflectance of an unknown material to obtain a second value of measured reflectance with said microscope illuminated with said radiation at said predetermined wavelength;

    applying said efficiency coefficient to said second value of measured reflectance to obtain a value of absolute reflectance of said unknown material.

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