基本信息
摘要：1,080,113. Infrared analysis. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. May 25, 1965 [May 28, 1964], No. 22116/65. Heading G1A. Powdered material is analyzed by bringing it into contact with the surface of a light guide, passing infrared radiation through the guide to make an angle greater than the critical angle with said surface and spectrally analyzing the light internally reflected from the surface. Since internally reflected light penetrates about one wavelength beyond the reflecting interface, it is subject to absorption by the powder, and spectral analysis of the light produces the usual infrared absorption spectrum for the powdered substance. The light guide may be a slab of Ge, Si or AgCl. A two beam system in which radiation from a source is switched to fall on a detector alternately directly and through the light guide may be used. Cigarette smoke may be analyzed by passing it into a chamber 11 where the smoke particles are given a positive charge by a corona discharge between electrodes 12 and 13 and deposited on the surface of the light guide 3 which is rotated by a motor M.
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