Abstract
Absorption and penetration depth of infra-red radiation covering 0.8-2.5 micro-meter wave length has been established successfully in spectrographic way for city water at room temperature by means of transmittance measurements and precise analysis formulae concerned already etsablished by one of the authors. The view point of this paper is based on infra-red radiation heating of water.Special references are made to interference effects caused by forward going and successively reflected backward waves in the measured thin water film.Taking advantage of the above interference effects, water refraction index spectrum covering 0.8-2.5 micro-meter wave length has been found, and also the approximate one for 2.5-25. micro-meter has been given by means of a special reflection measurement.
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