Using the Lambert-Beer law for thickness evaluation of photoconductor coatings for recording holograms

An experimental study on geometrical thickness measurements of photoconductor polymer coatings on thermoplastic polyester film substrate used as commercially available recording holograms is reported. The bases of these measurements which enable the evaluation of both total and coating thicknesses are the interference visible and infrared absorption spectra and the absorbance value of a band caused by the photoconductor coating in the infrared spectrum. A new technique, based on the Lambert-Beer law is proposed in order to obtain the thickness measurement of the coating.