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Please use this identifier to cite or link to this item: http://purl.org/purl/2441

Title: Photoacoustic studies on multilayer dielectric coatings
Authors: Annieta, Philip
Radhakrishnan, P
Nampoori, V P N
Vallabhan, C P G
Technology
Keywords: photoacoustic effects
multilayer dielectric coatings
Issue Date: 1993
Publisher: IOP
Abstract: Non-destructive testing d multilayer dielectric coatings (SiO2/TiO2 structure) has been carried out using the photoacoustic technique. This technique makes use d a 10 mW He-Ne laser, a photoacoustic cell and a lock-in amplifier. The chopped He-Ne laser beam is allowed to fall on the sample placed in a photoacoustic cell. The acoustic signals thus generated are detected using a microphone and the resulting output is processed by a lock-in amplifier. The amplitude and phase of the signals were measured as a function of the chopping frequency. Striking step-like variations are observed in me phase against frequency plot which dearly reveals the different layers present in the multilayer structure.
URI: http://dyuthi.cusat.ac.in/purl/2441
Appears in Collections:Dr.C P Girijavallabhan

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