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