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Proceedings Paper

Spectroscopy By Photothermal Radiometry
Author(s): Svein Otto Kanstad; Per-Erik Nordal
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Paper Abstract

When a sample is illuminated by pulsewise radiation, the concurrent heating at the surface gives rise to a pulsating component in the specimen's thermal infrared reradiation. It appears possible to observe surface temperature oscillations as small as 10-4 - 10-6 K, using current technology in infrared detection; this corresponds to the absorption in less than a monolayer. With monochromatic irradiation, absorption spectra of opaque objects can be obtained; it also becomes possible to examine subsurface structures. We review briefly the background of photothermal radiometry, and we present some experimental results to demonstrate the technique's versatility, including some new results from studies of photosynthesis in live plants.

Paper Details

Date Published: 16 June 1983
PDF: 4 pages
Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); doi: 10.1117/12.934393
Show Author Affiliations
Svein Otto Kanstad, Laser and Applied Optics Laboratory (Norway)
Per-Erik Nordal, Laser and Applied Optics Laboratory (Norway)

Published in SPIE Proceedings Vol. 0369:
Max Born Centenary Conf
M. John Colles; D. William Swift, Editor(s)

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