Photothermal spectroscopy as a sensitive spectroscopic tool

Andrew C. Tam

doi:10.1117/12.44237

1 July 1991 Photothermal spectroscopy as a sensitive spectroscopic tool

Andrew C. Tam

Proceedings Volume 1435, Optical Methods for Ultrasensitive Detection and Analysis: Techniques and Applications; (1991) https://doi.org/10.1117/12.44237
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Photothermal spectroscopy has emerged as a popular spectroscopic technique over the past decade because it is convenient and sensitive. It is convenient since a wide range of samples of all phases from highly opaque, light- scattering or reflective to highly transparent materials can be measured to some level of accuracy over a broad spectral range with little or no sample preparation. It is sensitive since, in principle, it is a 'zero background' technique, unlike the tradition extinction technique to measure absorption. However, in practice, various sources of noises become significant when the absorption approaches the part-per-million level or below, and various considerations of noise suppression and signal enhancement are essential to exploit photothermal spectroscopy, in particular, photoacoustic spectroscopy and probe-beam deflection spectroscopy. The authors consider here the physical basis for signal generation and enhancement, as well as noise sources and reduction schemes for pulsed and continuous-modulated excitations. Examples of experimental techniques are given to illustrate the points

Citation Download Citation

Andrew C. Tam "Photothermal spectroscopy as a sensitive spectroscopic tool", Proc. SPIE 1435, Optical Methods for Ultrasensitive Detection and Analysis: Techniques and Applications, (1 July 1991); https://doi.org/10.1117/12.44237

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