Reduction of Convective Low-Frequency Noise in Thermal Lens Spectrometry

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The construction and optimization of a thermal lens spectrometer with coaxial pump/probe configuration is reported. The low-frequency noise of convective origin is studied in detail, and it is demonstrated that a horizontal slit, instead of a pinhole, can be used as a simple way of reducing the noise to a negligible level without losing sensitivity.

Keywords: Convective noise; Photothermal spectrometry; Thermal lens spectrometry

Document Type: Research Article


Affiliations: Department of Analytical Chemistry, University of Valencia, 46100 Burjassot, Valencia, Spain

Publication date: November 1, 1990

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