Publication
Review of Scientific Instruments
Paper

Oscillating beam spectrometer

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Abstract

A sensitive visible spectrometer has been designed to detect very small differences in the transmission or the reflection of two adjacent areas of a substrate. A probing light beam of variable wavelength is deflected between the two areas by a galvanometer-type oscillating mirror in order to obtain a differential absorption or reflection. The absorption spectra of a dye incorporated in a Langmuir film, a monolayer of dye molecules covalently bonded to glass and molecules oriented in a stretched polyethylene film are presented as examples. The modification of the instrument to cover the near UV and IR regions is straightforward and will be discussed.

Date

22 Jul 2008

Publication

Review of Scientific Instruments

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