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Deep Subsurface Raman Spectroscopy of Turbid Media by a Defocused Collection System

Volume 61, Number 10 (Oct. 2007) Page 1123-1127

Eliasson, C.; Claybourn, M.; Matousek, P.


A simple procedure for the recovery of deep subsurface Raman spectra in stratified turbid samples by defocusing a conventional Raman instrument is presented. The method is based on effects present with spatially offset Raman spectroscopy (SORS) and, although not as efficient as the standard SORS approach, it permits a simple way of recovering subsurface Raman spectra from less challenging samples. Demonstration of the effect is performed using a standard SORS device and a commercial Raman instrument on the noninvasive measurement of paracetamol tablets held within a nontransparent white plastic bottle.