Axially Perpendicular Offset Raman Scheme for Reproducible Measurement of Housed Samples in a Noncircular Container under Variation of Container Orientation

Abstract

An axially perpendicular of et (APO) scheme that is able to directly acquire reproducible Raman spectra of samples contained in an oval container under variation of container orientation has been demonstrated. This scheme utilized an axially perpendicular geometry between the laser illumination and the Raman photon detection, namely, irradiation through a sidewall of the container and gathering of the Raman photon just beneath the container. In the case of either backscattering or transmission measurements, Raman sampling volumes for an internal sample vary when the orientation of an oval container changes