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1. (WO2018078381) DETECTION OF PH

Pub. No.:    WO/2018/078381    International Application No.:    PCT/GB2017/053241
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Sat Oct 28 01:59:59 CEST 2017
IPC: G01N 21/65
Applicants: UNITED KINGDOM RESEARCH AND INNOVATION
Inventors: MATOUSEK, Pavel
STONE, Nicholas
GARDNER, Benjamin
Title: DETECTION OF PH
Abstract:
We disclose methods and apparatus for measuring pH in a sub-surface volume of a diffusely scattering sample. Probe light is directed to an entry region on the sample surface, and collected from a collection region on the sample surface following diffuse scattering within the sample. The collection region is spatially offset from the entry region, so that when one or more Raman spectral features are detected in the collected probe light, a pH of the subsurface volume can be determined from the spectral features.