Process control using fibre optics and Fourier Transform Infrared (FT-IR) spectroscopy

E. K. Kemsley, R. H. Wilson

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


A process control system has been constructed using optical fibres interfaced to a Fourier Transform Infrared (FT-IR) spectrometer, to achieve remote spectroscopic analysis of food samples during processing. The multi-channel interface accommodates six fibres, allowing the sequential observation of up to six samples. Novel fibre-optic sampling cells have been constructed, including transmission and attenuated total reflectance (ATR) designs. Different fibre types have been evaluated, in particular plastic clad silica (PCS) and zirconium fluoride fibres. Processes investigated have included the dilution of fruit juice concentrate, and the addition of alcohol to fruit syrup. Suitable algorithms have been written which use the results of spectroscopic measurements to control and monitor the course of each process, by actuating devices such as valves and switches.

Original languageEnglish
Pages (from-to)222-223
Number of pages2
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Mar 1991
Externally publishedYes
Event8th International Conference on Fourier Transform Spectroscopy 1991 - Lubeck-Travemunde, Germany
Duration: 1 Sep 19916 Sep 1991

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