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Near-infrared techniques for LPG quality control

The analysis of the composition of liquified petroleum gases (LPG) is currently carried out by gas chromatography. This method is accurate, but is expensive and is not suitable for use in field portable instruments. In this work we show that there is sufficient information in the near infrared absorption spectra to allow the main components of LPG to be distinguished. Classical spectroscopic methods can be used for this, but currently there are no near infrared spectrometers available suitable for use in a low cost portable instrument. Nor is it clear how such detailed spectroscopic data should be used to yield an LPG quality factor. We show how a chromatic system based ont three broad band detectors may be used as a low cost robust method of quality control of LPG products.