Laser Photo-Acoustic Spectroscopy (LPAS) can be used to obtain a spectrum of dried herbs and then classification models can be built to detect adulteration. It is analogous in this way to conventional Infra-Red spectroscopy. The advantage of LPAS is the power of the source; a laser, vs a lamp. In this publication (a preprint, not yet peer-reviewed) the authors report the development of an LPAS system trained and calibrated to detect olive leaf adulteration in oregano down to 20% and ideal for in-line use in an industrial setting.
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