VOC DETECTIONS WITH OPTICAL SPECTROSCOPY

|Volatile organic compounds (VOCs or VOC) have received increasing attention recently. They are important Parameter index for air quality monitoring, and biomarkers for diseases diagnosis. For the gas sensor community, various detection technologies were explored not only to detect total VOCs, but also aim for sensor selectivity. Commercially available VOC sensors, such as metal oxide based or photoionization detectors, are suitable for total VOCs but lack of selectivity. With the advancement of optical spectroscopy, it provides a good solution for speci(cid:12)c VOC detections. In this review, various spectroscopy techniques are summarised focusing on increasing sensor selectivity and sensitivity. The techniques considered in the paper are, non-dispersive infrared, multi-pass cell spectroscopy, cavity enhanced absorption spectroscopy, photoacoustic spectroscopy and Fourier transform infrared spectroscopy. Each technique has its advantages and disadvantages, which are also discussed.