We show that it is possible to identify the chemical composition of an aerosol by using Fourier-transform spectroscopy of backscattered mid-infrared light at a range of 0.2 m. An ultrafast mid-infrared optical parametric oscillator provides the illumination source for the measurement across a wavelength range from 3.2–3.55 μm containing characteristic optical absorption features for two different chemicals. Normalized detection sensitivity below 10 ppm m−1 Hz−1/2 is obtained.
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Maidment et al. (2016) studied this question.
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