Blended optical methods. There are actually a variety of proprietary optical smoke measurement products such as the 'nephelometer' or perhaps the 'aethalometer' which use several distinct optical methods, including more than one wavelength of light, inside one instrument and apply an algorithm to provide a fantastic estimate of smoke. https://nuso89011.empirewiki.com/8741874/cigarettes_an_overview
Smoke Fundamentals Explained
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