Combustion or Burning: A chemical reaction in which a material combines with oxygen with the creation of heat.
Smolder: burn slowly and without a flame
Combustion generally refers to a rapid oxidation accompanied by a "flame". Cigarettes primarily smolder.
To see both at the same time requires an IR camera with a wide dynamic or temperature range, able to see lower and higher temperatures at the same time with acceptable thermal resolution. Today's microbolometer based cameras have very wide temperature ranges and are well suited to this type of measurement. See http://www.flirthermography.com/english/Default.asp for a variety of infrared cameras that would fit your needs.
Gary Orlove
Infrared Training Center
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