Technology That Uses Light to Measure Powder Size – Why Measure Particle Diameter? To What Point Can It Be Measured? –

By: Satoru TANAKA, Satoko ISHIHARA, Yoko SHINOZAKI, Kyoko MITSUNARI, Makoto OHISHI

24 November 2013


The Japanese character for “powder” is made up of two parts that mean “separate” and “rice”. Originally, grains like rice were crushed into small pieces. There are many types of powder around us, not limited to the “powder” that referred to crushed grains a long time ago. Some types of powder are suspended powders that are deemed to be harmful, such as fine particulate matter 2.5 (PM2.5). More familiar types of powder would be in the form of medicine or food. We get benefits from many types of powders in our daily lives, from flour to home appliances and even space-related technologies.

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