METHOD OF AND HAIR DRYER FOR DRYING HAIR USING REMOTE SENSING OF THE MOISTURE CONTENT OF THE HAIR

摘要

Hair dryer with remote sensing of the moistness of the air (10) by means of a detector (14) which compares the amount of radiant energy in two absorption bands in the spectrum of light emitted by an infrared source (12) and reflected by the hair. One of the absorption bands is caused by water in the hair. The amount of radiant energy in this absorption band changes significantly during the drying of the hair. The other absorption band is caused by keratin in the hair. The energy in this band changes to a much smaller extent during the drying of the hair. The intensity ratio of the two bands is an indicator for the moistness of the hair and can be employed to control the temperature and/or the air flow of the hair dryer.