Determining dirtiness of items to be washed by domestic device involves detecting reflected/transmitted electromagnetic radiation with wavelengths absorbed by impurities on items

摘要

The method involves using electromagnetic radiation containing wavelengths absorbed by impurities on the surface of the items (30) to be cleaned. The radiation reflected and/or transmitted by the items is measured and used to draw conclusions about the type and quantity of impurities on the items. Independent claims are also included for the following: a dishwasher.