About: http://webisa.webdatacommons.org/97196669

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, when substances such as dry sand or earth, or moist fiber, earth or sand have adhered to the cover, the light used in the sensor is blocked by the adhering substance, thereby deteriorating the sensitivity of the sensor.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com