About: http://webisa.webdatacommons.org/6756539

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	In this implementation, the sensor is an optical sensor (having an LED emitter and a phototransistor detector) whose optical axes converge at a distance of 3.5 millimeters from the sensor.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr