US 9,810,527 B2
Image detection system for detecting an object
Klemens Wehrle, Waldkirch (DE); and Long Lu, Waldkirch (DE)
Assigned to SICK AG, Waldkirch (DE)
Filed by SICK AG, Waldkirch (DE)
Filed on Jul. 8, 2015, as Appl. No. 14/793,864.
Claims priority of application No. 14176351 (EP), filed on Jul. 9, 2014.
Prior Publication US 2016/0010979 A1, Jan. 14, 2016
Int. Cl. G01B 11/24 (2006.01); G06K 9/20 (2006.01); G06K 7/10 (2006.01)
CPC G01B 11/24 (2013.01) [G06K 7/10732 (2013.01); G06K 9/2018 (2013.01); G06K 9/2027 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An image detection system for detecting an object comprising:
a defined detection zone allowing detection of the object moved through plural detection zones;
at least two lighting units for lighting the detection zone with a respective light beam, each lighting unit comprising a light source each lighting unit transmitting a light beam at a defined light wavelength and using different light wavelengths, so as to illuminate the object moving through the detection zone with at least one of the lighting units, wherein the light beams intersect and the intersecting lighting units associated with the intersecting light beams transmit the light beams at the different light wavelengths; and
at least two light reception units comprising a line scan camera for receiving light reflected at the object, wherein one respective lighting unit is associated with a light reception unit, wherein the lighting units each transmit their light beams at a defined light wavelength and the light reception units are configured to receive a respective defined light wavelength of the reflected light associated with them, wherein the one light reception unit receives a different light wavelength than the other light reception unit, the lighting units and light reception units defining the detection zone, illuminating the object with light in the detection zone at the defined wavelengths of the lighting units, and the light reception units detect light at the defined light wavelength reflected by the object, establishing reading zones for the lighting units and light receptions units as pairs, wherein each pair intersects at the object at different light wavelengths corresponding to the defined wavelengths of the lighting units and light reception units in the pair, with the respective light reception unit in each pair configured such that it can only receive the reflected light at the corresponding defined light wavelength of the lighting unit in that pair,
wherein the lighting units whose light beams intersect transmit light beams of different light wavelengths and the lighting units whose light beams do not intersect transmit light beams of the same light wavelengths.