US 9,810,626 B2
Optoelectronic sensor and method for the transmission monitoring of a front screen
Joachim Kramer, Waldkirch (DE); Michael Engler, Waldkirch (DE); Markus Hammes, Waldkirch (DE); and Christof J. Meyer, Waldkirch (DE)
Assigned to SICK AG, Waldkirch (DE)
Filed by SICK AG, Waldkirch (DE)
Filed on Apr. 7, 2016, as Appl. No. 15/92,991.
Claims priority of application No. 10 2015 105 264 (DE), filed on Apr. 8, 2015.
Prior Publication US 2016/0299072 A1, Oct. 13, 2016
Int. Cl. G01N 21/59 (2006.01); G01S 17/42 (2006.01); G01S 7/481 (2006.01); G01S 7/497 (2006.01); G01D 5/30 (2006.01); G01M 11/00 (2006.01)
CPC G01N 21/59 (2013.01) [G01D 5/30 (2013.01); G01M 11/00 (2013.01); G01S 7/4817 (2013.01); G01S 7/497 (2013.01); G01S 17/42 (2013.01); G01N 2201/06113 (2013.01); G01N 2201/1053 (2013.01); G01S 2007/4975 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optoelectronic sensor for detecting objects in a monitored zone, said optoelectronic sensor having the following:
a front screen;
a light transmitter for transmitting a light beam;
a movable deflection unit for a periodic sampling of the monitored zone by the light beam;
a light receiver for generating a received signal from the light beam remitted by the objects;
at least one test light transmitter, at least one test light receiver and at least one test light reflector which span a test light path through the front screen;
and an evaluation unit which is configured to acquire pieces of information on the objects present in the monitored zone from the received signal and to recognize an impaired light permeability of the front screen from a test light signal which the test light receiver generates from test light which is transmitted from the test light transmitter and which is reflected at the test light reflector,
wherein the test light reflector is arranged such that it moves along with the deflection unit.