Abstract: The invention relates to a test method for testing the operability of an optical sensor for monitoring a monitored zone in which at least one test object is used which is located in a detection zone of the sensor including the monitored zone. Provision is made in accordance with the invention that the test object is changed during the carrying out of the test method with respect to its position, alignment or its optical properties and produces a test signal when the change cannot be detected in the expected manner. The invention further relates to an optical sensor for monitoring a monitored zone, wherein the test method in accordance with the invention can be used.

Abstract: The invention relates to an optical sensor for monitoring a monitored zone having a detection device for observing a detection zone including the monitored zone, said detection device including a transmission device for transmitting transmission light into the detection zone and a receiver for receiving light reflected back or remitted back from the detection zone or transmitted through the detection zone and having at least one test object within the detection zone of the optical sensor. In accordance with the invention, the optical sensor has a device for avoiding and/or eliminating the contamination of the at least on test object.

Abstract: A triangulation light sensor includes at least one light transmitter for transmitting a light signal into a detection zone, a light receiver having a plurality of receiver elements for receiving light from the detection zone reflected diffusely and/or specularly, and a reception optics arranged between the detection zone and the light receiver in the beam path, with the position of a light spot produced on the light receiver in a triangulation direction by the reflected light resulting in dependence on the distance of the object. The reception optics includes at least one multisegmented lens element having a plurality of lens segments with mutually spaced apart optical axes in the triangulation direction and at least one freeform lens element or one diffractive-optical element having a multisegmented lens element having a plurality of lens segments with optical axes spaced apart from one another in the triangulation direction.

Abstract: An optoelectronic sensor (10) has a light receiver (16) for converting received light from a detection area (12) into an electrical signal. The sensor (10) comprises an evaluation unit (18) for obtaining information about objects in the detection area (12) from the electrical signal and aiming means (22) having at least one light source (24) and a pattern generating element (28) to make the detection area (12) visible with a light pattern (36). The pattern generating element (28) comprises a plurality of cylindrical lenses (30, 32, 34) so that the generated light pattern (36) comprises a plurality of lines (38) showing the position of the detection area (12).

Abstract: A mobile data memory which is designed such that it can be used in an intrinsically safe manner in explosion-prone areas includes a memory device which has a first interface and a second interface for data exchange, wherein the second interface is designed in an intrinsically safe manner and for data exchange with a device, in particular with a sensor, and the first interface is designed for data exchange with data processing equipment, in particular for data evaluation.