Patent ID: 8280102
Filing Date: 2012-10-02
Classification: G01V,G08C,H04Q

Abstract:
1. A device for controlling a driven movement element with an electronic unit, which comprises: a transmitter for emitting electromagnetic radiation and a receiver for receiving electromagnetic radiation emitted by the transmitter for the detection of objects on a propagation path between the transmitter and the receiver, wherein a person who moves into the propagation path of the light is detectable; wherein the electronic unit detects a temporal change in at least one feature derived from the electromagnetic radiation received by the receiver and, upon a detection of a change in the at least one feature outputs a signal that is associated with a detection of smoke; wherein the electronic unit performs, in a predefined time, a plurality of measurements of a feature that is representative of the intensity of the received electromagnetic radiation; and wherein the electronic unit determined the time from the instant at which the feature that is representative of the intensity exceeds a first threshold from the top downward to the instant at which the feature that is representative of the intensity exceeds a second, lower threshold from the top downward.