Electric control arrangement for use in object detecting system with high and low intensity light

摘要

The invention relates to an electric control arrangement intended for use with object detecting systems, which include, inter alia, a light source (2) intended for transmitting light beams in a direction in which an object (3) to be detected can be expected to appear, at least one receiver unit (4, 5) for receiving light beams reflected by a detected object, and electrical and/or electronic devices for evaluating and detecting the presence of the object in response to variations that occur in the received reflected light beams as a result of relative movement between the object (3) to be detected and light beams (2a) transmitted by the light source. It is proposed in accordance with the invention that the light source (2) is arranged to transmit the light beams with an intensity which can be varied in time, and that the receiver unit (4, 5) receiving the reflected light beams is controlled in a manner such that reception takes place under those time periods in which the light source (2) transmits light of high intensity and also during those time periods in which the light source (2) transmits light (2a) of low intensity.