Patent ID: 7495202
Filing Date: 2009-02-24
Classification: G01S,H01L

Abstract:
1. A device for detecting electromagnetic radiation, comprising a receiver which outputs an output signal in dependence on the electromagnetic radiation; a means for varying a sensitivity of the receiver; an energy store which is connectable to the receiver and whose stored energy is changed, in a connected state, in accordance with the output signal; and a control means for periodically resetting the energy store to a predetermined reference energy value, and for controlling the means for varying the sensitivity such that between two successive resetting events the sensitivity is high at least once and is low at least once, a state of the energy store giving an indication of the electromagnetic radiation, wherein the electromagnetic radiation is pulsed, and wherein the control means is configured to control the means for varying such that between two successive resetting events, the sensitivity is switched between high and low sensitivity, and that the switching is synchronized with pulse time periods during which the electromagnetic radiation is emitted.