An interference-radiation-compensated device for measuring an optical signal transmission path during a plurality of intermittently successive measurement intervals, particularly for detection of an object and/or for detection of a movement and/or movement direction of an object, comprising - at least one measurement transmitter (H1,H2,H3) for transmitting an optical measurement signal, - at least one receiver for receiving an optical signal, wherein the at least one receiver is exposed to interference radiation e.g. from the ambience, - a controlling and evaluating unit operative to control the least one measurement transmitter (H1,H2,H3) and the at least one receiver for transmitting and respectively receiving an optical signal during the measurement phase of a measurement interval and for evaluating the received optical measurement signal by processing an electric signal at a first node (61,62), which is electrically coupled to the at least one receiver, and amplified by means of a measurement amplifier (18, 19), and - at least one first interference-radiation compensation unit (26,27,28,29) coupled to the first node (61,62), for electrically biasing the at least one receiver by providing a first compensation current of an amount substantially identical to the amount of an interference signal generated as a result of the interference radiation from the at least one receiver, characterized by - a functional unit for transferring the at least one measurement transmitter (H1,H2,H3) and the at least one first interference-radiation compensation unit (26,27,28,29) to a power saving mode in which only the functional unit and a system oscillator are active and the at least one measurement transmitter (H1,H2,H3) and the at least one first interference-radiation compensation unit (26,27,28,29) are switched off. - at least one measurement transmitter (H1,H2,H3) for transmitting an optical measurement signal, - at least one receiver for receiving an optical signal, wherein the at least one receiver is exposed to interference radiation e.g. from the ambience, - a controlling and evaluating unit operative to control the least one measurement transmitter (H1,H2,H3) and the at least one receiver for transmitting and respectively receiving an optical signal during the measurement phase of a measurement interval and for evaluating the received optical measurement signal by processing an electric signal at a first node (61,62), which is electrically coupled to the at least one receiver, and amplified by means of a measurement amplifier (18, 19), and - at least one first interference-radiation compensation unit (26,27,28,29) coupled to the first node (61,62), for electrically biasing the at least one receiver by providing a first compensation current of an amount substantially identical to the amount of an interference signal generated as a result of the interference radiation from the at least one receiver, - a functional unit for transferring the at least one measurement transmitter (H1,H2,H3) and the at least one first interference-radiation compensation unit (26,27,28,29) to a power saving mode in which only the functional unit and a system oscillator are active and the at least one measurement transmitter (H1,H2,H3) and the at least one first interference-radiation compensation unit (26,27,28,29) are switched off.