An interference-radiation-compensated device for measuring an optical signal transmission path during a plurality of intermittently successive measurement intervals with measurement pauses between the measurement intervals, particularly for detection of an object and/or 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 driving and evaluating unit operative to drive 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 evaluation of the received optical measurement signal by processing an electric signal at a first node (61,62) coupled to the at least one receiver, 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, - wherein the at least one first interference-radiation compensation unit (26,27,28,29) comprises a variable internal resistance, characterized in - that the driving and evaluating unit is operative, for the purpose of setting a compensation current that is performed during a first preparation phase of a measurement interval prior to its measurement phase, the compensation current being substantially equal to the interference signal supplied by the receiver due to the current interference signal, to set the inner resistance of the least one first interference-radiation compensation unit (26,27,28,29) to a lower first resistance value for the duration of the preparation phase and, for maintaining the compensation current as required during the measurement phase, to set said inner resistance to a higher second resistance value for the duration of the measurement phase. - 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 driving and evaluating unit operative to drive 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 evaluation of the received optical measurement signal by processing an electric signal at a first node (61,62) coupled to the at least one receiver, 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, - wherein the at least one first interference-radiation compensation unit (26,27,28,29) comprises a variable internal resistance, - that the driving and evaluating unit is operative, for the purpose of setting a compensation current that is performed during a first preparation phase of a measurement interval prior to its measurement phase, the compensation current being substantially equal to the interference signal supplied by the receiver due to the current interference signal, to set the inner resistance of the least one first interference-radiation compensation unit (26,27,28,29) to a lower first resistance value for the duration of the preparation phase and, for maintaining the compensation current as required during the measurement phase, to set said inner resistance to a higher second resistance value for the duration of the measurement phase.