An optical sensor for measuring the optical reflection properties of an object and / or the transmission characteristics of a transmission path for the use in motor vehicle

摘要

The present invention relates to a method and a device for optical measurement of the optical a transmission path (i1, i2, i3, i4). A transmitter (h1) sends a first optical signal (s1) as a function of a transmission signal (s9) in a transmission path (i1, i2) in which it extends through the optical properties of the transmission path (i1, i2) to a second optical signal (s2) is modified. At the same time transmits this transmitter (h1) a third optical signal (s3) as a function of a transmission signal (s9) in a further transmission path (i3, i4), in which it to a fourth optical signal (s4) is modified. A respective receiver (d1, d2) converts of each of said optical signals (s2, s4) in each case to the receiver output signals (s0_A, S0_B) in order to. It is in each case followed by the multiplication of the respective receiver output signal (s0_A, S0_B) with the transmission signal (s9) in a respective the multiplier apparatus (m1_A, M1_B) to a respective (s3_A, S3_B). A switch switches on it will be explained in a function of a feedback signal (s8) between the between signals (s3_A, S3_B) in order, in order to provide a filter input signal (s4) to form. A filter (f1), which preferably is an integrator, filters out the filter input signal (s4) to a filter output signal (s5). It follows, preferably, the conversion to a discrete-value filter output signal (s6) and the multiplication with – 1 or in the case of a binary discrete-value filter output signal (s6) the inversion to the feedback signal (s8), which controls the switch. The value-discrete filter output signal (s6), for example, is the value. A scanning with the transmission signal (s9) is useful.