| abstract |
A simple and still reliable detector for an accurate determination of a position of at least one object (112) in space is provided. The detector comprises a longitudinal optical sensor (114) having a stack of at least two individual pin diodes (130, 130') arranged between at least two electrodes (132, 132'). Upon illumination of the sensor region by an incident light beam (136), a longitudinal sensor signal is generated. The longitudinal sensor signal, given the same power of illumination, is dependent on a beam cross-section of the light beam (136). The at last two individual pin diodes (130, 130') have different spectral sensitivities in order to enable the determination of a distance between the object and the detector by light beams in different spectral ranges, e.g. by light beams in the visible spectral range and in the infrared spectral range. |