| 摘要 |
<p>Process for generating and detecting colours and optical spectra on moving and stationary media, having a radiation device comprising at least two, preferably three, semiconductor radiators, preferably LEDs or IREDs or lasers, which simultaneously irradiate a common surface or a single measuring point of a medium with an optical radiation of different wavelengths, from UV via VIS to IR, with an adequately different modulation frequency assigned to the radiation, the radiation being guided and combined by optical means onto a single point, and the reflected or transmitted radiation being sensed by a receiver adapted to the emitted radiation, having a downstream electronic evaluation device which either uses a simple system of demodulators in the form of narrow-band filters to transmit only the electric pulses which are assigned to the respective radiation wavelength and are available at the receiver or uses a synchronous demodulation determined by the transmitter to pass the simultaneously available different pulse frequencies to an evaluation unit, and the latter assigns the frequencies again to the known emitted modulations of the radiation wavelength, and also having an evaluation unit in the form of a rectifier circuit with smoothing and downstream A/D converter, in order in addition to the pulse frequency ... the level of the converted pulse value as a measure of the ... Original abstract incomplete. <IMAGE></p> |
