Abstract: A device for detecting quality alterations in bulk goods transported on moving belt conveyors comprising a pulsed, monochromatic light source (1), frequency multipliers (2) and dichroic mirrors (3) or prisms to simultaneously generate several light beams having different wavelengths and irradiate several spots (6) of the flow of bulk goods on the belt conveyor (7). In addition, a detector unit is provided for observing the irradiated spots (6) in the flow of bulk goods for measuring excited photoluminescence, reflected light and temperatures, as well as for carrying out signal analysis with time resolution. The triggering of the device is adapted to the running speed of the belt conveyor (7) and allows the same area of the moving flow of the bulk goods to be irradiated several times in the spots (6) with beams having different wavelengths. The signal analysis includes detecting signal intensity and the fading behaviour of the signals in defined spectral ranges.

Abstract: A device for detecting fluorescence on the surface of the earth is disclosed. The device includes a laser installed in a vehicle, means for irradiating an essentially linear surface area in front of and transverse to the vehicle, a directing device for directing the spread beam downward to illuminate the earth's surface and means for detecting fluorescence on the illuminated surface. The inventive device permits the rapid and effective exploration of a relatively large area without gaps of the earth's surface for fluorescent substances.