Abstract: A device and installation are provided for the instantaneous and simultaneous detection, inside and outside, of radiations emitted in the infrared, visible and ultraviolet spectra by simultaneous physical phenomena having a character of risk, such as intrusion, fire, explosion, leaks of dangerous fluids and electric leaks, disturbances and absence of movement of a regular periodic phemonenon, said radiations being emitted, directly by the phenmonena to be monitored at the time when the risk appears or being caused artifically by directing over an appropriate field of view, in which take place said phemonena, a source of radiation comprised in the infrared, visible and ultraviolet, and adapted to the nature of the phemonena involved, said field of view covered by the detection device having appropriate horizontal and vertical dimensions comprising at least one spectral correction filter known pass band chosen as a function of the nature of the radiation, a linear or circular polarization filter, a microprism a