Abstract: A lighting source arrangement comprising a light conducting cable formed of an optical fibre consisting of a plurality of elementary fibres, a device for holding and fastening the optical fibre onto a supporting structure and means for steering the light beam issuing from the fibre, wherein said fastening device is a device for holding the optical fibre in a stationary position and the device for steering the light beam emitted by the fibre comprises at least one member for deviating the beam which is mounted rotatably about the axis of the optical fibre onto a stationary holder.

Abstract: A method of detecting a heat source in an area to be watched consists of disposing a detector on a support elevated with respect to the area to effect a sweeping motion at least in a horizontal plane. Points in the area to be watched are defined by the angular position of the detector in the horizontal and vertical planes when the detector is directed toward a point and by at least one associated additional data element that impounds the geographic position of the point in a predetermined reference system.

Abstract: A station for locating through laser rays an object likely to diffuse back a part of the incident laser ray, wherein the optical emitter and receiver devices consist of one single device comprising, in the direction of emission, a device for separating the emitted and retrodiffused rays, an optical device converting the emitted parallel beam of small diameter into a divergent beam and a telescope adapted to collimate the divergent beam received from the optical device into a parallel beam of larger diameter, the retrodiffused beam travelling that path in the direction reverse from the emitted beam, the invention being usable for detecting in particular forest fire smokes.

Abstract: The invention relates to a system for detecting sources of heat, comprising a certain number of watching stations distributed within the area to be watched, comprising an infrared radiation detector located at a level above the area to be watched and connected to a motor for imparting to the detector a periodic angular, step-by-step motion, and a device for logic processing of the information received by the detector and for transmission through the telephone link, a central station being equipped with a data processing device including a memory in which the known sources of heat of the area to be watched are recorded or entered.