Abstract: A multi-spectral optical imaging system comprising first and second facing, reflective surfaces defining a single optical axis, the first reflective surface being integrally formed on a single piece of metallic material, the single piece of metallic material having a central aperture through which the optical axis extends and a plurality of elongate rib members integrally formed thereon which define therebetween a plurality of openings communicating with the central aperture; and the second reflective surface having a focus on the optical axis, whereby radiation impinging on the first reflective surface is reflected therefrom towards the second reflective surface and further reflected from the second reflective surface towards the focus; scanning element associated with the second reflective surface for causing the second reflective surface to undergo scanning motion; beamsplitting element receiving radiation reflected from the second reflective surface; and plural detectors, each operating at a different opt

Abstract: An integrally-formed optical imaging system including at least two facing, reflective surfaces defining a single optical axis and formed on a single piece of material.

Abstract: The invention relates to a device for carrying out a repetitive scan of a sensor element according to predetermined parameters. The sensor element is attached to a permanent magnet with diametrically opposed poles resulting in an open magnetic circuit. A coil is provided around said magnet, through which a current is passed, of predetermined frequency and intensity, where means are provided for enabling the rotation of the magnet and the sensor attached thereto as a result of the interaction of the two magnetic fields. According to a preferred embodiment, the scan is controlled by signals originating from electrooptical sensing means arranged in closed loop with the current which is applied to the coil.