Abstract: A Schiefspiegler telescope with three reflecting surfaces, preferably for observing the earth from space, particularly for imaging radiometers. A novel possibility for realizing a reflector telescope without vignetting which permits a simple construction and a simple adjustment of the reflecting surfaces relative to one another. In a Schiefspiegler telescope with three reflecting surfaces whose mirror axes are arranged within a plane, the primary reflecting surface and tertiary reflecting surface are convex surfaces of identical shape arranged symmetrically with respect to an axis of symmetry. The secondary reflecting surface is arranged symmetric to the primary reflecting surface and tertiary reflecting surface so as to be rotationally symmetric around the axis of symmetry so that all three reflecting surfaces have an axially symmetric mirror arrangement with respect to design in which the optical imaging is transmitted to a receiver in the manner of an off-axis telescope.

Abstract: The invention is directed to a Schiefspiegler telescope with three reflecting surfaces, preferably for observing the earth from space, particularly for imaging radiometers. It is the object of the invention to find a novel possibility for realizing a reflector telescope without vignetting which permits a simple construction and a simple adjustment of the reflecting surfaces relative to one another.

Abstract: An arrangement for the detection of the fluorescence radiation of matrix-shaped specimen carriers with a large number of individual specimens, in particular, for the analysis of chemical and biological specimen carriers is disclosed.

Abstract: An arrangement is disclosed for optically reading out the information from substrates having a multiplicity of individual samples, in particular for analyzing chemical and biological sample carriers. The arrangement presents a new possibility for optically reading out the information from matrix-type substrates having a multiplicity of individual samples which allows a fast read-out of a radiation which is influenced by the individual samples with a high degree of sensitivity.

Abstract: An arrangement is disclosed for reading out the fluorescent radiation of specimen carriers with a plurality of individual specimens which for purposes of exciting fluorescent radiation in selected individual specimens comprises a switchable electro-optical matrix for generating illumination which is limited in a spatially defined manner.

Abstract: A device for identifying fingerprints by use of ultrasound having an electronic evaluating circuit, a hollow cylinder of length L with a cover and a base plate, wherein the ultrasonic speed through the liquid equals c' and the cover is made from a material with ultrasonic speed c". The outer side of the cover is planar to serve as a supporting surface for the fingerprint. The inner side is either convex (c'>c') or concave (c'<c") with a spherical radius R and the condition L=R/.vertline.(c"/c')-1.vertline. must be satisfied. The individual ultrasonic receiver is arranged in the center of the base plate and extends over the smallest possible surface area. At least one annular transmitter is arranged concentrically around the individual ultrasonic receiver.