Abstract: What is disclosed is a method for driving a laser scanner, comprising a beam deflection system for a laser beam emitted by a laser light source, wherein a minimum distance to be observed is determined in dependence on the laser power of the laser light source. During the measurement the detected object distance is compared with this minimum distance, and the laser light source is deactivated and/or the laser power is reduced if the detected object distance is less than the minimum distance. There is moreover disclosed a laser scanner for implementing this method.

Abstract: What is disclosed is a 3-D laser measurement system, including a mirror continuously rotatable about a rotation axis which extends, e.g., in parallel or coaxial with a measuring beam emitted by an optical emitter and impinging on the mirror.

Abstract: What is disclosed is a method for driving a laser scanner, comprising a beam deflection system for a laser beam emitted by a laser light source, wherein a minimum distance to be observed is determined in dependence on the laser power of the laser light source. During the measurement the detected object distance is compared with this minimum distance, and the laser light source is deactivated and/or the laser power is reduced if the detected object distance is less than the minimum distance. There is moreover disclosed a laser scanner for implementing this method.

Abstract: What is disclosed is a 3-D laser measurement system, including a mirror continuously rotatable about a rotation axis which extends, e.g., in parallel or coaxial with a measuring beam emitted by an optical emitter and impinging on the mirror.

Abstract: A process for the preparation of a copolymer comprises reacting in an aqueous medium at a temperature of from 25° C. to 100° C. in the presence of from 1.0-25 weight percent based on the total weight of a), b) and c) of a free-radical initiator, a) at least one monomer selected from the group consisting of &agr;,&bgr;-unsaturated monocarboxylic acids and their salts, &agr;,&bgr;-unsaturated dicarboxylic acids, their half-esters free of polyoxyalkylene side chains and their salts, b) at least on olefinic monomer selected from the group consisting of aromatic vinyl compounds, vinyl ethers, vinyl esters, nitrogen-containing vinyl compounds and aliphatic olefins, and c) from 0.

Abstract: A system and method for determining at least one physical quantity by means of a relation between a transmission signal and a reception signal, wherein a transmitter emits the transmission signal having a predetermined frequency through a signal path for reception as the reception signal by a receiver. A reference signal generator generates a reference signal having a frequency which has a predetermined fixed relation to the frequency of the transmission signal. The reception signal is mixed with the reference signal to produce an intermediate frequency signal, which is filtered to isolate a difference signal, converted to a digital signal and then processed digitally to determine a phase and/or amplitude relation of the respective physical quantity to be determined. The transmission signal, the reference signal and the digital signal are generated in phase-locked relation using a clock signal derived from a main clock pulse of a master oscillator.