Abstract: A light beam projecting arrangement including a first cluster of light sources arranged to provide a first cluster of light beams having a first etendue and a second cluster of light sources arranged to provide a second cluster of light beams having a second etendue, and means for changing the direction of the first cluster and/or the second cluster of light beams. The light sources are arranged so that the total etendue of the first cluster of light beams is substantially equal to the etendue of the second cluster of light beams; and where the means for changing the direction are arranged so that the clusters of light beams are brought into a combined cluster light beam having substantially the same etendue as the larger one of the first etendue and the second etendue.

Abstract: A projector, including a light modulation module including at least one light modulator illuminated by light of at least two primary colours, light of each primary colour having at least two wavelengths or wavelength ranges, where the optical power emitted at a wavelength or wavelength range associated with a lower contrast of a projected image is lower than the optical power emitted at a wavelength associated with a higher contrast of the projected image.

Abstract: This document relates to an optical detection method and system for detecting a spatial feature on or below a surface of a substrate. The method includes providing, using an optical radiation source, a beam of optical radiation; directing the optical radiation beam using beam-directing optics towards the substrate surface for impinging the optical radiation beam on the surface; receiving, by a focusing objective, a returning portion of the optical radiation that is returned by the substrate surface, said returning portion including a scattered portion that is scattered by the substrate; and providing a reference radiation having an equal phase with the returning portion of the optical radiation.

Abstract: A projector, including a light modulation module including at least one light modulator illuminated by light of at least two primary colours, light of each primary colour having at least two wavelengths or wavelength ranges, where the optical power emitted at a wavelength or wavelength range associated with a lower contrast of a projected image is lower than the optical power emitted at a wavelength associated with a higher contrast of the projected image.

Abstract: A light beam projecting arrangement including a first cluster of light sources arranged to provide a first cluster of light beams having a first etendue and a second cluster of light sources arranged to provide a second cluster of light beams having a second etendue, and means for changing the direction of the first cluster and/or the second cluster of light beams. The light sources are arranged so that the total etendue of the first cluster of light beams is substantially equal to the etendue of the second cluster of light beams; and where the means for changing the direction are arranged so that the clusters of light beams are brought into a combined cluster light beam having substantially the same etendue as the larger one of the first etendue and the second etendue.

Abstract: A transducer is provided for determining the concentration of contaminants in fabric webs. The transducer includes an insulated measuring roller with two electrode rings separated by insulation and extending to the surface of the roller. The roller is supported on swing arms and the electrode rings are connected in the circuit of a conductivity meter. The swing arms cooperate with springs to provide for pressing of the roller against an insulated guiding roller for the fabric web under test. Additional metallic rings can be included in the roller which include temperature sensors used for compensating for the temperature dependency of the conductivity measurement. The guiding roller comprises a metallic roller with an insulating coating. Pairs of the rollers can be included in a device for washing fabric webs.