Abstract: A method for determination of a distance from an observation reference point to an object in a measurement volume that can be utilized in a passive optical remote sensing system, and optical remote sensing systems that utilizes the method.

Abstract: A method for determination of a distance from an observation reference point to an object in a measurement volume that can be utilized in a passive optical remote sensing system, and optical remote sensing systems that utilizes the method.

Abstract: A fan module for clean room applications, comprising outer, vertical restriction walls (5) with a lower edge part (6) having a planar lower surface (7) as well as an element (9) protruding from the outer edge of the planar lower surface for cooperation with a filter docking module (2) provided in a roof filter frame (4) having a substantially planar upper surface (8) with an extension corresponding to said planar lower surface, whereby said protruding element (9) is designed to overlap part of said filter docking module (2).

Abstract: The invention relates to a wind driven turbine, which includes a rotor having a plurality of spaced apart vanes. The rotor is adapted to rotate about the vertical axis of an elongate short which can transmit power to a prime mover or power take off. Each vane for the rotor is formed with a substantially concave, elongate trailing or reverse face. Wind deflecting means are provided for directing wind through a venturi, onto and along the concave trailing face of one or more vanes, as the one more vanes rotate downwind away from the venturi. The wind deflecting means can also assist in at least partially shielding from the wind, one or more vanes of the rotor, as the vanes rotat and move upwind towards the venturi.