Abstract: A method for determining siloxane content of a gas by non-dispersive infrared analysis including the steps of providing infrared light at a limited wave number band selected according to the absorption bands of the siloxanes, transmitting the infrared light at the limited wave number band to a volume of a gas to be analyzed, and detecting the intensity of the infrared light at the limited wave number band passed through the volume of a gas to be analyzed. The siloxane content is determined based on the absorption of the infrared light at the limited wave number band. Preferably, the limited wave number band lies in the range of 800 to 860 cm?1.

Abstract: A method for determining siloxane content of a gas by non-dispersive infrared analysis including the steps of providing infrared light at a limited wave number band selected according to the absorption bands of the siloxanes, transmitting the infrared light at the limited wave number band to a volume of a gas to be analyzed, and detecting the intensity of the infrared light at the limited wave number band passed through the volume of a gas to be analyzed. The siloxane content is determined based on the absorption of the infrared light at the limited wave number band. Preferably, the limited wave number band lies in the range of 800 to 860 cm?1.

Abstract: A focusing interferometer, wherein the focusing and orientation of the different mirrors of the interferometer have been successfully facilitated by combining the focusing mirror and the collimating mirror to provide a single spherical mirror surface and by reversing the paths of light that start from the beam splitter by assembly of mirrors which are arranged back-to-back to reflect to opposite directions such that their optical axes join, each of the mirrors including three flat mirror surfaces that are perpendicular to one another and are arranged to reflect to the direction of the point where the normals of the mirror surfaces intersect.

Abstract: A scanning interferometer includes an optical arrangement. The optical arrangement therein includes two mirrors diverting the travel direction of light, arranged back-to-back such that they reflect to opposite directions and that their optical axes join. The mirrors are arranged in a mounting, which is arranged to move back and forth by a moving mechanism. The mounting includes a base element supported by the body of the interferometer, at least two support arms connected with the base element at their first ends via first bending points and a mounting element connected with the second ends of the support arms via second bending points, the mirrors being fastened to the mounting element. The mechanism moving the mounting includes a assembly generating a linear back-and-forth movement and a transmission mechanism for converting the back-and-forth movement to a back-and-forth movement of the mounting element.

Abstract: A device for electronically identifying coins, or the like, is described in which coins fed along a feed path are illuminated by light passed from a light source essentially perpendicularly to the feed path. A photosensitive sensor receives the light which passes the coin and converts it to an electric signal representative of the coin diameter. The device utilizes a column-like light source and a lens assembly intermediate the coin and the sensor whereby the size requirements of the sensor are reduced.

Abstract: An IR-spectrometric analyzing procedure, the measuring absorbance and reference absorbance being detected simultaneously from an IR light beam conducted to pass through the sample and diffracted to a spectrum. An IR spectrometer comprising a light source (1), a sample cuvette (5), a diffraction member (6), detectors (7) and a calculating means (9) for determining the content values of the sample corresponding to the measuring absorbance, the detectors (7) having been arranged to detect the measuring absorbance and the reference absorbance simultaneously from the beam that has passed through the sample and been diffracted to a spectrum.