Title: Device for photoelectric measurements of moving parts

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Abstract: Apparatus for photoelectric measurements of a parameter of a movable part such as the rotary speed thereof wherein the part is provided with constrast marks thereon and the light source and the light receiver of the apparatus are not separated by the movable part. The light source and the light receiver are commonly housed in a scanner unit arranged at one end face of a light conductive member, the other end face being positioned proximate to the contrast marks on the movable part such that the light conductive member forms a light beam path for directing light from the light source onto the movable part and for directing reflected light from the movable part to the light receiver. For measurements required within a chamber, the light conductive member extends through a passage in the casing of the chamber which passage may be arranged radially or axially of the chamber and is secured within the passage, which may effect a vacuum-tight seal for vacuum-tight integrity of the chamber, such that the end face carrying the scanner unit is positioned outside of the chamber while the other end face is positioned within the chamber.


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