Patents Assigned to Polymetric AB
  • Optical angle-measuring device
    Patent number: 4969744
    Abstract: A plane-parallel plate (E) is irradiated with coherent light from a laser and an interference pattern observed on a screen (S) and imaged on a multi-channel, position defining detector (D). The interference pattern will move when the plate (E) is rotated about its axis. There is thus provided a highly sensitive angle-measuring device with which measurements can be made to fractions of a second of arc.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: November 13, 1990
    Assignee: Polymetric AB
    Inventor: Erik Ordell