Showing papers by "Saab Automobile AB published in 1970"

Device for linear displacement of a plane optical image in its own plane

Abstract: An optical apparatus for displaying spectral images is disclosed, the device including two reflecting planes fixed at right angles to each other but displaceable with respect to an image plane to permit a scanning of an optical image. Both reflecting planes are at a 45* angle with the image plane, and the line of intersection of the two reflecting planes oscillates in a direction which is transverse to the line of intersection of the reflecting planes, whereby the image is scanned sinusoidally past an opening in the image plane. A light-sensitive element behind the opening transforms the light into an electrical signal which corresponds in amplitude to the light intensity and which can be displayed on an oscilloscope. A sensing means tracks the swing movement, generating a signal which may be used as one coordinate axis of the oscilloscope display. A phase correction network is located between the sensing means and the oscilloscope so that the correct phase relationship between the oscillating swing and the display may be obtained.