Abstract: The Parallax Error Measurement Device (PEMED) is an instrument used to mere parallax error associated with military night sights and other sights containing reticles. The PEMED consists of the following components: aperture translation stage; camera lens positioning and translation stage; coherent fiber optic image transfer bundle; automated translation stage controller; low light level camera; video wave form monitor and storage oscilloscope. The measurement concept involves the principle of translating an aperture across a relatively large collecting optic instead of translating the collecting optic itself. This technique eliminates alignment and focus errors which might occur when the collecting optic is translated. The aperture translation stages are driven by servo motors under computer control where a positive verification signal is monitored by the computer after each specific translation distance is achieved.

Abstract: The laser source energy and the target source energy goes through a common ptical path to a beam splitter. The energy from the target source is filtered, allowing only the laser information to pass through to the laser quadrant detector. The second path from the beam splitter has a blocking filter to block the laser energy, and the remaining energy, that of the target source, is measured by the target quadrant detector. The geometric translator is a computer controlled azimuth and elevation gymbal device which tracks (drivers to null) the target source. The target source is a strobe lamp. The angular information from the dual quadrant detectors and the geometic translator are fed into an compact mini-computer.