Programmed Control of a Sine-Wave Grating Generator for Visual Research.

摘要

This describes the development of an automatic controller for an Optronix Optical Signal Generator. The signal generator is used by the Aerospace Medical Laboratory/HEA at Wright-Patterson AFB to test human visual response to sine-wave gratings. The computer used in development of the controller was a Z80 based Mostek MDX CPU-2. Sensing of the optical signal to be controlled was accomplished by a Reticon RC-100 Series Circuit Board with a G Series Array Board containing 1024 diode elements. The Reticon Array Board produces an analog video signal for each diode in the array. The computer then selects every fifteenth diode value and stores it, calculates the actual screen brightness and contrast from the stored values, and outputs a correction signal to the generator. The circuits developed include the flags required to synchronize the computer with the Reticon Card, the circuits required to input the desired values for contrast and brightness, and the circuit used to select every fifteenth diode of the array scan to be read. This controller was never fully operational, but all of the major circuits have been tested and do function. (Author)