Abstract: Bi-stable image storage apparatus for storing, interrogating, and erasing two-dimensional binary images represented by arrays of light and dark areas. The storage apparatus comprises a pair of image amplifiers, preferably, inverting amplifiers, coupled together into a closed loop optical circuit such that the output of one device will be read into the other device. As long as the gain of the circuit is greater than one the circuit will drive itself to saturation and store an image optically applied thereon. The system provides a very inexpensive circuit for storing images, and can be used in a wide variety of processing and display applications.

Abstract: A sweeping spectrum analyzer for analyzing the frequency and amplitude of an input signal is comprised of a Bragg cell with a laser beam input and an accoustic signal input. An input signal is mixed with a sweep signal to produce a heterodyned signal within the acoustic bandwidth of the Bragg cell. The heterodyned signal is applied to the Bragg cell and results in deflection of a laser beam passing therethrough. The Bragg cell output is imaged onto a charge coupled photodetector array and fed to a shift register as clock pulses. The clock pulses are synchronized with the sweep signal frequency for transfer as one charge packet down a charge coupled array.

Abstract: A system for precisely determining the position of a beam of incident radiation. In one embodiment in the disclosure the system is utilized in an orbiting, Ritchey-Chretien telescope to determine the precise position of the image of a guide star in the focal plane of the telescope. In that embodiment a first reticle plate, having concentric ring reticle lines, is located at the edge of the tangential focal surface of the telescope and outside of the focal area being used for observation. A second reticle plate, having radial reticle lines, is located adjacent to the first reticle plate at the edge of the sagittal focal surface of the telescope and outside of the focal area being used for observation. A relay lens system and an image dissector tube are positioned behind the reticle plates so that light refracted by the reticle plates is passed by the relay lens system to the image dissector tube. A guide star is imaged on the first and second reticle plates.

Abstract: Apparatus for maintaining image definition and intensity in optical image processing operations. The apparatus comprises an improved photosensitive device responsive to an applied radiation image pattern for establishing internal electric fields each of which are representative of the intensity of different portions of the applied pattern. Associated with the photosensitive device are a plurality of transparent, conductive targets or conductors aligned to receive the different portions of the applied radiation pattern and to establish discrete internal fields in the device which are uniform over the area of each target notwithstanding any non-uniformities that might exist in the intensity distribution of any of the portions of the applied pattern.

Abstract: A Bragg cell spectrum analyzer in which the output of the Bragg cell is detected by a unique electro-optic system which allows the selection of any desired dynamic power detection range. As is known in the art, the output of a Bragg cell consists of a radiation spot or spots along a line in which the position of each spot along the line is related to the frequency of a component of the input signal to the Bragg cell, and the intensity of radiation of each spot is proportional to the strength of the component causing that spot. In the disclosed embodiment the output of the Bragg cell is directed upon a cylindrical lens system which expands each spot into a line of radiation. This results in a two dimensional pattern of lines with the position of each line being the same as the position of the radiation spot causing the line, and the intensity of radiation in each line being proportional to the intensity of radiation in the spot causing that line.