Abstract: A vector-matrix multiplier in which a matrix is stored in an electron trapping material by exposing the material to visible light passed through a liquid crystal device, which acts as a mask. The visible light raises electrons in the electron trapping material to a higher energy level at the exposed locations. Infrared light is then passed through the liquid crystal device to form an input vector, which is projected onto the electron trapping material. The infrared light releases electrons from the higher energy level, resulting in emission of a pattern of visible light. The emission of visible light from the electron trapping material forms an output representing the product of the input vector and the matrix.

Abstract: A method for using electron trapping materials to perform subtraction of images. One image is written onto a 2-dimensional screen of electron trapping material. A second image that has many of the elements of the first, but less than the total number of elements of the first, is erased from the electron trapping screen with infrared light. An exposure of the entire screen to infrared light results in luminescence output from those regions in which electrons remain trapped after the subtraction. Potential applications include machine inspection, image compression, etc. Images can be written on the screen of electron trapping material using energetic radiation or using short wavelength visible light.

Abstract: A vector-matrix multiplier in which a matrix is stored in an electron trapping material by exposing the material to visible light passed through a liquid crystal device, which acts as a mask. The visible light raises electrons in the electron trapping material to a higher energy level at the exposed locations. Infrared light is then passed through the liquid crystal device to form an input vector, which is projected onto the electron trapping material. The infrared light releases electrons from the higher energy level, resulting in emission of a pattern of visible light. The emission of visible light from the electron trapping material forms an output representing the product of the input vector and the matrix.

Abstract: A high resolution photostimulable storage phosphor screen for breast imaging using X-rays. The phosphor material for storing the image, SrS;Ce,Sm, is appropriately milled to a fine powder and dispersed, using appropriate methods, with high particle packing density, on a supporting substrate. The coated substrate froms a planar imaging screen for mammography. The phosphor screen of the present invention can record high quality digital (as opposed to analog) images for diagnostic breast imaging.

Abstract: A novel, high-speed spatial light modulator utilizing electron trapping materials. The electron trapping material is exposed to a pattern of modulating radiation, resulting in the excitation of electrons in the material at spatial locations corresponding to the pattern. When the light to be modulated (ordinarily coherent light) is simultaneously or subsequently passed through the material, it is absorbed in areas of the material where electrons have been excited. The unabsorbed light passes through the electron trapping material, producing a negative image of the pattern of modulating radiation. The electron trapping material also emits an image of incoherent visible light as the released electrons fall back to the ground state. This visible image can be filtered out if the device is only being used for modulating coherent light.

Abstract: An imaging screen for detecting and storing information corresponding to the pattern of emission from an electrophoresis gel containing radioactively labelled, dye-tagged or chemiluminescent labelled DNA, RNA, or protein fragments. The imaging screen is coated with an electron trapping material which releasably stores energy from the impingement of the emission from the electrophoresis gel in the form of energy corresponding the pattern and flux of the emission. When subjected to optical energy of a first wavelength, the electron trapping material releases the stored energy in the form of optical energy of a second wavelength corresponding the flux and pattern of the emission from the electrophoresis gel. The released optical energy of a second wavelength is then detected and coverted to electrical signals representative of the flux and pattern of emission from the electrophoresis gel.

Abstract: In a preferred embodiment, a radioluminescent lamp having a glass face plate with a plurality of parallel planar light guides, each preferably having a transparent glass, sapphire or quartz base member, disposed perpendicularly with respect to the glass face plate and coated on both sides with a thin film of radioluminescent phosphor material. The plates are mounted in a sealed envelope filled with tritium gas, the radioactive decay of the tritium causing the phosphor to luminesce. The phosphor material and all but one of the edges of each light guide are overcoated with a reflective material, such as aluminum, to guide the generated light to a single edge of the light guide, which edge is adjacent the glass face plate. The phosphor is preferably a calcium sulfide-based material forming a continuous, binder-free layer on the transparent base member.