Abstract: A radiation imager includes a photosensor array disposed on a substrate. The photosensor array is optically coupled to a scintillator. A cover plate is disposed over the photosensor array, and the cover plate fully comprises a light absorbing layer interposed between the scintillator and the cover plate.

Abstract: A fabrication chuck for applying a thin membrane to the irregularly-shaped surface of a workpiece includes a foundation adapted to hold the workpiece in a selected fabrication position and an upper chuck assembly adapted to be fastened to the foundation. The upper chuck assembly includes an applicator that is moveably mounted so that it can be displaced towards the workpiece in the assembly chamber. The applicator has a mating surface and is adapted to selectively retain the thin membrane on the mating surface until the applicator is disposed in a position so that the thin membrane can be released and deposited in a desired position on the workpiece. The foundation is adapted to generate a differential pressure across the workpiece and the thin membrane so as to draw the thin membrane down over the workpiece so that it is in conformal contact with the irregularly-shaped surface.

Abstract: A radiation imager having a scintillator mated to a photodetector array has a moisture barrier disposed over at least the portion of the scintillator exposed to the incident radiation. The moisture barrier, which is substantially impervious to moisture, is both radiation transmissive and optically reflective. A pellicle layer may be disposed between the top surface of the scintillator array and the moisture barrier to provide a stable surface to which the moisture barrier can adhere. The moisture barrier normally comprises an optically reflective layer and a moisture sealant layer. The optically reflective layer is comprised of a reflective metal or dielectric layers have different refractive indices and the moisture sealant layer is comprised of a silicone potting compound. A hardened protective window may be situated over the top surface of the moisture barrier.

Abstract: An elastomeric light valve has a substrate with a principal surface on which is formed a multiplicity of pixels; each pixel includes a first set of pixel electrodes interdigitated with a second set of pixel electrodes. A silicone elastomer gel is disposed over both the principal substrate surface and the two sets of pixel electrodes. At least one silicone/polycarbonate self-supporting pellicle is disposed substantially completely over the gel layer; the pellicle and elastomer gel layer are heat cured to improve the response of the layers to electrostatic forces induced in the light valve by control voltages applied during operation of the light valve. A layer of gold is disposed over the at least one pellicle and a layer of silver is disposed over the gold layer to provide an exposed specular surface which is easily deformed and resilient to transverse stresses.

Abstract: A phosphor screen for converting x-rays to light includes a large number of discrete columns of the phosphor material, say doped CsI, with the spaces therebetween preferably filled with a reflective substance, which itself may be phosphor (e.g., Gd.sub.2 O.sub.2 S or La.sub.2 O.sub.2 S). Because of the resulting inhibition of lateral spread of light within the phosphor screen, it may be made thicker than conventional screens while achieving at least as high resolution and contrast, thereby increasing brightness (and thus requiring lower x-ray "doses"). A method for making the screen includes using a patterned substrate and wide-angle vapor deposition (as in a hot-wall evaporator) so as to deposit the phosphor only on the raised portions of the substrate.

Abstract: A phosphor screen for converting x-rays to light includes a large number of discrete columns of the phosphor material, say doped CsI, with the spaces therebetween preferably filled with a reflective substance, which itself may be a phosphor (e.g., Gd.sub.2 O.sub. 2 S or La.sub.2 O.sub. 2 S). Because of the resulting inhibition of lateral spread of light within the phosphor screen, it may be made thicker than conventional screens while achieving at least as high resolution and contrast, thereby increasing brightness (and thus requiring lower x-ray "doses"). A method for making the screen includes using a patterned substrate and wide-angle vapor deposition (as in a hot-wall evaporator) so as to deposit the phosphor only on the raised portions of the substrate.