Abstract:
An assembly comprising a 3-D scanner and suitable for capturing at least one of objects, or textures, or documents. The assembly preferably can be developed as a pocket page scanner having dimensions approximately the size of a chalkboard eraser. The assembly preferably utilizes an alignment-insensitive diode laser interferometer. In operation, the assembly enables a user to scan any page-sized area in e.g., a half of second, store a hundred or so of them, then play them back into a PC infrared port for OCR, printing, archival storage, or further processing.
Abstract:
Ionization of air without the use of corona discharge tips, thereby to avoid the generation of particulates from corrosion of the corona tips, is accomplished by use of a laser beam focussed to a small focal volume of intense electric field adjacent a semiconductor chip. The electric field is sufficiently intense to ionize air. In the manufacture of a semiconductor circuit chip, during those steps which are conducted in an air environment, opportunity exists to remove from a surface of a chip, or wafer, charge acquired during the manufacturing process. The ionized air is passed along the chip surface. Ions in the air discharge local regions of the chip surface which have become charged by steps of a manufacturing process. By way of further embodiment of the invention, the ionization may be produced by injection of molecules of water into the air, which molecules are subsequently ionized by a laser beam and directed toward the chip via a light shield with the aid of a magnetic field.
Abstract:
A particle detector that determines the presence of particles in an enclosed volume includes a laser that directs a coherent optical beam to a beam splitter that produces first and second divergent beams. An optical system images the point of origin of the two divergent beams within the beam splitter into the enclosed volume, whereby the first and second beams are caused to intersect and interfere at an inspection region within the volume. A detector is positioned adjacent the volume and is responsive to light scattered from one of the beams, as a result of a particle passing through the inspection region, to produce an electrical signal indicative of the intensity of the scattered light. A signal processor analyzes the electrical signals and to determine the presence of the particle. An embodiment of the invention includes an acousto-optic modulator to enable one of the beams to be frequency shifted from the other beam so as to enable the presence of a carrier signal on which a particle's Doppler frequency is modulated. Another embodiment relies upon the Doppler modulation of a reflected optical beam to create an interference pattern at a detector.
Abstract:
A clean non-hydrogen-containing dry gas flows through the corona points of a clean room corona air ionizer in order to suppress the generation of particles.