摘要:
An optical image processor utilizes a source of partially coherent light and a spatial filter with a highly selectable modulation transfer function for processing an image, which may be present in real time. The spatial filter contains electro-optic material with electrodes arranged on such material to form a plurality of annular bands of different radii that are concentrically-situated and invididually-addressable. The annular bands are changeable in transmissivity in a continuous spectrum from transparent to opaque in response to an electrical signal on the respective electrodes of the bands. A first optical transmission path receives the image to be processed and optically transmits the image to the spatial filter for processing. A second optical transmission path receives the image processed by the spatial filter and optically transmits the image to an output port. The first and second optical transmission paths may each contain a respective spatial light modulator, whereby, for example, gray scale operations can be performed on the image. Each of the first and second optical transmission paths may include a respective zoom lens, whereby the output image size may be adjusted during image processing without interfering with the operation of the spatial filter. The spatial filter may have a reflective backing on one side for system compactness.
摘要:
Disclosed is a high voltage inverter for converting DC power to AC power with one or more AC output phases. The inverter has for each AC output phase an AC input phase circuit comprising first and second cold cathode field emission controllable electron tubes of triode, tetrode or pentode structure. Each electron tube has a first input node for connection to a high voltage DC potential in excess of 20 KV and a second input node for connection to ground. First electron tube is serially connected between a first end of a primary winding and ground, and second electron tube is serially connected between a second end of the primary winding and ground. Control circuitry controls the electron tubes so that the first and second electron tubes alternatively conduct so as to alternately bring the first and then second end of the primary winding approximately to the potential of ground.
摘要:
A directional optical coupler is shown and described, which includes an optical cell that is made of a first transparent conductor, a second transparent conductor and an electro-optical member interposed between the two transparent conductors, the electro-optical member having an index of refraction which can be varied only along one crystal axis by application of an electric field.
摘要:
A directional optical coupler is shown and described, which includes an optical cell that is made of a first transparent conductor, a second transparent conductor and an electro-optical member interposed between the two transparent conductors, the electro-optical member having an index of refraction which can be varied only along one crystal axis by application of an electric field.
摘要:
An X-ray source with a cathode formed as a cylindrical electrode having a hollow central anode tube on its axis, with a grid surrounding the anode and interposed between the anode and cathode. The central anode tube is hollow and filled with a working medium. A high negative voltage is applied to the cathode, but the flow of electrons to the anode is blocked by the grid which is held near cathode potential. After a space charge is created at the grid by electrons from the cathode, a very short pulse to ground is applied to one end of the grid, yielding a relativistic wave of potential which propagates along the axial length of the grid. This wave of potential releases the electrons from the cathode, which flow directly to the anode. The impingement of the electrons on the tubular anode produces X-rays from the interior surface of the anode tube. These X-rays, together with the impinging electrons, pump the working medium along the length of the anode, causing a population inversion leading to the release of coherent X-rays in a wave synchronized with the propagating grid potential which exits the structure at the far end of the anode. The X-ray source may consist of identical units coupled together in series to provide a high power X-ray beam, and may be configured in other than cylindrical shapes depending on the output desired.
摘要:
An X-ray tube has a wide area cold cathode with a graphite felt surface which faces and is spaced from a wide area anode of high atomic number material. A grid is interposed between the two and the anode, grid and cathode are enclosed in an envelope which is filled with gas at a low pressure. The graphite surface of the cathode is connected to a relatively high negative potential so that electrons are emitted from the entire surface area and impinge upon the anode, after triggering by the grid. The distribution of the energy of photons emitted from the anode is relatively constant during the ignition period of the tube. An extremely wide area X-ray source is then defined having constant bremstrahlung content which enables good gray scale measurements when employing the X-ray source. A pinhole collimator disposed externally of the tube ensures collimation of the output X-ray field. A polarized electron beam is used as a collimator in place of the pinhole collimator, in a preferred embodiment, to produce a collimated, wide area X-ray flux. The cathode, grid and anode structure can have any desired size or shape. The X-ray source can be flat and sized to illuminate a chest X-ray film or can be arcuate to at least partly wrap around the subject to be exposed to the X-rays. Arcuate X-ray sources can be linked end to end and scanned sequentially to define an X-ray source for use in Computer Axial Tomography (CAT) scan type applications. The same computer algorithm used for conventional CAT scan analysis can be used.
摘要:
Disclosed is a system for extracting energy from controlled fusion reactions. The system includes a central target chamber for receiving fusion target material. A plurality of energy drivers are arranged around the target chamber so as to supply energy to fusion target material in the chamber to initiate a controlled fusion reaction of the materials releasing energy in the forms of fusion plasma and heat. A plurality of structures for extracting energy from the fusion reaction are provided, and comprise devices to extract high voltage DC power from the fusion plasma; and means to extract thermal energy from the central target chamber. Power to the energy drivers may be supplied from high voltage DC power extracted from the fusion reactions. The energy drivers may use an Apodizing filter to impart a desired shape to the wavefront of the driving energy for causing the fusion reactions, to avoid hydrodynamic instabilities.
摘要:
A high voltage switch tube with a central cathode cylindrically symmetric to and surrounded by a tubular anode, with a grid interposed between the cathode and anode. A high negative voltage is applied to the cathode, but the flow of electrons to the anode is blocked by the grid which is held near cathode potential. After a space charge is created at the grid by electrons from the cathode, the grid is pulsed to ground potential, releasing electrons from the cathode to yield a very high current pulse. The cathode is preferably a graphite foam sleeve mounted on a support structure.
摘要:
Disclosed is a system for extracting energy from inertial confinement fusion reactions, which includes a central target chamber for receiving fusion target material. A plurality of energy drivers are arranged around the target chamber so as to supply energy to fusion target material in the chamber to initiate an inertial confinement fusion reaction of the material, releasing energy in the forms of fusion plasma and heat. A plurality of structures for extracting energy from the fusion reaction are provided, and comprise devices to extract high voltage DC energy from the fusion plasma, and means to extract thermal energy from the central target chamber. Power to the energy drivers may be supplied from high voltage DC energy extracted from the fusion reactions. The energy drivers may use an apodizing filter to impart a desired shape to the wavefront of the driving energy for causing the fusion reactions, to avoid hydrodynamic instabilities.
摘要:
A pre-excited excimer laser is formed in a thin flat package. Input X-ray photons which are modulated by passing through a body to be analyzed raise the pre-excited excimer gas molecules to a lasing energy level and the coherent radiation produced is measured and produces an amplified image of the input X-ray photon modulation.