Abstract:
Before being introduced within the intensifier, the grid which is nearest the anode is coated with a layer of electrically conductive material having the property of oxidizing alkali metals. This has the effect of elininating any parasitic illumination of the viewing screen caused by alkali metals unintentionally deposited on the grid at the time of formation of the photocathode.
Abstract:
An input screen and method of forming one for an image intensifier tube including a substrate in which a plurality of crystal grains of aluminum or aluminum alloy are formed in a plane with the crystal grains having non-directional shapes in the plane. The crystal grains are formed by heating in a vacuum or non-oxidizing atmosphere at a temperature between 450.degree. C. and 650.degree. C. The oxidized layer is next removed by an etchant, and a phosphor layer formed on the crystal grains by vapor-deposit.
Abstract:
A photocathode is formed by depositing a film of tellurium on a conductive base and then sensitizing the tellurium with at least two different alkali metals such as cesium and potassium or sodium and potassium. The photocathode has high sensitivity in the ultraviolet region and is substantially insensitive to solar radiation through the earth's atmosphere. Such a photocathode is useful in "solar-blind" detectors.
Abstract:
Self-healing photocathode device comprising a photoemissive multi-alkali semiconductor comprising a multi-alkali antimonide having the formula AxBy CzSb, where A, B and C are Group I alkali metals and x+y+z=3; a nanostructured porous membrane, one surface of which is in direct contact with the multi-alkali semiconductor and the opposing surface of which is disposed toward the inside of a sealed reservoir, such that the porous membrane and the sealed reservoir form a volume which is maintained at low pressure; a temperature control means in contact with the porous membrane, wherein the temperature control means regulates the temperature of the porous membrane at 200° C. or less; a source comprising elemental cesium which is releasable into the enclosed volume; and, a current conducting means attached to the source.
Abstract translation:包含具有式AxBy CzSb的多碱锑化物的光发射多碱半导体的自愈合光电阴极装置,其中A,B和C是I族碱金属,x + y + z = 3; 纳米结构多孔膜,其一个表面与多碱半导体直接接触并且其相对表面设置在密封储存器的内部,使得多孔膜和密封储存器形成维持的体积 在低压下 与所述多孔膜接触的温度控制装置,其中所述温度控制装置将所述多孔膜的温度调节至200℃以下; 包含可释放到封闭容积中的元素铯的源; 以及附接到源的电流传导装置。
Abstract:
The cathode for photo-electron emission 5 is comprised of an alkali metal containing layer 5d made of material for emitting photo-electrons by the entry of light or for emitting secondary electrons by the entry of electrons, such as particles which consist of an alkali antimony compound, on an Ni electrode substrate 5c on which an Al layer 5b is deposited, and has an intermediate layer 5a made of carbon nano-tubes between the alkali metal containing layer 5d and the Ni electrode substrate 5c, therefore the defect density inside the particles is decreased, and the recombining probability of electrons and holes drops remarkably, which improves the quantum efficiency.
Abstract:
A photomultiplier comprising an electron multiplier for minimizing a variation in multiplication factor and noise is characterized in that insulating members are aligned on the same line to insulate a plurality of dynode plates for constituting a dynode unit from each other, thereby preventing a damage to each dynode plate. At the same time, a through hole is formed to fix the insulating member provided to each dynode plate such that a gap is provided between the major surface of the dynode plate and the surface of the insulating member, thereby preventing discharge between dynode plates, which is caused due to dust or the like deposited on the surface of the insulating member.
Abstract:
An X-ray imaging tube which comprises a vacuum envelope, an input screen comprising a substrate located in the input end of the envelope, an input phosphor layer formed on the substrate and comprising a number of columnar phosphor crystals, and a photoelectric layer formed directly or indirectly on the input phosphor layer, an anode and an ouput screen located in the output end of the envelope, and a beam-converging electrode located in the envelope and extending along the inner surface of the envelope. The tube further comprising optically opaque layers which are formed in each columnar crystal and extending from the surface thereof. A method of manufacturing an X-ray imaging tube, disclosed herein, comprises the steps of vapor-depositing a predetermined phosphor on a substrate, thereby forming on the substrate an input phophor layer consisting of columnar crystals, vapor-depositing a predetermined material, thereby forming an optically opaque layer on the tip of each columnar crystal, sputtering the optically opaque layer, thereby removing a part of the optically opaque layer formed on the tip of the columnar crystal, vapor-depositing said predetermined phosphor, and, if necessary, repeating these steps, thereby forming a plurality of optically opaque layers in each columnar crystal, which extend from circumferential surface of the columnar crystal.
Abstract:
Alkali metal source comprises a powder of silicon or germanium grains having a shell of a compound of silicon or germanium and the alkali metal.