摘要:
An electron filtering layer placed on a photocathode of a UV light detector allows to selectively filter out electrons generated from a photoconversion of long wavelengths. The filter may be tuned by selecting the material and the thickness of the electron filtering layer. By means of the filtering layer, background noise due to visible parts of the spectrum may be efficiently suppressed. Applications of the invention include a solar-blind flame and/or smoke detector.
摘要:
The invention relates to a radiation converter, comprising a radiation absorber (2), for the generation of photons as a function of the intensity of the incident x-ray radiation and a photocathode (3), arranged within the radiation absorber (2), at a distance (a) in the direction of radiation. Said photocathode (3) is for the generation of electrodes as a function of the photons emitted by the radiation absorber (2), with a device for accelerating the electrons emitted by the photocathode to an electron detector (5). Said detector generates an electrical signal as a function of the arriving electrons. An electron multiplier (4) is arranged between the photocathode (3) and the electron detector (5), whereby the electrons emitted y the photocathode (3) may be multiplied by the electron multiplier (4).
摘要:
In an electron tube (1), a space (S) between the periphery (15b) of a semiconductor device (15) and a stem (11) is filled with an insulating resin (20). Therefore, the insulating resin (20) functions as a reinforcing member even during the assembly of the electron tube (1) under high-temperature condition, thereby preventing a bump (16) from coming off a bump connection part (19). Since the space (S) is only partly closed by the resin (20), the space between the semiconductor device (15) and the stem (11) is ensured a ventilability. That is, no air reservoir is formed between an electron incidence part (15a) at the center of the semiconductor device (15) and the surface (C) of the stem (11), whereby air expanding at high temperature does not damage the electron incidence part (15a) of the back-incidence semiconductor device (15).
摘要:
In order to give a sufficiently strong adhesive strength to the input screen of an X-ray image tube, to improve the resolution of the output picture of the image tube, and to secure the luminance uniformity of the output picture as necessary, the surface of the input substrate of the image tube composed of aluminum or an aluminum alloy is varnished so that fine recessing and projecting sections of the substrate material can be eliminated from the surface and nondirectional gentle recessing and projecting sections can be left as they are. Such gentle recessing and processing sections that the average distances between adjacent valleys fall within the range of 50-300 mu m and average heights between the crests and valleys fall within the range of 0.3-4.0 mu m are suitable for those to be left as they are. When the input substrate is varnished in the above-mentioned way, the resolution of the output picture of the image tube can be improved because the diffusion of light on the surface of the input substrate is suppressed, and the picture noise which is caused by the fine recessing and projecting sections is reduced.
摘要:
An electron tube 10 mainly includes a sleeve 12, an input plate 14 having a photocathode surface 18, a stem 16 and a CCD 20. A vacuum is provided in an interior of the electron tube 10. The CCD 20 is fixed onto the stem such that a rear surface B faces the photocathode surface 18. In the CCD 20, on a single conductive type semiconductor substrate 64, a buried layer 66, a barrier region 68, a SiO 2 layer 70, a storage electrode layer 72, a transmission electrode layer 74, and a barrier electrode layer 76 are formed at their predetermined positions. A PSG film 78 is formed at an entire front surface A over these layers to flatten the surface of the CCD 20. Further, SiN film 106 mainly composed of SiN is formed above the PSG film over the entire front surface A.
摘要:
An X-ray image intensifier includes an input screen (26) for converting incident X-rays into photoelectrons, and an output screen for converting the photoelectrons into visible light. The input screen includes a phosphor layer (38). The phosphor layer has a large number of columnar crystals (33) of a phosphor which have end faces constituting a smooth surface facing the output screen. A low-refractive-index layer (41) is formed on the phosphor layer and made of a material having a refractive index smaller than a refractive index of the phosphor, with respect to the light having a specified wavelength, at which the fluorescence of the phosphor is the most intensive. A photoemissive layer (43) is formed directly or indirectly on the low-refractive-index layer.
摘要:
An infrared external photoemissive detector can have an n-p heterojunction comprising an n-type semiconductor layer and a p-layer; the n-layer semiconductor comprising doped silicon embedded with nanoparticles forming Schottky barriers; and the p-layer is a p-type diamond film. The nanoparticles can be about 20-30 atomic percentage metal particles (such as silver) having an average particle size of about 5-10 nm. The p-layer can have a surface layer that has a negative electron affinity. The n-layer can be in the range of about 3 μm to 10 μm thick, and preferably about 3 μm thick. The doped silicon can be doped with elements selected from the list consisting of phosphorus and antimony.
摘要:
A detector for an electron multiplier comprising: a substrate (102) comprising a dielectric material, the substrate having a first face (110) and an opposing second face (108); a charge collector (122) provided adjacent the first face (110) of the substrate (102); an anode (104a-d) within the substrate (102), the anode (104a-d) spaced from the first face (110), such that the anode (104a-d) is capacitively coupled to the charge collector (122), so that charge incident on the charge collector (122) generates an image charge on the anode (104a-d); and a conduit contact (106a-d), coupled to the anode (104a-d) and passing through the substrate (102) to the second face (108) of the substrate (108).