Abstract:
A weak light detector (40) which can detect two-dimensional weak radiation at a high speed with high precision. The fluorescence from the DNA chip (46) is incident on a detection part (56) of a detection unit (52). The detection unit (56) has a detection module with a number of detection transistors being placed to correspond to cells of the DNA chip (46). The detection part (56) performs photoelectric conversion of the incident fluorescence (photon) to emit electrons, and amplifies the electrons to make them incident on the detection module. The detection transistors are switched based the Hadamard matrix to operate. A data processing unit (54) reads an output signal of the detection part (56), then performs Hadamard inversion, and determines the detection transistor which outputs the signal.
Abstract:
The present invention relates to a photodetector that has a structure capable of realizing a wide range gain adjustment for each of electron multiplier channels respectively assigned to a plurality of light incidence regions of a multi-anode multiplier. The photodetector comprises a multi-anode photomultiplier, and a bleeder circuit unit. The multi-anode multiplier has a dynode unit constituted by N (an integer or no less than 3) dynode plates, and n-th (an integer of no less then 2) dynode plate is constituted by a plurality of control plates respectively corresponding to the multiplier channels. The bleeder circuit unit has a primary section setting each potential of a first to (n−1)-th and (n+1)-th to N-th dynode plates, and a secondary section for individually setting a potential of each control plate at any potential within the range wider than a potential difference between the (n−1)-th and (n+1) dynode plates. By expanding the potential setting range for the control plates rather than the potential difference between the dynode plates adjacent to the n-th dynode plate, the gain of each electron multiplier channel can be controlled by two digits or more.
Abstract:
A weak light detector (40) which can detect two-dimensional weak radiation at a high speed with high precision. The fluorescence from the DNA chip (46) is incident on a detection part (56) of a detection unit (52). The detection unit (56) has a detection module with a number of detection transistors being placed to correspond to cells of the DNA chip (46). The detection part (56) performs photoelectric conversion of the incident fluorescence (photon) to emit electrons, and amplifies the electrons to make them incident on the detection module. The detection transistors are switched based the Hadamard matrix to operate. A data processing unit (54) reads an output signal of the detection part (56), then performs Hadamard inversion, and determines the detection transistor which outputs the signal.
Abstract:
A dynode (8) constituting an electron multiplier or a photomultiplier is provided with eight rows of channels (15) each defined by an outer frame (16) and a partitioning part (17) of the dynode (8). In each channel (15), a plurality of electron multiplying holes (14) are arranged. In specified positions of the outer frame (16) and the partitioning part (17) of the dynode (8), glass receiving parts (21) wider than the outer frame (16) and the partitioning part (17) are provided integrally with the dynode (8). Glass parts (22) are bonded to all the glass receiving parts (21). The glass parts (22) are bonded by applying glass to the glass receiving parts (21) and hardening the glass and each have a generally dome-like convex shape. Each dynode (8) is formed after the dome-like glass part (22) is bonded to the glass receiving part (21).
Abstract:
A dynode (8) constituting an electron multiplier or a photomultiplier is provided with eight rows of channels (15) each defined by an outer frame (16) and a partitioning part (17) of the dynode (8). In each channel (15), a plurality of electron multiplying holes (14) are arranged. In specified positions of the outer frame (16) and the partitioning part (17) of the dynode (8), glass receiving parts (21) wider than the outer frame (16) and the partitioning part (17) are provided integrally with the dynode (8). Glass parts (22) are bonded to all the glass receiving parts (21). The glass parts (22) are bonded by applying glass to the glass receiving parts (21) and hardening the glass and each have a generally dome-like convex shape. Each dynode (8) is formed after the dome-like glass part (22) is bonded to the glass receiving part (21).
Abstract:
A venetian-blind type of photomultiplier tube comprising a photocathode for converting an incident light into photoelectrons, a venetian-blind type of dynode array comprising plural dynode rows arranged in a first direction, each of which comprises plural dynode elements arranged at a constant pitch in a second direction, each dynode element having a plate inclined to the first direction for emitting the secondary electrons, an anode array comprising plural anodes arranged in the second direction for collecting the secondary electrons emitted from the dynode array and outputting an amplified electrical signal corresponding to the light, and one or more electron converging electrodes for converging at least one stream of the photoelectrons and the secondary electrons and concentrically directing the converged stream to a predetermined portion of each of the dynode elements. The electron-flight control member may have various patterns such as a grid, strip, mesh and multi-aperture structures.
Abstract:
The present invention refers to a digital anode that permits capturing electrons and digitalizing their location on a given surface, so that it can be stored in a memory to be later processed and either interpreted, printed, filtered or transferred.
Abstract:
A multiple section photomultiplier tube constructed as a matrix of several independent tubes in one envelope. The photocathode to dynode spacings are isolated by a separator configuration built with walls which interlock in cooperating slots, and each photocathode operates with its own independent dynode cage. One dynode in each cage is maintained electrically independent, and its connection is brought out of the envelope independently. This permits independent adjustment of the gain for each of the tube's multiple sections, so they can be adjusted to the same response for a standard radiation signal. The entire tube can then be used to monitor a large area for radiation, and will yield the same response over its entire cathode area.
Abstract:
An electron tube comprising a stack of at least one perforate plate-shaped insulating element and at least one perforate plate-shaped metal electrode structure, the insulating element comprising a core and being provided with an aluminium layer at least on a side facing the electrode structure, at least the outer layer of the aluminium layer being oxidized, and the coefficients of thermal expansion of the core and the electrode structure being at least substantially equal. In this manner, the thermal stresses occurring between the insulating element and the electrode structure during firing are reduced, so that the risk of their displacement relative to each other is reduced.
Abstract:
A photomultiplier tube comprising a photocathode, a plurality of mesh dynodes arranged parallel to the photocathode, an anode that is disposed in a face-to-face relationship with the photocathode in such a manner that the mesh dynodes are interposed between the anode and the photocathode, the anode being divided into segments larger than the openings of each dynode, and at least one layer of focusing electrode for focusing an electron beam by the lens action which is disposed between the photocathode and the anode.