32results about "Multiplier anode arrangements" patented technology

Techniques are disclosed that can be used to interface a microchannel plate (MCP) with readout circuitry. The techniques can be employed, for instance, with MCP based devices used in a numerous sensing / detection applications, and are particularly suitable for applications where it is desirable to interface an MCP having a relatively large active area to a readout circuit having a relatively smaller active area. The interface effectively decouples anode geometry from ROIC geometry and may also be configured with flexible anode pad geometry, which allows for compensation of optical blur variations as well as a very high fill factor. The interface can be made using standard semiconductor materials and photolithography techniques, and can be configured with thermal expansion qualities that closely track or otherwise match that of the readout circuitry.

The invention discloses an optimum design method for improving a light utilization ratio of photomultiplier photocathode. The method comprises the first step of selecting shape parameters of photomultiplier geometry; the second step of describing basic geometrical characteristic layers in a program; the third step of inputting material parameters of the basic geometrical characteristic layers; the fourth step of defining an interface between adjacent basic geometrical characteristic layers; the fifth step of generating a photon in a working medium at random, wherein the direction is random and a wavelength is sampled from a detection spectrum; the sixth step of simulating the physical process of the photon in the materials and judging whether the photon reaches a photocathode interface or not; the seventh step of working out the proportion that the photon reaches the photocathode and judging whether the second step is executed again or not to obtain a changing curve of the proportion that the photon reaches the photocathode along with the shape parameter values, selecting the optimum shape parameter according to the changing curve so that the light utilization ratio of the photocathode can be improved, and the purpose of improving the performance of the photomultiplier can be achieved. According to the optimum design method, the special optimization design is carried out according to the working environment and the detecting spectrum of the photomultiplier.

A mass spectrometer detector having a coupling capacitor including an anode that is placed at a high potential of say −4.9 kV. An annular electrode is placed outside the anode. A voltage of say −5 kV is applied to the annular electrode. This reduces the potential difference between the anode and the annular electrode, mitigating the electric field. A peripheral electrode is mounted on the outer fringe of a dielectric body and stably held at a potential of say −2.5 kV, for example, by voltage-dividing resistors.

The present invention adopts high-temperature co-firing multilayer ceramic technology to manufacture matrix anode and its method. The matrix anode multilayer ceramic substrate and the tube shell are provided with a keratable sealing disc, which is connected to the matrix anode multilayer ceramic substrate. The sealing plate takes over the housing, the matrix anode multilayer ceramic substrate is located on the inner surface of the vacuum chamber, and is uniformly arranged in an array of metal contacts to form an anode input array, and the matrix anode multilayer ceramic substrate is located on the outer surface of the vacuum chamber to form a uniform array Arranged x×x lead-out needles form an anode output array. Advantages: Since metal lines can be printed on each layer of the substrate and interconnected through vertical metallized through holes, the spacing of electrodes on both sides of the substrate can be made different. High-density matrix anode; using semiconductor manufacturing technology, the matrix anode produced has better consistency than traditional technology, which can improve the inhomogeneity of the anode response and increase production efficiency.

A photomultiplier excellent in vibration resistance and having an anode with good pulse linearity characteristic. The photomultiplier has a mesh anode (A) composed of an anode frame (A11) and a mesh electrode (A12) supported and surrounded by the anode frame (A11). The central portion of one long side (A11B) of the anode frame (A11) serves as an electron converging part (F). The inner side of the anode frame (A11) swells toward the inner part of the anode (A), more from the middle of the long side (A11B) toward the corners of the anode frame (A11) along the long side (A11B), and therefore the thickness of the anode frame (A11) increases from the middle of the long side (A11) to the corners along the long side (A11B).

A microchannel photomultiplier tube with composite waveguide anode for space optical communication belongs to the field of optoelectronic technology. The prior art requires the use of three optical antennas, which significantly increases the volume and weight of the optical transceiver, complicates the structure, and makes installation and adjustment very difficult. The components of the present invention include a window, a photocathode, a microchannel plate, and an anode. The microchannel plate has multiple levels, and a voltage with the same direction is applied between the photocathode, the microchannel plate of each level, and the anode, and the photocurrent is output by the anode; It is characterized in that the anode is composed of a transmissive anode, an anode microchannel plate, and a position-sensitive anode, the transmissive anode and the position-sensitive anode are respectively located on the front and back of the anode microchannel plate, and the electron beam focusing electrode is located on the last stage of the microchannel plate Between the transmissive anode and the transmissive anode, the laser communication signal photoelectric current is output from the transmissive anode, and the laser communication positioning photoelectric current is output from the position-sensitive anode. Combining fine tracking and communication into one reduces one optical antenna.

Disclosed is a photomultiplier of electrostatic focusing micro-channel plates. The photomultiplier comprises a photocathode, an electron multiplier, an anode, a focusing electrode, a power supply electrode and a support post supporting the focusing electrode, the electron multiplier and the anode; the focusing electrode, the electron multiplier and the anode are arranged in a glass vacuum container, and a signal lead of the anode and the power supply electrode penetrate through the glass vacuum container to be connected with an external circuit. The photomultiplier is characterized in that the focusing electrode, the electron multiplier and the anode are centrally coaxial; the electron multiplier consists of two pairs of micro-channel plates arranged in parallel and having a certain gap therebetween. Compared with the prior art, high gains and good single photoelectron spectra are realized by independently regulating the voltages of micro-channel plate assemblies at all levels.

The present invention relates generally to components of scientific analytical equipment. More particularly, but not exclusively, the invention relates to electron multipliers and modifications thereto for extending the operational lifetime or otherwise improving performance by way of improved construction. The invention may be embodied in the form of a detector comprising one or more electron emissive surfaces, the detector comprising one or more detector elements configured to define on one side an environment internal the detector and on the other side an environment external the detector,wherein the one or more detector elements are configured to inhibit or prevent flow of a gas from the environment external the detector to the environment internal the detector. Such detectors may beused in a mass spectrometry instrument.

The invention discloses an automatic expansion focusing electrode for a photomultiplier tube and a photomultiplier tube, wherein the automatic expansion focusing electrode comprises an expansion support rod, a metal cloth, a fixing mechanism, a rotating shaft and a touch spring. The expansion support rod, the rotating shaft and the touch spring piece are one-to-one corresponded, and are arranged around the fixing mechanism; A plurality of expansion struts rotatably mounted along an edge of the fixing mechanism and about the rotational axis; The metal cloth is arranged around the central axis of the fixing mechanism in an initial state of wrinkle folding, and each expansion rod is fixedly connected with the wrinkle edge position of the metal cloth, so that the metal cloth can be unfolded with the movement of the expansion rod to enter an expanded state. The automatic expansion focusing pole of the invention can realize the expansion action of the automatic expansion focusing pole and realize the expansion of the radial dimension of the focusing pole.