Ultraviolet spherical micro-channel plate photo counting and imaging detector

Abstract

The invention relates to an ultraviolet spherical micro-channel plate photo counting and imaging detector. The ultraviolet spherical micro-channel plate photo counting and imaging detector comprises an photoelectric cathode, a micro-channel plate, a position sensitive anode, an input window, a metal output window, a position reading circuit and a computer image output circuit, wherein the photoelectric cathode, the micro-channel plate and the position sensitive anode are arranged in a vacuum shell from top to bottom; the input window is arranged at the front end of the vacuum shell; the metal output window is arranged at the rear end of the vacuum shell and provided with a metal output electrode; the position reading circuit and the computer image output circuit are placed on the outer portion of the vacuum shell. The input window is connected with the vacuum shell and the metal output window in a sealed mode to form a vacuum airtight structure which is integrally formed. A layer of conductive thin capable of allowing ultraviolet rays to transmit is plated on the inner surface of the input window and the photoelectric cathode is manufactured on the conductive film. The input window and the micro-channel plate are in the shape of convex spherical faces with the curvature radius being the same. The ultraviolet spherical micro-channel plate photo counting and imaging detector can reduce the spherical aberration of a large-view-field imaging system and improve the imaging quality of the system, and can be used as a single-photo counting detector. The ultraviolet spherical micro-channel plate photo counting and imaging detector has single-photo sensitivity and meanwhile, an ultraviolet cathode has very low noise.

Description

Technical field [0001] The invention belongs to the technical field of ultraviolet detection, and can be used for ultraviolet space astronomy, ultraviolet space detection, ultraviolet warning, forest fire monitoring, high-voltage line spark discharge detection, etc.; specifically, it relates to an ultraviolet spherical microchannel plate photon counting imaging detection Device. Background technique [0002] The planar microchannel plate is a two-dimensional continuous electron multiplying electric vacuum device, which is composed of many channels with continuous electron multiplying ability arranged in a certain geometric pattern. Applying a certain voltage to both ends of it can obtain a high electronic gain, which can multiply and amplify the extremely weak two-dimensional electronic image. At present, the microchannel plate is mainly used in the fields of photon counting imaging detection and low-light night vision imaging. The position-sensitive photon counting imaging dete...

AI Technical Summary

Problems solved by technology

The invention patent No. 200810184963.6 relates to a photon counting imaging method that uses a semiconductor layer to receive electron clouds from a microchannel plate, and induces charge pulses on a position sensitive anode placed outside the sealed tube body. This method avoids the The image nonlinearity caused by the secondary electrons generated by the direct interaction between the electron cloud and the metal anode, but since the sealed tube body uses a substrate coated with a semiconductor layer as the output window, and the optimum thickness of the output window is only 1mm, it is necessary to use The application of large-diameter micro-channel plates is not suitable; at the same time, the invention only involves planar detectors and is not suitable for imaging systems with large fields of view

The authorized invention patent with the patent number of 200710018631.6 also only involves the planar photon counting imaging detector that uses the metal position-sensitive anode located inside the sealed tube to directly receive the electron cloud of the microchannel plate, and the secondary electron cloud generated by the direct interaction between the electron cloud and the metal anode Image nonlinearity caused by electrons

Images