5 results about "Faraday cup" patented technology

The application discloses a kind of electron beam stream reaction lead barrels in the field of radiation protection, including lead barrel body, including butt joint lead barrel body and lead barrel cover, the side of the lead barrel body is equipped with beam entry;Functional insert, including frame and integrated on the frame beam flow diagnostic module, multiple reaction target pieces and magnetic coupling driving structure, the beam flow diagnostic module and multiple reaction target pieces are connected with magnetic coupling driving structure;By integrating all the vulnerable parts and commonly used replacement parts in one frame, the leakage risk caused by multiple dynamic sealing points in traditional design is eliminated using magnetic transmission, one drive shaft can realize faraday cup and fluorescent target detection switching and switching of reaction target sheets of different materials and thicknesses installed on multiple target seats of rotating drum, simple operation, low manufacturing cost, flexible application requirements of multi-task, multi-energy are adapted.

This invention relates to the field of mobile source exhaust particulate matter monitoring technology, and discloses a device and method for measuring the number concentration of nanoscale high-concentration particles based on condensation charging. The measuring device includes a volatile particle removal device, a two-stage condensation growth device, a unipolar charging device, and a dual-path Faraday cup detection device. Sample gas enters from the inlet of the volatile particle removal device, and the outlet of the volatile particle removal device is connected to the inlet of the two-stage condensation growth device; the outlet of the two-stage condensation growth device is connected to the inlet of the unipolar charging device; and the outlet of the unipolar charging device is connected to the inlet of the dual-path Faraday cup detection device. This invention overcomes the shortcomings of existing technologies, achieving efficient removal of volatile particles, high-concentration measurement, and a 10nm particle size detection limit without dilution for measuring the number concentration of ultrafine particulate matter in motor vehicle exhaust, greatly improving detection sensitivity and measurement accuracy.

The utility model discloses a charged ion current characteristic measuring device and an ion implanter. The charged ion current characteristic measuring device comprises a beam limiting plate and a Faraday cup insulated from the beam limiting plate, the beam limiting plate comprises an incident plane and an emergent plane, and a plurality of first through holes penetrating from the incident plane to the emergent plane are formed in the beam limiting plate; the Faraday cup is arranged on the emergent surface of the beam limiting plate, and the Faraday cup and the first through hole are oppositely arranged; and the driving mechanism is connected with the measuring assembly, and the driving mechanism is used for driving the measuring assembly to move and rotate so as to realize the detection of the characteristics of the charged ion current. According to the scheme of the utility model, the accuracy of measuring the characteristics of the charged ion current is high, and the detection efficiency is high.

A kind of high-power electron beam spot measurement method, comprising the following steps: Faraday cup moves along straight trajectory;Electron beam spot moves along circular trajectory intersecting with the straight trajectory for several rounds, and when electron beam spot meets Faraday cup in each round, the Faraday cup obtains the coordinates of several acquisition points and corresponding current signals;The beam spot characteristics of the electron beam spot are obtained based on the coordinates of each round acquisition point and corresponding current signals;The present application makes electron beam spot do circular motion, greatly shortens the moving distance and time of Faraday cup when collecting electron beam spot electron, improves the measurement efficiency, at the same time, Faraday cup only contacts electron beam spot when it rotates to straight trajectory each time, further reduces the time of Faraday cup exposed in electron beam spot, effectively avoids that Faraday cup is burnt out in the process of measurement, so that the measurement method can be applied to larger power electron beam spot.

The present application relates to the technical field of electron source performance test, in particular to a device for characterizing the charging behavior of inorganic non-metallic particles under electron beam charging and a method for evaluating the charge quantity thereof. The present application realizes high spatial resolution scanning of the electron beam on the inorganic non-metallic particles and efficient collection of the charging signal by means of coaxial precise alignment of the vacuum box, the electron emission source and the Faraday cup in combination with the micropore array at the receiving end of the Faraday cup, which not only avoids the shielding of the particles on the electron beam, but also ensures the high resolution of the electron beam. Furthermore, the design of the micropore array, the control of the vacuum degree and the optimization of the electron beam parameters are used to reduce signal interference, improve the consistency of the electron beam and eliminate background noise, which effectively guarantees the accuracy and reliability of the characterization results and provides an important technical means for the study of the charging behavior of inorganic non-metallic particles.