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A Novel Micro-displacement Measuring Method Based on Optical Path Modulation

Chinese Physics Letters 2010年第7期27卷 119-122页

作者：曲伟叶红安 The Key Lab of Electronics Engineering College of Heilongjiang Province Heilongjiang University Harbin 150080 College of Electronic Engineering Heilongjiang University Harbin 150080

According to the interference theory of double-grating interferometers, the feature of Moire fringe imaging in each region is investigated and a novel micro-displacement measuring method based on optical path modulation is proposed. The basic measurement principle is that the displacement is measured through Moire fringe shifting, which is caused by the whole phased object thickness variation, in the case of non-relative movement of gratings. The object displacement measured can be changed into the phased object variation inserted in region Ⅱ using a mechanical arrangement. The principle of the micro-displacement measurement is analyzed theoretically. The light intensity of the distributing image in each interference region is given no matter whether we insert the phased object or not. The effect on the Moire fringe of the whole thickness variation of the phased object is also discussed. It is confirmed that the Moire fringe shifts with phased object variation by calculation with MATLAB. The experimental result proves that the resolution of this method is 2.1093 μm, and the resolution of the system is 0.5273μm after a four-subdivision circuit.

关键词： MODULATION theory electric displacement MOIRE topography INTERFEROMETERS MEASUREMENT OPTICAL properties electric interference

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Electron Emission Suppression from Cathode Surfaces of a Rod-Pinch Diode

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Chinese Physics Letters 2010年第5期27卷 160-163页

作者：高屹尹佳辉孙剑锋张众张鹏飞苏兆锋 Department of Engineering Physics Tsinghua University Beijing 100084 Northwest Institute of Nuclear Technology Xi'an 710024

The theory and method of suppressing electron emission from cathode surfaces is introduced, including increasing the emission threshold, reducing the surface electric field and shielding the emitted electrons. The stainless steel-graphite and Teflon-graphite composite cathodes are designed to test the above methods for a rod-pinch diode. The experiments are performed on the inductive voltage adder, and the results indicate that the Teflon-graphite composite cathode is effective in suppressing electron emission from the specified cathode surface, while the stainless steel-graphite composite cathode fails. The reasons are analyzed theoretically.

关键词： ELECTRON emission CATHODES DIODES SURFACES (Technology) electric fields COMPOSITE materials STAINLESS steel electric displacement

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PROBLEMS ON DEMONSTRATION OF THE electric FIELD PRODUCING THE MAGNETIC FIELD

PROBLEMS ON DEMONSTRATION OF THE ELECTRIC FIELD PRODUCING TH...

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1998 International Conference on Microwave and Millimeter Wave Technology

作者： Zeng Qingping Air Force Radar Academy

ISBN: (纸本)0780343085

It is all known,Maxwell had extended Faraday’s two expriments and reformed Ampere’s circuit law to have getten a celebrated thesis of induced magnetic field produced by time varying electric *** paper directs against the root of the formula▽×H=J,and to point out that:*** displacement doesn’t exist in our space,*** current is unwarranted, *** reformation is wrong,*** reformation is of no avail,*** is impossible that flow of electric field produces the induced magnetic field.

关键词： electric displacement displacement Current Ampere’s Circuit Law Induced Magnetic Field

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