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Advances in critical technologies for hypersonic and high-enthalpy wind tunnel

Chinese Journal of Aeronautics 2020年第12期33卷 3027-3038页

作者： Zonglin JIANG Zongmin HU Yunpeng WANG Guilai HAN State Key Laboratory of High-temperature Gas Dynamics(LHD) Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Hypersonic and high-enthalpy wind tunnels and their measurement techniques are the cornerstone of the hypersonic flight era that is a dream for human beings to fly faster,higher and *** great progress has been achieved during the recent years and their critical technologies are still in an urgent need for further *** are at least four kinds of hypersonic and high-enthalpy wind tunnels that are widely applied over the world and can be classified according to their operation *** wind tunnels are named as air-directly-heated hypersonic wind tunnel,light-gas-heated shock tunnel,free-piston-driven shock tunnel and detonation-driven shock tunnel,*** critical technologies for developing the wind tunnels are introduced in this paper,and their merits and weakness are discussed based on wind tunnel performance *** techniques especially developed for high-enthalpy flows are a part of the hypersonic wind tunnel technology because the flow is a chemically reacting gas motion and its diagnosis needs specially designed *** kinds of the measurement techniques considered to be of primary importance are introduced here,including the heat flux sensor,the aerodynamic balance,and optical diagnosis *** techniques are developed usually for conventional wind tunnels,but further improved for hypersonic and high-enthalpy *** hypersonic ground test facilities have provided us with most of valuable experimental data on high-enthalpy flows and will play a more important role in hypersonic research area in the ***,several prospects for developing hypersonic and high-enthalpy wind tunnels are presented from our point of view.

关键词： High-enthalpy flow Hypersonic wind tunnel Aerospace vehicle Aerodynamic balance Heat flux sensor optical measurement technique

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MEMS Test System Based on Virtual Instrument Technology

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Transactions of Tianjin University 2007年第2期13卷 88-92页

作者：胡晓东栗大超郭彤胡春光胡小唐 State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University

On account of the multiformity of MEMS devices, it is necessary to integrate with some optical measurement techniques for meeting static and dynamic unit test requirements. In this paper, an automated MEMS test system is built of some commercially available components and instruments based on virtual instrument technology. The system is integrated with stroboscopic imaging, computer micro-vision, microscopic Mirau phase shifting interferometry, and laser Doppler vibrometer, and is used for the measurement of full-view in-plane and out-of-plane geometric parameters and periodical motions and single spot out-of-plane transient motion. The system configuration and measurement methods are analyzed, and some applications of the measurement of in-plane and out-of-plane dimensions and motions were described. The measurement accuracy of in-plane dimensions and out-of-plane dimensional is better than 0.2 um and 5 nm respectively. The resolution of measuring in-plane and out-of-plane motions is better than 15 nm and 2 nm respectively.

关键词： MEMS optical measurement technique stroboscopic imaging virtual instrument dynamic test

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维普期刊数据库

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Degenerate four-wave mixing measurement in iodine vapor

Degenerate four-wave mixing measurement in iodine vapor

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2008 International Conference on optical Instruments and Technology

作者： Wei-Bo~(ab) WANG De-Ying~(a*)CHEN Rong-Wei~a FAN Jun YANG~a a Institute of Opto-Electronics,Harbin Institute of Technology China b Department of Physics,Harbin Normal University China

Degenerate four-wave mixing(DFWM)is a nonlinear optical process that has been developed as a detective tool for making quantitative measurements of gas dynamic properties in the various environments. This technique can be used to measure temperature and species concentration in both flames and plasma *** resulting coherent signal beam makes DFWM particularly attractive for luminous and harsh environments,compared to incoherent techniques,such as laser-induced fluorescence(LIF).Forward DFWM with self-stability of spilt-beam system has been demonstrated in iodine ***’s found that there exists no LIF because of collision quenching at atmospheric pressure and room *** observed vivid DFWM spectroscopy(554-556nm)of iodine vapor at 0℃and room ***, DFWM can probe non-fluorescing *** describe a novel advanced sensor method for measuring temperature of gas flows using *** technique without suffering of severe quenching problems at atmospheric pressure is of importance to trace atom,molecular and radical in combustion diagnosis.

关键词： optical measurement technique nonlinear laser spectroscopy DFWM atmospheric pressure Iodine vapor

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