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An automatic image alignment method applied to pressure sensitive paint measurements 一种用于压敏涂料测量的自动图像对准方法
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644658
Y. Le Sant, B. Deleglise, Y. Mébarki
{"title":"An automatic image alignment method applied to pressure sensitive paint measurements","authors":"Y. Le Sant, B. Deleglise, Y. Mébarki","doi":"10.1109/ICIASF.1997.644658","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644658","url":null,"abstract":"Pressure Sensitive Paint technique (PSP) uses images that have to be processed to calculate the pressure field on the model. There are two main issues in image processing. The first one is to recognize the model position in the image and the second one is to use this result to extract the useful information from the image. The presented method deals with these tasks. It requires markers on the model. They are filled circles that are detected with a dedicated function. They have then to be related to model markers. PSP technique provides a lot of images, so software has been written to work in an automatic mode. The camera attitude and location relative to the model are automatically recognized. The full software package enables one to process PSP images without human involvement.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114394389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 51
Comparisons between current high speed film and video recording 当前高速胶片和录像的比较
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644691
P. Fuller
{"title":"Comparisons between current high speed film and video recording","authors":"P. Fuller","doi":"10.1109/ICIASF.1997.644691","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644691","url":null,"abstract":"High speed film cameras have been used for observation and measurement in aerodynamic and aeroballistic facilities since these facilities were first introduced. Following an introduction, the paper outlines the basic mechanisms of high speed film and video recording bringing out the differences in the way in which the image is obtained and stored. This is followed by a brief history of the development of both systems. It goes on to describe the various types of video sensor and the way in which the signals obtained are stored, both temporarily and permanently. Mention is made of the way in which video recording has gradually moved into the high speed area. Comparisons are made between film and video in terms of information density and relative resolution and image blur. Short exposure time, still video is described and points made about the transformation of film to video images. A discussion of the special merits of film and video methods follows with comparisons. Finally a short summary is made of what the future may be for both methods of recording.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123193291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An analysis of CCD camera noise and its effect on pressure sensitive paint instrumentation system signal-to-noise ratio CCD摄像机噪声及其对压敏涂料仪表系统信噪比的影响分析
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644647
D. R. Mendoza
{"title":"An analysis of CCD camera noise and its effect on pressure sensitive paint instrumentation system signal-to-noise ratio","authors":"D. R. Mendoza","doi":"10.1109/ICIASF.1997.644647","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644647","url":null,"abstract":"Quantitative pressure measurements can be acquired by pressure sensitive paint (PSP) instrumentation systems incorporating charge-coupled devices (CCD) for PSP photoluminescence image detection. However, intrinsic CCD noise corrupts the PSP image, manifesting in erroneous measurements of pressure and the corresponding coefficient of pressure (C/sub p/). This manifestation is analyzed and quantified in terms of PSP image signal-to-noise ratio (SNR). The image acquisition and processing requirements maximizing a PSP image's SNR are determined. Specific attention is given to the PSP image calibration or flat fielding for CCD scene noise. This algebraic calibration is standard practice in quantitative CCD imaging. However, when applied to PSP images, subtleties arise due to the relative motion between wind-on and wind-off images used in the PSP ratio method. By averaging images and calibrating them for scene noise before ratioing, these subtleties are addressed and the following are true. The PSP C/sub p/ uncertainty will be determined by the image least averaged. Therefore, the mean flat field image must be based on 5 and 50 times more samples than the mean raw PSP image to be within 10% and 1% of the theoretically minimum uncertainty, respectively.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"79 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128898774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Digital particle image velocimetry system for real-time wind tunnel measurements 用于实时风洞测量的数字粒子图像测速系统
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644689
E. Arik, J. Carr
{"title":"Digital particle image velocimetry system for real-time wind tunnel measurements","authors":"E. Arik, J. Carr","doi":"10.1109/ICIASF.1997.644689","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644689","url":null,"abstract":"This paper describes a digital PIV system which is suitable for real-time acquisition and processing of planar velocity data in wind tunnels. After reviewing physical principals of PIV, some details of PIV hardware, programmable PIV processor, and software architecture are given, emphasizing the practical benefits of various features. This PIV system was used for studying the flowfield near the side of the body and aft of the wing flap of a 1:20 scale high wing transport with externally blown flaps (EBF) in a low speed wind tunnel facility having a 22 ft by 30 ft test section. A large data set of approximately six thousand vector maps, each having 47/spl times/29 2-D vectors, was recorded over three days. Preliminary flowfield measurements around an airplane model in a low speed wind tunnel are shown, including typical results showing velocity maps, and vorticity contours from the PIV data, and comparisons with five hole probe data from the same wind tunnel test.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127847663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Gas-surface-interaction measured by spectroscopy methods 用光谱学方法测量气体表面相互作用
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644750
C. Dankert, G. Gundlach, T. Pot, A. Mohamed, S. Novopashin
{"title":"Gas-surface-interaction measured by spectroscopy methods","authors":"C. Dankert, G. Gundlach, T. Pot, A. Mohamed, S. Novopashin","doi":"10.1109/ICIASF.1997.644750","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644750","url":null,"abstract":"The interaction of N/sub 2/- and NO-molecules of high kinetic energy colliding with a solid wall is investigated by two spectroscopic methods: laser induced fluorescence (LIF) and electron beam fluorescence (EBF). They allow one to measure the population of rotational levels of the molecules, which is necessary to define the rotational temperatures of the incoming (undisturbed) and the reflected (coming back from the wall) molecules. Using pure test gases N/sub 2/ or NO or NO/N/sub 2/ mixtures provides flow velocities from 800 to 1500 m/s in a supersonic free jet expansion; seeding with light gas like He accelerates the flowing molecules up to 3000 m/s. The experimental results show a strong influence of the kinetic energy of the incoming flow, a minor influence of the wall temperature, a minor influence of the wall materials except for the combination NO on Pt, and an influence of the Knudsen number except for the free molecular conditions.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134178830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface temperature mapping using liquid crystals applied to identifying the laminar-turbulent transition 表面温度测绘应用于识别层流-湍流过渡的液晶
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644665
D. Bize, C. Lempereur, J. Mathé, A. Mignosi, A. Séraudie, G. Serrot
{"title":"Surface temperature mapping using liquid crystals applied to identifying the laminar-turbulent transition","authors":"D. Bize, C. Lempereur, J. Mathé, A. Mignosi, A. Séraudie, G. Serrot","doi":"10.1109/ICIASF.1997.644665","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644665","url":null,"abstract":"The determination of the transonic position on a two dimensional model is an important subject of studies in the ONERA-CERT T2 cryogenic wind tunnel. The use of liquid crystals with a specific methodology of calibration, acquisition and image processing allowed one to go beyond the usual stage of qualitative imaging and to determine the temperature map on the surface of the model, the variation in time of this temperature and to know the precise location of the laminar/turbulent transition.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116495076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Current state and potentialities of hypersonic MHD-gas acceleration wind tunnels 高超声速mhd气体加速风洞的现状与潜力
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644763
V.I. Alfyorov
{"title":"Current state and potentialities of hypersonic MHD-gas acceleration wind tunnels","authors":"V.I. Alfyorov","doi":"10.1109/ICIASF.1997.644763","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644763","url":null,"abstract":"Developments of hypersonic wind tunnels with MHD-gas accelerators were initiated late in the 1950s when limited capabilities of classical hypersonic wind tunnels based on the test gas acceleration due to its adiabatic expansion became obvious. These studies were started almost at the same time in the USA (NASA, Langley Research Center, AEDS, General Electric Company) and in Russia (TsAGI). Some works were carried out in France (ONERA) and in Germany. The present review analyzes different designs of this facility. Main characteristics of the hypersonic wind tunnel of TsAGI and the results of its application to solve practical problems of aerodynamics are considered. The flow conditions over bodies in a free flight are compared with those realized experimentally in the test section of the facility at the same flow velocities of V/spl sim/8 km/s. The advantage of applying MHD-gas acceleration facilities to solve problems of developing and testing scramjets for TAV vehicles is demonstrated and the data on possible gas dynamic and electrodynamic parameters of these facilities and their design versions are presented. Finally, basic problems to be solved in developing hypersonic MHD-gas acceleration facilities are listed.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126692133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Phase measurements with reduced sensitivity of a supersonic shock flow by two-wavelength dual hologram shearing interference technique 用双波长双全息图剪切干涉技术测量低灵敏度超音速激波的相位
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644694
G. Toker, D. Levin, A. Lessin
{"title":"Phase measurements with reduced sensitivity of a supersonic shock flow by two-wavelength dual hologram shearing interference technique","authors":"G. Toker, D. Levin, A. Lessin","doi":"10.1109/ICIASF.1997.644694","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644694","url":null,"abstract":"A novel two-wavelength technique has been applied to holographic shearing interferometry of shock wave flows around sharp and blunt nose cone models in a supersonic wind tunnel. The technique with reduced sensitivity and practically full compensation for optical aberrations, makes it possible to eliminate the difficulties of interference analysis of areas where step discontinuities in the density gradients occur. Such a case takes place in the region near the bow shock. Reconstructed lateral shearing interferograms with reduced sensitivity having a maximal fringe shift less than unity, could be used to conduct simplified numerical analysis of the density gradient distribution in the vicinity of the nose of models, without any complementary assumptions.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126737747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Measurement methods and properties of anisotropic flows excited by bulk force 体力激励下各向异性流动的测量方法及特性
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644685
Y. Kolesnikov, O. Andreev
{"title":"Measurement methods and properties of anisotropic flows excited by bulk force","authors":"Y. Kolesnikov, O. Andreev","doi":"10.1109/ICIASF.1997.644685","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644685","url":null,"abstract":"This paper presents a potential-difference method for experimental measurement of velocity characteristics in stable (unstable) shear flows and vortex structures generated in liquid metal by electromagnetic force in an external uniform magnetic field. These include averaged velocity and stream-function distributions, perturbation intensities and spectra and relations allowing estimation of the relative error for the relevance of the method. Using in this work a magnetic method allows measurement of drag coefficient at overflow a body; experiments with a cylinder parallel to the field at no large MHD interaction parameter are in good agreement with known works on investigation of cylinder drag coefficient without magnetic field. The method discovers a considerable decrease of cylinder drag coefficient at moderate this parameter. In order to study the dynamics of large-scale geostrophic nature flows in MHD laboratory scale, we performed a correlation of governing parameters and compared their values in these both cases. The results confirm a possibility of modelling of these flows.","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125621236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DLR PSP system intensity and lifetime measurements DLR PSP系统强度和寿命测量
ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities Pub Date : 1997-09-29 DOI: 10.1109/ICIASF.1997.644654
R. Engler, C. Klein
{"title":"DLR PSP system intensity and lifetime measurements","authors":"R. Engler, C. Klein","doi":"10.1109/ICIASF.1997.644654","DOIUrl":"https://doi.org/10.1109/ICIASF.1997.644654","url":null,"abstract":"DLR started at 1995 with there own PSP activities. A phase of extensive exploration of hard- and software components followed and internal measurements using the intensity and lifetime method which includes spectra, calibration curves, etc. were performed. A repeatability study was made on the DASA HYTEX model, comparing the Inteco OPMS measurements from 1992/94 with the now existing DLR PSP system. Therefore, different lamps and laser illumination systems were tested. This included several cameras (intensified CCD and non-intensified CCD) for comparison of different paint samples in an external calibration chamber. After these pre-tests in the calibration chamber, measurements were performed in the Transonic Wind Tunnel Gottingen (TWG).","PeriodicalId":122871,"journal":{"name":"ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128888313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
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