Flow field imaging through sharp-edged atomic and molecular `notch' filters

Sharp edged notch filters made of rubidium, iodine or mercury vapor are used to image shock wave and boundary layer structure by Rayleigh scattering from particles, to image gas pressure, velocity, and temperature by molecular Rayleigh scattering, and to measure electron temperature and electron num...

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Bibliographic Details
Published in:Measurement science & technology 2001-04, Vol.12 (4), p.442-451
Main Authors: Miles, Richard B, Yalin, Azer P, Tang, Zhen, Zaidi, Sohail H, Forkey, Joseph N
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Optical elements, devices, and systems
Optical instruments, equipment and techniques
Optics
Physics
Range finders, remote sensing devices, laser doppler velocimeters, sar, and lidar
Visible and ultraviolet spectrometers
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Summary:Sharp edged notch filters made of rubidium, iodine or mercury vapor are used to image shock wave and boundary layer structure by Rayleigh scattering from particles, to image gas pressure, velocity, and temperature by molecular Rayleigh scattering, and to measure electron temperature and electron number density by Thomson scattering. For molecular scattering, filter transmission is generally a function of velocity, temperature and pressure, but, under some circumstances, it is a function of only one or two variables, so a notch filter can provide single-pulse images of a specific flow field parameter. (Author)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/12/4/308