Flow measurements based on Rayleigh scattering and Fabry-Perot interferometer

Seasholtz, Richard G.; Buggele, A. E.; Reeder, Mark F.

doi:10.1016/s0143-8166(96)00063-2

Cited by 53 publications

(23 citation statements)

References 15 publications

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“…The clean air was routed via a flexible duct and exhausted vertically at a very low speed (~ 8 m/s) through a 30.5cm X 38cm hood over the nozzle block (figs. 5,6). The clean air from the hood flows in a vertical direction, normal to the main jet, and in effect, creates a crossflow situation.…”

Section: Methodsmentioning

confidence: 99%

Velocity and temperature measurement in supersonic free jets using spectrally resolved Rayleigh scattering

Panda¹,

Seasholtz

1999

37th Aerospace Sciences Meeting and Exhibit

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Section: Methodsmentioning

confidence: 99%

Velocity and temperature measurement in supersonic free jets using spectrally resolved Rayleigh scattering

Panda¹,

Seasholtz

1999

37th Aerospace Sciences Meeting and Exhibit

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“…For 2d measurements, an FPI with planar mirrors can be used. Examples for such measurements are reported for Rayleigh scattering [12] and the fluid motion of the self-glowing Sun [41]. In 2013, Büttner et al presented 1d flow measurements based on Mie scattering, but only for seven pixels [42].…”

Section: Amplitude-based Signal Evaluationmentioning

confidence: 99%

“…As the size of the fluid atoms or molecules in the order of 0.1 nm is significantly smaller than the wavelength of visible light (0.4 µm-0.8 µm), the light scattering is so-called Rayleigh scattering. Optical flow velocity measurements based on Rayleigh scattering are described for instance in [11][12][13][14][15][16][17]. An overview article exists from Miles, 2001 [18].…”

Section: Introductionmentioning

confidence: 99%

Imaging Flow Velocimetry with Laser Mie Scattering

Fischer

2017

Applied Sciences

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Abstract:Imaging flow velocity measurements are essential for the investigation of unsteady complex flow phenomena, e.g., in turbomachines, injectors and combustors. The direct optical measurement on fluid molecules is possible with laser Rayleigh scattering and the Doppler effect. However, the small scattering cross-section results in a low signal to noise ratio, which hinders time-resolved measurements of the flow field. For this reason, the signal to noise ratio is increased by using laser Mie scattering on micrometer-sized particles that follow the flow with negligible slip. Finally, the ongoing development of powerful lasers and fast, sensitive cameras has boosted the performance of several imaging methods for flow velocimetry. The article describes the different flow measurement principles, as well as the fundamental physical measurement limits. Furthermore, the evolution to an imaging technique is outlined for each measurement principle by reviewing recent advances and applications. As a result, the progress, the challenges and the perspectives for high-speed imaging flow velocimetry are considered.

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“…Iodine vapor filters are often used because of their strong absorption features in the visible with transitions from strong absorption to full transmission for frequency ranges of ± 1 GHz (± 0.03 cm -1 ). Molecular filters are also useful for filtering laser light scattered from surfaces in Rayleigh scattering experiments in wind tunnels or other enclosed experiment chambers 5 .…”

mentioning

confidence: 99%

“…Although single-point time-resolved measurements are quite useful, there are many situations that would benefit from multiple-point measurements, especially if these can be acquired at high sampling rates. Spatially-resolved measurements have been obtained by imaging scattered light from a laser line or sheet directly through the etalon 5,11,12 .…”

mentioning

confidence: 99%

Multiple-Point Mass Flux Measurement System Using Rayleigh Scattering

Mielke

Elam

Clem

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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[Abstract] A multiple-point Rayleigh scattering diagnostic is being developed to provide mass flux measurements in gas flows. Spectroscopic Rayleigh scattering is an established flow diagnostic that has the ability to provide simultaneous density, temperature, and velocity measurements. Rayleigh scattered light from a focused 18 Watt continuous-wave laser beam is directly imaged through a solid Fabry-Perot etalon onto a CCD detector which permits spectral analysis of the light. The spatial resolution of the measurements is governed by the locations of interference fringes, which can be changed by altering the etalon characteristics. A prototype system has been used to acquire data in a Mach 0.56 flow to demonstrate feasibility of using this system to provide mass flux measurements. Estimates of measurement uncertainty and recommendations for system improvements are presented.

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Flow measurements based on Rayleigh scattering and Fabry-Perot interferometer

Cited by 53 publications

References 15 publications

Velocity and temperature measurement in supersonic free jets using spectrally resolved Rayleigh scattering

Velocity and temperature measurement in supersonic free jets using spectrally resolved Rayleigh scattering

Imaging Flow Velocimetry with Laser Mie Scattering

Multiple-Point Mass Flux Measurement System Using Rayleigh Scattering

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