Analysis of Atmospheric Laser Doppler Velocimeters

Farmer, William M.; Brayton, D. B.

doi:10.1364/ao.10.002319

Cited by 40 publications

(3 citation statements)

References 4 publications

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“…b denotes the relative magnitude ofF AC ðk x Þ. If the particles can be approximated as microspheres, b can be estimated as 11,12 b ≈ 2J 1 ðπs∕dÞ ffiffiffiffi N p ðπs∕dÞ ;…”

Section: Methodsmentioning

confidence: 99%

Calibration-free structured-illumination photoacoustic flowgraphy of transverse flow in scattering media

Yao¹,

Gilson

Maslov

et al. 2014

J. Biomed. Opt

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Abstract. We propose a calibration-free photoacoustic (PA) method for transverse flow measurements. In this method, a pulsed periodically structured (i.e., grating patterned) optical beam is used to illuminate flowing absorptive particles in an optically scattering medium. The PA signal amplitudes measured over consecutive laser pulses carry an imprint of the illumination structure. The modulation frequency of the imprint is proportional to the component of the flow speed projected onto the normal axis of the striped illumination pattern. This method can tolerate high particle density, and is insensitive to the particle size, thus calibration-free. Bovine blood and microsphere phantoms were used to validate the proposed method. Blood flow in a mouse ear was measured in vivo as well.

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“…b denotes the relative magnitude ofF AC ðk x Þ. If the particles can be approximated as microspheres, b can be estimated as 11,12 b ≈ 2J 1 ðπs∕dÞ ffiffiffiffi N p ðπs∕dÞ ;…”

Section: Methodsmentioning

confidence: 99%

Calibration-free structured-illumination photoacoustic flowgraphy of transverse flow in scattering media

Yao¹,

Gilson

Maslov

et al. 2014

J. Biomed. Opt

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“…Analogous to Eq. (12), the visibility function for N particles in the probe volume is defined as -<Ps> (13) where Pgf and Pj are the respective a-c and d-c signal power collected for N particles in the focal volume. It has been shown (Ref.…”

Section: Determination Of Number Density From Visibility Measurementsmentioning

confidence: 99%

Interferometric Instrumentation for Particle Size Analysis

Roberds¹,

Farmer²,

Lennert³

1975

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When U. S. Government drawings specifications, or other data are used for any purpose other than a definitely related Government procurement operation, the Government thereby incurs no responsibility nor any obligation whatsoever, and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data, is not to be regarded by implication or otherwise, or in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. Qualified users may obtain copies of this report from the Defense Documentation Center. References to named commercial products in this report are not to be considered in any sense as an endorsement of the product by the United States Air Force or the Government. This report has been reviewed by the Information Office (01) and is releasable to the National Technical Information Service (NTIS). At NTIS, it will be available to the general public, including foreign nations. APPROVAL STATEMENT This technical report has been reviewed and is approved for publication. FOR THE COMMANDER

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“…Demonstrated ranges of several hundred meters indicate the technique may have application in air pollution meteorology. A Doppler wind measurement that does not require a local oscillator reference has also been described (Farmer and Brayton, 1971).…”

Section: Wind Sensing a Wind Measurements With Lasersmentioning

confidence: 99%