Optical doppler measurement of microscale wind velocity

Owens, James C.

doi:10.1109/proc.1969.7006

Cited by 14 publications

(11 citation statements)

References 13 publications

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“…(Note that N(r, z) is a probability distribution, thus, the probability of finding a number density of exactly r size is vanishingly small and can only be specified within a Ar/2 increment.) z is related to the range through z = R sin<£ (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) where 0 is the angle between the transmission axis and the horizontal. It has been shown (Ref.…”

Section: Collected Power Scattered As a Function Of Rangementioning

confidence: 99%

“…The atmospheric transmission factor T is given by T = e-£' R (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) where ß' may be taken as constant for R < 2km. A more detailed calculation would show its dependence on z, r, N(r, z), etc.…”

Section: Aedc-tr-74-26mentioning

confidence: 99%

“…-.. %<« -#♦ *■» (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) From Eq. (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), noting that for most LV systems d and b are essentially independent of R and therefore constant it may be concluded that for short ranges, (R < 0. 5 km, which is the case of interest), and at low altitudes (z < 1 km) there is practically no P s dependence on range.…”

Section: Aedc-tr-74-26mentioning

confidence: 99%

“…The instantaneous power scattered by a single SC in the probe volume is given by Pj = Io"i TO (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21) where I 0 , ft, and T are the same as defined previously, o^ is the average Mie backscattering cross section for a single particle in the Junge distribution. From Eq.…”

Section: Aedc-tr-74-26mentioning

confidence: 99%

“…Atmospheric transmission effects are accounted for in the exponential term where the attenuation constant Aß' is given by A0' = PDS -01.0 (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) Usually ß' decreases with increasing wavelength. Thus, a gain in scatter cross section due to a decrease in wavelength is offset by a reduction in transmittance through the atmosphere.…”

Section: A(y) / a Cos [Acos (Rp) R -A]damentioning

confidence: 99%

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Application of the Laser Velocimeter for Trailing Vortex Measurements

Lennert¹,

Crosswy²,

Kalb³

1974

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Approved for public release; distribution unlimited. '7 DISTRIBUTION STATEMENT (of the abstract entered in Block 20, II dillerenl from Report) IB SUPPLEMENTARY NOTES Available in DDC KEY WORDS (Continue on reverie side It necessary and Identity by block number)lasers cells (Bragg) signal to noise ratio speed indicators instruments (electronic) measurements aircraft density vortexes (trailing) ABSTRACT ("Continue on reverse side // necessary and identity by block number)This report summarizes a three-year analytical and experimental program to develop a dual-scatter laser velocimeter system to map the flow fields of trailing vortices stemming from the wingtips of flying aircraft. The basic design parameters ascertaining feasibility of the LV-measuring technique are presented.Included is a discussion and evaluation of a newly developed two-dimensional Bragg cell (TDBC) for resolving direc-DD i JAN"73 1473 EDITION OF 1 NOV 65 IS OBSOLETE UNCLASSIFIED UNCLASSIFIED 20. Abstracttional ambiguity. The electronics instrumentation developed for the operation of the TDBC is evaluated in detail. In addition, the development of a direct readout system yielding considerable improvement over the initial instrument is described and evaluated. A number of significant proof-of-principle experiments made at the AEDC runway of trailing vortices created by NASA-operated aircraft are discussed and evaluated. The conclusions derived from the test programs are enumerated, and a conceptual design of a mobile trailing-vortex-measuring system is described.

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Section: Collected Power Scattered As a Function Of Rangementioning

confidence: 99%

Section: Aedc-tr-74-26mentioning

confidence: 99%

Section: Aedc-tr-74-26mentioning

confidence: 99%

Section: Aedc-tr-74-26mentioning

confidence: 99%

Section: A(y) / a Cos [Acos (Rp) R -A]damentioning

confidence: 99%

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Application of the Laser Velocimeter for Trailing Vortex Measurements

Lennert¹,

Crosswy²,

Kalb³

1974

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Long range anemometry using a CO2 laser

Hughes¹,

O'Shaughnessy²,

Pike³

et al. 1972

Opto-electronics

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Atmospheric optics and radiative transfer

Howard

Garing

1971

EoS Transactions

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The area of atmospheric optics has continued to flourish and burgeon. When we compiled this report four years ago we screened 400 titles for inclusion; this time the number increased to over 900 items, which were found chiefly by checking the contents lists of the five principal journals and utilizing abstracting journals for the rest. We retained about 750 in the bibliography, including a few reports that are available from the Clearinghouse for Scientific and Technical Information, Springfield, Virginia. We omitted most papers relating to the construction or calibration of equipment for atmospheric optical studies. Many papers appeared during this time period on the atmospheres of other planets; we included only papers closely related to the terrestrial atmosphere.

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Optical doppler measurement of microscale wind velocity

Cited by 14 publications

References 13 publications

Application of the Laser Velocimeter for Trailing Vortex Measurements

Application of the Laser Velocimeter for Trailing Vortex Measurements

Long range anemometry using a CO2 laser

Atmospheric optics and radiative transfer

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