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pro vyhledávání: '"Joel M. Lawson"'
Focused laser differential interferometry (FLDI) is used to make freestream density fluctuation measurements in the von Kármán Gas Dynamics Facility (VKF) Wind Tunnel D at Arnold Engineering Development Complex. A comparison is made between pitot-p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cee9126e45e1afc57d9c5f84d56f6699
https://resolver.caltech.edu/CaltechAUTHORS:20220705-346707000
https://resolver.caltech.edu/CaltechAUTHORS:20220705-346707000
Autor:
Joel M. Lawson, Joanna M. Austin
Publikováno v:
Applied Optics. 62:3042
Focused laser differential interferometry (FLDI) measures the phase shift corresponding to localized fluctuations in the refractive index of a medium. The sensitivity, bandwidth, and spatial filtering properties of FLDI make it particularly suited to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dccdd05374bc3d78347d27ba2e9f7de0
https://doi.org/10.1364/ao.480352
https://doi.org/10.1364/ao.480352
Autor:
Joel M. Lawson, Joanna M. Austin
Publikováno v:
Applied Optics. 62:3054
An exact analytical method for recovering density disturbance spectra in multi-frequency, multi-dimensional fields from focused laser differential interferometry (FLDI) measurements, developed in Part 1 [Appl. Opt. 62, 3042 (2023)APOPAI0003-693510.13
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ea6d8805fb6360f5ef3cdfc8a2f5307
https://doi.org/10.1364/ao.480354
https://doi.org/10.1364/ao.480354
Autor:
Joanna Austin, Peter Finch, Julian J. Girard, Ronald K. Hanson, Joel M. Lawson, Tal Schwartz, Hans G. Hornung, Christopher L. Strand, Wesley Y. Yu
Publikováno v:
AIAA Propulsion and Energy 2021 Forum.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f9be6c834f832736475c3058791c213
https://doi.org/10.2514/6.2021-3524
https://doi.org/10.2514/6.2021-3524
Publikováno v:
Experiments in Fluids. 61
A focused laser differential interferometer (FLDI) is experimentally characterized via static and dynamic benchtop testing. The static response is probed using a steady, laminar helium jet, and the dynamic response is investigated using an ultrasonic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3a86f6126e8331c65905410bbfa41b91
https://doi.org/10.1007/s00348-020-03013-6
https://doi.org/10.1007/s00348-020-03013-6
Expansion Tube Freestream Disturbance Measurements using a Focused Laser Differential Interferometer
Autor:
Joel M. Lawson, Joanna Austin
Publikováno v:
AIAA Scitech 2020 Forum.
A focused laser differential interferometer (FLDI) is applied to Caltech's Hypervelocity Expansion Tube (HET). FLDI is shown to be sensitive enough to make high-bandwidth measurements of flow features at low-density conditions. The freestream disturb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c154aa03075aa8abc53a1ab56b0a116f
https://doi.org/10.2514/6.2020-1064
https://doi.org/10.2514/6.2020-1064
A focused laser differential interferometer (FLDI) has been experimentally characterized. The static response was probed using a steady, laminar helium jet, and the dynamic response was investigated using a free ultrasonic acoustic beam. In the case
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a1e758a75e768a172448cc7f389a5b7
https://resolver.caltech.edu/CaltechAUTHORS:20200806-124527212
https://resolver.caltech.edu/CaltechAUTHORS:20200806-124527212
Autor:
Joanna Austin, Joel M. Lawson
Publikováno v:
Measurement Science and Technology. 32:055203
The focused laser differential interferometer (FLDI) can be used to measure rapid density fluctuations non-intrusively in high-speed flow applications. Being a non-imaging shearing interferometer, FLDI response can be accurately modeled using a parax
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::661937e582ed304ae0e4bf5d176635a2
https://doi.org/10.1088/1361-6501/abdbd3
https://doi.org/10.1088/1361-6501/abdbd3
Autor:
Joanna Austin, Joel M. Lawson
Publikováno v:
2018 Aerodynamic Measurement Technology and Ground Testing Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a08aaa9a7191d336dec478e7caea7e2b
https://doi.org/10.2514/6.2018-3566.c1
https://doi.org/10.2514/6.2018-3566.c1
Autor:
Joel M. Lawson, Joanna Austin
Freestream disturbances can have a significant impact on studies of boundary layer transition in ground tests, including experiments in high-enthalpy hypersonic facilities such as an expansion tube. Freest ream noise reduction in expansion tubes can
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::944ac395fbc36aef838118a2cf6d79a5
https://resolver.caltech.edu/CaltechAUTHORS:20190816-105723199
https://resolver.caltech.edu/CaltechAUTHORS:20190816-105723199