TY - GEN
T1 - Lidar requirements and approaches for transcontinental supersonic flight
AU - Rekhy, Anuj
AU - Shneider, Mikhail N.
AU - Miles, Richard
N1 - Publisher Copyright:
© 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2020
Y1 - 2020
N2 - The aim of this paper is to propose and investigate a dispersion filter approach similar to high spectral resolution lidar but for instantaneous measurements of temperature and wind velocities. Two schemes of lidar are investigated, a downward looking lidar and a forward looking lidar for measuring temperature and wind velocities in the direction of laser shot’s line of sight. The data from radiosonde archives are studied to draw statistical conclusions about atmospheric properties such as temperature, pressure and wind velocities. This is done to create a design space for all possible values a parameter can take, enabling modeling studies on lidar configurations. The lidar equation is used to analyse the number of back scattered photons collected by a telescope for both downward and forward looking lidar configurations. Laser wavelengths at 253.7 nm, 355 nm, 387.6 nm, 532nm and 780 nm are studied, this also helps to provide information on time resolution requirements on the collecting optics for a good signal. A sensitivity analysis is preformed in order to understand the effect of temperature and pressure perturbations on the Rayleigh Brillouin scattering line shapes from an atmosphere of pure nitrogen. A temperature and pressure sweep sensitivity analysis is performed to study the effect of temperature and pressure perturbations based on radiosonde data. The dispersion filter models are studied in detail for cesium at 387.6 nm and rubidium at 780 nm and these wavelengths can be accessed by a Ti:sapphire laser. The relationship between the vertical displacement and control parameters of the dispersion filter are studied. A schematic design for high spectral resolution dispersion lidar is proposed to employ this technique for lidar measurements, possibly leading to lower integration times compared to other technologies. We also show the detection scheme using a charged-coupled device array with a proof of concept simulation, which indicates that this technique has feasibility to measure both temperature and wind velocities simultaneously.
AB - The aim of this paper is to propose and investigate a dispersion filter approach similar to high spectral resolution lidar but for instantaneous measurements of temperature and wind velocities. Two schemes of lidar are investigated, a downward looking lidar and a forward looking lidar for measuring temperature and wind velocities in the direction of laser shot’s line of sight. The data from radiosonde archives are studied to draw statistical conclusions about atmospheric properties such as temperature, pressure and wind velocities. This is done to create a design space for all possible values a parameter can take, enabling modeling studies on lidar configurations. The lidar equation is used to analyse the number of back scattered photons collected by a telescope for both downward and forward looking lidar configurations. Laser wavelengths at 253.7 nm, 355 nm, 387.6 nm, 532nm and 780 nm are studied, this also helps to provide information on time resolution requirements on the collecting optics for a good signal. A sensitivity analysis is preformed in order to understand the effect of temperature and pressure perturbations on the Rayleigh Brillouin scattering line shapes from an atmosphere of pure nitrogen. A temperature and pressure sweep sensitivity analysis is performed to study the effect of temperature and pressure perturbations based on radiosonde data. The dispersion filter models are studied in detail for cesium at 387.6 nm and rubidium at 780 nm and these wavelengths can be accessed by a Ti:sapphire laser. The relationship between the vertical displacement and control parameters of the dispersion filter are studied. A schematic design for high spectral resolution dispersion lidar is proposed to employ this technique for lidar measurements, possibly leading to lower integration times compared to other technologies. We also show the detection scheme using a charged-coupled device array with a proof of concept simulation, which indicates that this technique has feasibility to measure both temperature and wind velocities simultaneously.
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U2 - 10.2514/6.2020-3241
DO - 10.2514/6.2020-3241
M3 - Conference contribution
AN - SCOPUS:85092613707
SN - 9781624105982
T3 - AIAA AVIATION 2020 FORUM
BT - AIAA AVIATION 2020 FORUM
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA AVIATION 2020 FORUM
Y2 - 15 June 2020 through 19 June 2020
ER -