Velocity and NO-Lifetime Measurements in an Unseeded Hypersonic Air Flow

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Pedro A. de S. Matos ◽  
Luiz G. Barreta ◽  
Cristiane A. Martins
Keyword(s):  
Nitric Oxide ◽  
Systematic Error ◽  
Experimental Test ◽  
Laser Induced Fluorescence ◽  
Velocity Measurements ◽  
Error Sources ◽  
Lifetime Measurements ◽  
Hypersonic Shock ◽  
Linear Fit ◽  
Hypersonic Shock Tunnel

A laser-induced fluorescence (LIF)-based nitric-oxide flow-tagging technique was applied to measure both velocity and NO lifetime in a hypersonic shock tunnel from two experimental test runs. The results were supported by an analytical profile proposed in this paper that provides a way to correct velocity measurements under unknown systematic error sources. This procedure provided velocities with discrepancies lower than 3% for a total of five measurements, and lower than 2% when compared with that obtained from a linear fit. Additionally, the comparison between the proposed and experimental profiles allowed us to obtain the fluorescence NO lifetime from only one image.

Experimental Study at Hypersonic Shock Tunnel of A 3D Prototyped Scramjet Powered with Hydrogen

2020 ◽  
Author(s):  
Ronaldo Cardoso ◽  
Paulo Toro ◽  
Israel Rêgo ◽  
Thiago Victor Cordeiro Marcos ◽  
Pedro Souza
Keyword(s):  
Experimental Study ◽  
Shock Tunnel ◽  
Hypersonic Shock ◽  
Hypersonic Shock Tunnel

Initial Alignment of a Moving Inertial Navigation System

1960 ◽  
Vol 13 (3) ◽  
pp. 301-315
Author(s):  
Richard B. Seeley ◽  
Roy Dale Cole
Keyword(s):  
Navigation System ◽  
Inertial Navigation System ◽  
Local Level ◽  
Inertial Navigation ◽  
Navigation Systems ◽  
Velocity Measurements ◽  
Initial Alignment ◽  
Inertial Navigation Systems ◽  
Error Sources ◽  
China Lake

This paper describes and discusses some of the techniques by which a moving inertial platform may be aligned by using external velocity measurements and also presents some of the major problems and error sources affecting such alignment. It is based upon the results of a 3-year study, of inertial and doppler-inertial navigation at the Naval Ordnance Test Station, China Lake, California, and, in general, applies to inertial navigation systems which erect to either the local level or the mass-attraction vertical. Although rudimentary derivations are made of the alignment techniques, the paper is largely nonmathematical for ease of reading. Emphasis is placed upon the major errors affecting the alignment. This paper describes and discusses some of the techniques by which a moving inertial platform may be aligned by using external velocity measurements and also presents some of the major problems and error sources affecting such alignment. It is based upon the results of a 3-year study, of inertial and doppler-inertial navigation at the Naval Ordnance Test Station, China Lake, California, and, in general, applies to inertial navigation systems which erect to either the local level or the mass-attraction vertical. Although rudimentary derivations are made of the alignment techniques, the paper is largely nonmathematical for ease of reading. Emphasis is placed upon the major errors affecting the alignment.

Laser-induced fluorescence of seeded nitric oxide as a flame thermometer

1998 ◽  
Vol 66 (4) ◽  
pp. 503-510 ◽  
Author(s):  
M. Tamura ◽  
J. Luque ◽  
J.E. Harrington ◽  
P.A. Berg ◽  
G.P. Smith ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Laser Induced Fluorescence

scholarly journals JWST Noise Floor. II. Systematic Error Sources in JWST NIRCam Time Series

2021 ◽  
Vol 161 (3) ◽  
pp. 115
Author(s):  
Everett Schlawin ◽  
Jarron Leisenring ◽  
Michael W. McElwain ◽  
Karl Misselt ◽  
Kenneth Don ◽  
...  
Keyword(s):  
Time Series ◽  
Systematic Error ◽  
Error Sources ◽  
Noise Floor
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