국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Thermographic Imaging of the Space Shuttle During Re-Entry Using a Near Infrared Sensor
저자	Zalameda, Joseph N.;; Horvath, Thomas J.;; Kerns, Robbie V.;; Burke, Eric R.;; Taylor, Jeff C.;; Spisz, Tom;; Gibson, David M.;; Shea, Edward J.;; Mercer, C. David;; Schwartz, Richard J.;; Tack, Steve;; Bush, Brett C.;; Dantowitz, Ronald F.;; Kozubal, Marek J.
Keyword	DECOMPOSITION;; EIGENVALUES;; HISTOGRAMS;; HYPERSONICS;; IMAGE PROCESSING;; INFRARED IMAGERY;; PREDICTION ANALYSIS TECHNIQUES;; RADIANT FLUX DENSITY;; SPACE SHUTTLES;; THERMAL MAPPING;; THERMOGRAPHY;; TURBULENCE MODELS
URL	http://hdl.handle.net/2060/20120007664
보고서번호	NF1676L-13532
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	High resolution calibrated near infrared (NIR) imagery of the Space Shuttle Orbiter was obtained during hypervelocity atmospheric re-entry of the STS-119, STS-125, STS-128, STS-131, STS-132, STS-133, and STS-134 missions. This data has provided information on the distribution of surface temperature and the state of the airflow over the windward surface of the Orbiter during descent. The thermal imagery complemented data collected with onboard surface thermocouple instrumentation. The spatially resolved global thermal measurements made during the Orbiter s hypersonic re-entry will provide critical flight data for reducing the uncertainty associated with present day ground-to-flight extrapolation techniques and current state-of-the-art empirical boundary-layer transition or turbulent heating prediction methods. Laminar and turbulent flight data is critical for the validation of physics-based, semi-empirical boundary-layer transition prediction methods as well as stimulating the validation of laminar numerical chemistry models and the development of turbulence models supporting NASA s next-generation spacecraft. In this paper we provide details of the NIR imaging system used on both air and land-based imaging assets. The paper will discuss calibrations performed on the NIR imaging systems that permitted conversion of captured radiant intensity (counts) to temperature values. Image processing techniques are presented to analyze the NIR data for vignetting distortion, best resolution, and image sharpness. Keywords: HYTHIRM, Space Shuttle thermography, hypersonic imaging, near infrared imaging, histogram analysis, singular value decomposition, eigenvalue image sharpness.