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UID:0-371@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20200127T123000

DTEND;TZID=Asia/Jerusalem:20200127T133000

DTSTAMP:20230527T140148Z

URL:https://aerospace.technion.ac.il/events/multispectral-infrared-thermog
 raphy-of-unknown-emissivity-targets/

SUMMARY:Multispectral Infrared Thermography of Unknown-Emissivity Targets
DESCRIPTION:Lecturer:Iliya Romm\n Faculty:Department of Aerospace Engineeri
 ng\n Institute:Technion – Israel Institute of Technology\n Location:Clas
 sroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \
 n Details: \n Many industrial and scientific applications require accurate
  measurement of radiation flux emitted by target surfaces. One of its most
  important applications is thermal infrared imaging for non-contact measur
 ement and monitoring of temperature.\nEmitted radiation flux is a function
  of the object’s temperature (via the Planck equation) and of its radiat
 ive properties (emissivity). When the emissivity of an observed object is 
 not sufficiently known\, the problem of temperature/emissivity separation 
 (TES) is encountered. TES is perhaps the biggest challenge in infrared the
 rmography\, manifesting as an inability to decouple the effect of emissivi
 ty on the radiant flux\, and in following\, reliably recover temperature. 
 Multispectral radiation thermometry (MRT) methods try to overcome this pro
 blem by assuming an emissivity model and combining measurements from sever
 al spectral bands to yield the target temperature and model parameters.\nT
 his research advances the state of the art in two avenues: by exploring be
 tter ways to operate MRT systems\, and by presenting an automated methodol
 ogy for their spectral design.\nIn terms of operation\, experimental pract
 ices for removing parasitic heat flux and random electronic noise are disc
 ussed. Image fusion is shown to serve a dual purpose: both overcoming dete
 ctor nonlinearities\, and increasing tonal fidelity. The commonly-used NUC
  (nonuniformity correction) procedure is challenged and improved upon. An 
 extended optical system calibration procedure is suggested\, which capture
 s not only the relation between temperature and detected signal\, but also
  between temperature and the drift of the characteristic wavelength. Lastl
 y\, a mathematical model is developed for utilizing the new calibration te
 chnique in temperature recovery.\nIn terms of spectral design\, this work 
 presents the first use of a multi-heuristic a-posteriori optimization tech
 nique for design space exploration of MRT systems. Automated designs can b
 e made applicable to either wider or narrower ranges of target emissivitie
 s\, via user-supplied information. Superiority of automated over manual de
 signs is demonstrated. Simulations indicate that a 4-channel thermographic
  system\, designed and operated according to the suggested guidelines\, ca
 n recover temperatures between 150-600°C within ±10°C for common aerona
 utical alloys (such as Inconel718\, HastelloyX and Ti-6Al-4V).\nThe indivi
 dual results of this work should all be seen as practical recommendations 
 that can be applied to most contemporary MRT systems to improve their perf
 ormance with no hardware changes (with the exception of simple optical fil
 ter adjustment).
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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