Establishing traceable radiation thermometry with in-line imaging system at the NIST AMMT facility (Conference Presentation)

Ivan Zhirnov; Vladimir Khromchenko; Brandon M. Lane; Steven E. Grantham; Sergey Mekhontsev

doi:10.1117/12.2305002

14 May 2018 Establishing traceable radiation thermometry with in-line imaging system at the NIST AMMT facility (Conference Presentation)

Ivan Zhirnov, Vladimir Khromchenko, Brandon M. Lane, Steven E. Grantham, Sergey Mekhontsev

Author Affiliations +

Proceedings Volume 10661, Thermosense: Thermal Infrared Applications XL; 106610C (2018) https://doi.org/10.1117/12.2305002
Event: SPIE Commercial + Scientific Sensing and Imaging, 2018, Orlando, FL, United States

Abstract

The paper describes efforts to establish traceable measurements of radiance temperature on laser-induced heated metal surfaces on the NIST Additive Manufacturing Metrology Testbed (AMMT). Knowledge of radiance temperature with a well understood uncertainty budget is a necessary initial step towards an ultimate project goal of traceable emittance and true surface temperature across the heat affected zone, which is a key objective in additive manufacturing research, and the subject of another paper at this conference. Reliable measurements of radiance temperature with an imaging system require (1) calibration of its responsivity at select radiance levels, (2) establishing a calibration equation that interpolates between these levels, (3) dealing with finite spectral bandpass and spatial non-uniformity of the sensor responsivity, and (4) ability for compensate effects of imperfect optical imaging and readout electronics on spatial distribution of the target. The developed system includes an integrating sphere-based calibration source, a pyrometer for its calibration against external blackbody, and an imaging system co-axially aligned with the heating laser, each of which using identical narrow band filters. This paper describes the evaluation of an 850 nm band, with additional wavebands planned for the future. This paper presents experimental results, description of measurement equation and processing algorithm, as well as a framework for establishing an uncertainty budget, including current estimates and future performance goals.

Conference Presentation

Citation Download Citation

Ivan Zhirnov, Vladimir Khromchenko, Brandon M. Lane, Steven E. Grantham, and Sergey Mekhontsev "Establishing traceable radiation thermometry with in-line imaging system at the NIST AMMT facility (Conference Presentation)", Proc. SPIE 10661, Thermosense: Thermal Infrared Applications XL, 106610C (14 May 2018); https://doi.org/10.1117/12.2305002

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KEYWORDS

Imaging systems

Radiation thermometry

Temperature metrology

Calibration

Additive manufacturing

Black bodies

Metrology

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