Thin-filament pyrometry with a digital still camera

Jignesh D. Maun, Peter B. Sunderland, and David L. Urban

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Abstract

A novel thin-filament pyrometer is presented. It involves a consumer-grade color digital still camera with 6 megapixels and 12 bits per color plane. SiC fibers were used and scanning-electron microscopy found them to be uniform with diameters of$13.9\text{\hspace{0.17em}μm}$. Measurements were performed in a methane–air coflowing laminar jet diffusion flame with a luminosity length of$\text{72mm}$. Calibration of the pyrometer was accomplished with B-type thermocouples. The pyrometry measurements yielded gas temperatures in the range of 1400–2200 K with an estimated uncertainty of$\pm \text{60K}$, a relative temperature resolution of$\pm \text{0.215K}$, a spatial resolution of$\text{42μm}$, and a temporal resolution of$\text{0.66ms}$. Fiber aging for 10 min had no effect on the results. Soot deposition was less problematic for the pyrometer than for the thermocouple.

© 2007 Optical Society of America

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