Multiband fiber optic radiometry for measuring the temperature and emissivity of gray bodies of low or high emissivity

Sharon Sade, Abraham Katzir

Research output: Contribution to journalArticlepeer-review

Abstract

Infrared fiber optic radiometry was used for noncontact thermometry of gray bodies whose temperature was close to room temperature (40-70°C). We selected three gray bodies, one with high emissivity (ε = 0.97), one with medium emissivity (ε = 0.71), and one with low emissivity (ε = 0.025). We carried out optimization calculations and measurements for a multiband fiber optic radiometer that consisted of a silver halide (AgClBr) infrared-transmitting fiber, a dual-band cooled infrared detector, and a set of 18 narrowband infrared filters that covered the 2-14-μm spectral range. We determined the optimal spectral range, the optimal number of filters to be used, and the optimal chopping scheme. Using these optimal conditions, we performed measurements of the three gray bodies and obtained an accuracy of better than 1°C for body temperature and for room temperature. An accuracy of 0.03 was obtained for body emissivity.

Original languageEnglish
Pages (from-to)1799-1810
Number of pages12
JournalApplied Optics
Volume43
Issue number9
DOIs
StatePublished - 20 Mar 2004

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