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Proceedings Paper

Two-color infrared thermometer for low-temperature measurement using a hollow glass optical fiber
Author(s): Ward Small; Peter M. Celliers; Luiz Barroca Da Silva; Dennis L. Matthews; Barbara A. Soltz
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Paper Abstract

A low-temperature fiber optic two-color infrared thermometer has been developed. Radiation from a target is collected via a single 700 micrometer-bore hollow glass optical fiber coated with a metallic/dielectric layer on the inner surface, simultaneously split into two paths and modulated by a gold-coated reflective chopper, and focused onto two thermoelectrically cooled mid-infrared HgCdZnTe photoconductors by 128.8 mm-radius gold-coated spherical mirrors. The photoconductors have spectral bandpasses of 2 - 6 micrometer and 2 - 12 micrometer, respectively. The modulated detector signals are recovered using lock-in amplification. The two signals are calibrated using a blackbody (emissivity equal to 1) of known temperature, and exponential fits are applied to the two resulting voltage versus temperature curves. Using the two calibration equations, a computer algorithm calculates the temperature and emissivity of a target in real time, taking into account reflection of the background radiation field from the target surface.

Paper Details

Date Published: 18 April 1997
PDF: 6 pages
Proc. SPIE 2977, Specialty Fiber Optics for Biomedical and Industrial Applications, (18 April 1997); doi: 10.1117/12.271014
Show Author Affiliations
Ward Small, Lawrence Livermore National Lab. (United States)
Peter M. Celliers, Lawrence Livermore National Lab. (United States)
Luiz Barroca Da Silva, Lawrence Livermore National Lab. (United States)
Dennis L. Matthews, Lawrence Livermore National Lab. (United States)
Barbara A. Soltz, Conversion Energy Enterprises (United States)

Published in SPIE Proceedings Vol. 2977:
Specialty Fiber Optics for Biomedical and Industrial Applications
Abraham Katzir; James A. Harrington, Editor(s)

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