Two-color infrared thermometer for low-temperature measurement using a hollow glass optical fiber

Ward Small IV, Peter M. Celliers, Luiz B. Da Silva, Dennis L Matthews, Barbara A. Soltz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Number of pages6
StatePublished - 1997
Externally publishedYes
EventSpecialty Fiber Optics for Biomedical and Industrial Applications - San Jose, CA, United States
Duration: Feb 10 1997Feb 10 1997


OtherSpecialty Fiber Optics for Biomedical and Industrial Applications
Country/TerritoryUnited States
CitySan Jose, CA


  • Blackbody
  • Emissivity
  • Hollow glass waveguide
  • Infrared
  • Lock-in amplification
  • Radiation thermometry

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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