Two-color mid-infrared thermometer with a hollow glass optical fiber

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

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We have developed a low-temperature optical-fiber-based two-color infrared thermometer. A single 700-μm-bore hollow glass optical fiber collects and transmits radiation that is then modulated and split into two paths by a reflective optical chopper. Two different thermoelectrically cooled mid-infrared HgCdZnTe photoconductors monitor the chopped signals that are recovered with lock-in amplification. With the two previously obtained blackbody calibration equations, a computer algorithm calculates the true temperature and emissivity of a target in real time, taking into account reflection of the ambient radiation field from the target surface. The small numerical aperture of the hollow glass fiber and the fast response of the detectors, together with the two-color principle, permit high spatial and temporal resolution while allowing the user to dynamically alter the fiber-to-target distance.

Original languageEnglish (US)
Pages (from-to)6677-6683
Number of pages7
JournalApplied Optics
Issue number28
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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