Two-color mid-infrared thermometer with a hollow glass optical fiber
- Lawrence Livermore National Laboratory, L-399, P.O. Box 808, Livermore, California 94550 (United States)
- Conversion Energy Enterprises, 81 Pinebrook Road, Spring Valley, New York 10977 (United States)
We have developed a low-temperature optical-fiber-based two-color infrared thermometer. A single 700-{mu}m-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. {copyright} 1998 Optical Society of America
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 675102
- Journal Information:
- Applied Optics, Vol. 37, Issue 28; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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