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.
Original language | English (US) |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Pages | 115-120 |
Number of pages | 6 |
Volume | 2977 |
DOIs | |
State | Published - 1997 |
Externally published | Yes |
Event | Specialty Fiber Optics for Biomedical and Industrial Applications - San Jose, CA, United States Duration: Feb 10 1997 → Feb 10 1997 |
Other
Other | Specialty Fiber Optics for Biomedical and Industrial Applications |
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Country | United States |
City | San Jose, CA |
Period | 2/10/97 → 2/10/97 |
Keywords
- 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