Single-crystal sapphire tubes as economical probes for optical pyrometry in harsh environments

Journal Article · Tue Dec 20 00:00:00 EST 2011 · Applied Optics

DOI:https://doi.org/10.1364/AO.50.006599· OSTI ID:22036787

Ruzicka, Jakub; Houzvicka, Jindrich; Bok, Jiri; Praus, Petr; Mojzes, Peter

One-end-sealed single-crystal sapphire tubes are presented as a simple, robust, and economical alternative for bulky lightpipe probes. Thermal radiation from a blackbody cavity created at the inner surface of the sealed end is gathered by a simple lens-based collecting system and transmitted via optical fiber to the remote detection unit. Simplicity and applicability of the concept are demonstrated by the combination of commercially available sapphire tubes with a common optical pyrometer. Radiation thermometers with sapphire tubes as invasive probes can be useful for applications requiring immunity to electromagnetic interference, resistance to harsh environments, simple replacement in the case of failure, and enhanced mechanical firmness, enabling wider range probe positioning inside the medium of interest.

• OSTI ID: 22036787
• Journal Information: Applied Optics, Vol. 50, Issue 36; Other Information: (c) 2011 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CAVITIES
DETECTION
IMMUNITY
INTERFERENCE
LENSES
MONOCRYSTALS
OPTICAL FIBERS
OPTICAL PYROMETERS
PROBES
SAPPHIRE
SURFACES
THERMAL RADIATION
THERMOMETERS
TUBES