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Record 1 of 1380
Two Fiber Optical Fiber Thermometry
Author and Affiliation:
Jones, Mathew R.(Arizona Univ., Dept. of Aerospace and Mechanical Engineering, United States)
Farmer, Jeffery T.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Breeding, Shawn P.(Tec-Masters, Inc., United States)
Abstract: An optical fiber thermometer consists of an optical fiber whose sensing tip is given a metallic coating. The sensing tip of the fiber is essentially an isothermal cavity, so the emission from this cavity will be approximately equal to the emission from a blackbody. Temperature readings are obtained by measuring the spectral radiative heat flux at the end of the fiber at two wavelengths. The ratio of these measurements and Planck's Law are used to infer the temperature at the sensing tip. Optical fiber thermometers have high accuracy, excellent long-term stability and are immune to electromagnetic interference. In addition, they can be operated for extended periods without requiring re-calibration. For these reasons. it is desirable to use optical fiber thermometers in environments such as the International Space Station. However, it has recently been shown that temperature readings are corrupted by emission from the fiber when extended portions of the probe are exposed to elevated temperatures. This paper will describe several ways in which the reading from a second fiber can be used to correct the corrupted temperature measurements. The accuracy and sensitivity to measurement uncertainty will be presented for each method.
Publication Date: Jan 25, 2000
Document ID:
20000033985
(Acquired May 05, 2000)
Subject Category: INSTRUMENTATION AND PHOTOGRAPHY
Document Type: Preprint
Meeting Information: Mechanical Engineering; 05 Nov. 2000; Orlando, FL; United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: OPTICAL FIBERS; TEMPERATURE MEASUREMENT; THERMOMETERS; HEAT FLUX; WAVELENGTHS; ACCURACY; PLANCKS CONSTANT
Availability Source: Other Sources
Availability Notes: Abstract Only
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