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  • 1
    Electronic Resource
    Electronic Resource
    Thulium-doped fiber optic decay-time temperature sensors: Characterization of high temperature performance (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1614-1620 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The main objectives of this study were to investigate the thermometric potential of Tm-doped optical fiber and yttrium aluminum garnet (YAG) crystals for applications up to temperatures as high as 1300 °C, and to realize a prototype high temperature fluorescence fiber probe based on earlier Nd-doped fiber work for temperature measurement up to 750 °C. The research showed that the fluorescence characteristics of the Tm-doped YAG crystal were very stable at high temperatures and capable of providing a temperature measurement reproducibility better than ±6 °C over the region from room temperature up to 1350 °C. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150506
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of erbium-doped intrinsic optical fiber sensor probes at high temperatures (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2924-2929 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The use of rare-earth-doped fibers for high temperature measurement has shown considerable promise. In this work, studies of the key characteristics of the performance of Er-doped fiber-based thermometer probes using the fluorescence decay time technique were carried out. Results showed the effects of fluorescence intensity as a function of doped fiber length and temporal and dopant concentration features of the probes. Annealing effects were seen to occur, and a satisfactory stable performance at up to 1100 °C was reported from this material, yielding improvement on results obtained with Nd-based systems. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149035
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of local high temperature excursion in an intrinsic doped fiber fluorescence-based sensor (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2930-2934 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A fluorescence-based intrinsic doped fiber temperature sensing system for determining local extremes of high temperatures has been demonstrated in this work. Data on this temperature rise are analyzed using a mathematical relationship, based on a correlation coefficient ratio scheme, to relate to the reduced fluorescence decay time information thus associated with the hot part of the fiber. In schemes incorporating this mathematical analysis, two separate sensor configurations have been demonstrated, one of which is to use short, single lengths of fiber spliced into a network and the other a long single length of doped fiber, using both Nd and Er doped fiber materials. The results show that the correlation coefficient ratio, R, will deviate from and be smaller than unity with the increase of the temperature of the localized region where the heat is applied, providing the mechanism for a simple high temperature excursion detection system. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149036
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  • 4
    Electronic Resource
    Electronic Resource
    Potential for temperature sensor applications of highly neodymium-doped crystals and fiber at up to approximately 1000 °C (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2759-2763 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This work reports on the thermographic characteristics and their potential for use, in fiber optic temperature sensors, of a range of neodymium-doped materials. Their comparative value for low-cost, simple sensors is discussed, using both crystalline materials in the bulk form and a specimen of highly doped, multimode neodymium fiber. The effects of annealing of the bulk materials are discussed in light of their suitability for such sensor applications. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148191
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral characteristics and effects of heat treatment on intrinsic Nd-doped fiber thermometer probes (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 139-145 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A detailed investigation of the practical spectroscopic features and the effect of prolonged exposure to elevated temperatures of an intrinsic Nd:doped fiber optic thermometer probe using the fluorescence decay time technique has been carried out. Results have shown the optimum length for the doped fiber and a maximum operating temperature of 750 °C, beyond which a range of high-temperature "annealing" effects are seen. These are discussed in light of the operation of the thermometers over the range from −196 to 750 °C and potentially above. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148489
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  • 6
    Electronic Resource
    Electronic Resource
    Fluorescent-based lifetime measurement thermometer for use at subroom temperatures (200–300 K) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2611-2614 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development, construction, and evaluation of a simple ruby-based fiber optic thermometer, for use over the region 200–300 K, are described. The results are compared with those obtained from a simple theoretical model, which may be used for system calibration, and with those of previously published work, and good agreement is seen. The application of such a sensor to the food processing industry and environmental monitoring is indicated. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145596
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  • 7
    Electronic Resource
    Electronic Resource
    Ytterbium-based fluorescence decay time fiber optic temperature sensor systems (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 4179-4185 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A series of different Yb-doped fibers has been investigated to determine their potential for use as the active elements in fluorescence–lifetime based thermometry, over a wide range from room temperature to 700 °C. Heat treatment ("annealing") has been shown to be necessary in practical applications to achieve consistent and reproducible calibration curves, each of which is consistent with the results of a simple two level model. Each sample studied was found to possess unique sensitivity characteristics, enabling an optimized selection for specific applications. The response of the thermometer and the error in the measurement was found to be, at 〈±5 °C, consistent with the stability of the calibrated oven used. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149267
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  • 8
    Electronic Resource
    Electronic Resource
    Design aspects of a ruby-based fiber optic thermometer probe for use in the cryogenic region ((approximately-greater-than)77 K) (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2394-2396 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Research has been carried out showing that severe errors in the calibration of ruby fluorescence decay-time fiber optic thermometers, particularly in the cryogenic region ((approximately-greater-than) 77 K), can occur if probes are not carefully designed to avoid fluorescence reabsorption effects. This effect is investigated and quantified. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147050
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  • 9
    Electronic Resource
    Electronic Resource
    Erbium/ytterbium fluorescence based fiber optic temperature sensor system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4017-4022 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Erbium/ytterbium co-doped fibers have been investigated in this work for the first time to determine their potential in thermometry applications based on the use of fluorescence decay. Several samples have been used and their performance characteristics determined. These have included studies of fiber annealing as well as thermal cycling tests and it was found that unlike other rare-earth ion doped fibers previously studied, such as Nd3+, Er3+, or Tm3+ doped fibers, the Er/Yb co-doped samples used here have shown a much smaller degree of thermal annealing when their thermal characteristics have been evaluated and compared. The response of the thermometer and the error in the measurement was found to be, at 〈±5 °C, within the stability of the oven used in the tests over a wide temperature range from 0 to 850 °C. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289682
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  • 10
    Electronic Resource
    Electronic Resource
    Intrinsic strain and temperature characteristics of Yb-doped silica-based optical fibers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1447-1451 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An investigation of strain and temperature characteristics of Yb-doped fibers has been carried out in this article. Results obtained are compared with those reported on Nd-doped fibers, showing that the lifetime variation rate of the single mode Yb-doped fiber with increasing strain is temperature independent, and within experimental error similar to that of Nd, although in each case, the fiber modes, the dopant concentration level, and the rare earth ion itself are different. Their stable behavior may form the basis of a dual element sensor with which to obtain stress and temperature information independently in so-called "smart structures." © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149603
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