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  • 1995-1999  (5)
  • 1997  (5)
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  • 1995-1999  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of the fluorescence lifetime in Pr3+:ZBLAN glass for fiber optic thermometry (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3447-3451 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An analysis of the fluorescence decay behavior of Pr 3+ in ZBLAN glass, at different concentrations, has been undertaken, for applications of the material to fiber optic thermometry. The study has shown that with the temperature increase, the measured lifetimes of the fluorescence emission from the Pr 3+ doped glass are also seen to increase slowly. The results obtained are found not to support a simple two-level model based on the thermalization of the states involved but a new three-level model that has been introduced can explain the observed results in a very satisfactory way. The application of the work in optical thermometry is discussed and comparisons with other systems are made. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148307
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of the double exponential behavior in alexandrite for optical temperature sensing applications (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3442-3446 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An analysis of the fluorescence decay behavior of alexandrite emission, at higher dopant concentrations, has been undertaken for optical sensor application purposes. A double exponential decay behavior of the fluorescence emission has been observed, which differs from the single exponential behavior of alexandrite at lower concentrations of the active Cr 3+ ion. The origin of the phenomenon has been investigated both experimentally and theoretically and found to be produced by the joint contribution from the Cr3+ dopant in both the mirror, as well as in the inversion sites of that ion. The two lifetimes resulting, each having a different temperature dependence, both can be represented through the use of the configurational coordinate model which considers the effect of thermal quenching. The intensity ratio of these two aspects is seen to change regularly with the temperature within the important region for sensing of 273–773 K, and thus provides an alternative means to produce a calibrated fluorescence-based sensor. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148306
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of double exponential fluorescence decay behavior for optical temperature sensing (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 58-63 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Algorithms based on Prony's method are proposed for the estimation of exponential time constants of a double exponential fluorescence–decay process. The performance of these algorithms is evaluated, using Monte Carlo simulations, the results of which are presented showing that the performance of Prony's method can be greatly improved with the selection of an optimized observation window width and a few algorithm-related parameters. The applications of these noniterative algorithms in real-time, quasidistributed temperature sensor systems are discussed where the material decay may not approximate to a single exponential, or multimaterial sensors are used with a single, simple pump source and a single detector. Applications to quasidistributed sensor systems are considered and, thus, experimental results are presented to justify the use of the algorithms in Prony's method in practical double exponential fluorescence decay sensor analysis. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147755
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    Paper (German National Licenses)
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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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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence decay-time characteristics of erbium-doped optical fiber at elevated temperatures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2764-2766 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An investigation of lifetime characteristics of fluorescence, over the wavelength region ∼1.5 μm from pumped Er-doped fibers of various activator concentrations, at temperatures up to ∼950 °C, has been carried out and a significant variation of fluorescence lifetimes with temperature was seen. The results have an impact upon the use of laser or stimulated emission processes at much higher temperatures and for lifetime-based, fiber-optic temperature sensors, showing a very favorable characteristic for such latter applications. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148192
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    Paper (German National Licenses)
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