Turbine-engine applications of thermographic-phosphor temperature measurements
- Noel Associates, Espanola, NM (United States)
- EG&G Energy Measurements, Goleta, CA (United States)
- Martin Marietta Energy Systems, Oak Ridge, TN (United States)
The thermographic-phosphor (TP) method can measure temperature, heat flux, strain, and other physical quantities remotely in hostile and/or inaccessible environments such as the first-stage turbine components in turbine engines. It is especially useful in situations in which no other known method works well. This paper is a brief review of engine tests that demonstrated the utility of the TP method. For the most part, the results presented here are discussed only qualitatively. The papers in the bibliography describe these and other experiments and results in detail. The first viewgraph summarizes the many desirable features of the TP method. The second viewgraph describes TPs, and the third summarizes how the TP method works. To measure single-point temperatures in turbine-engine applications, we use the decay-time method, which depends on the fact that the luminescence following an impulse of ultraviolet excitation decays, with a characteristic decay time that. Is a monotonically decreasing function of temperature over some range of temperatures. The viewgraph is a set of calibration curves showing the behavior of some useful emission lines for ten important TPs. Consider Lu PO{sub 4}:Eu as an example. Below the {open_quotes}quenching{close_quotes} temperature near 900 Y, the decay time is nearly constant. Above it, the decay time decreases exponentially with the temperature. This strong functional dependence means that one can have a fairly large error in the lifetime measurement, as in environments with poor signal-to-noise ratios (SNRs), yet still obtain high accuracy in the temperature measurement. Our more-recent data up to 1900 K show the same behavior.
- Research Organization:
- EG and G Energy Measurements, Inc., Goleta, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC08-93NV11265
- OSTI ID:
- 10103340
- Report Number(s):
- EGG-11265-3011; CONF-9410259-1; ON: DE95003625; TRN: 95:000462
- Resource Relation:
- Conference: Remote temperature sensing workshop,Cleveland, OH (United States),27-28 Oct 1994; Other Information: DN: Includes vugraphs; PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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