Page 318 - Instrumentation Reference Book 3E

302 Temperature measurement
as it passes the target spot. Figure 14.71 shows the Billing, B. F. and T. J. Quinn (eds), Temperature Mea-
installation arrangement schematically at (a), and surement 1975, Adam Hilger, Bristol. U.K. (1975)
at (b) shows the theoretical and actual signal from Eckert, E. R. G. and R. J. Goldstein (eds). Measure-
the radiation thermometer. The degradation nients it7 Heat Transfer, McGraw-Hill, New York
between the theoretical and actual signal is a func- (1976)
tion of the speed of response of the detector and the HMSO, The Calihafioii of Thernionieters (1971)
Kinzie, P. A,, Tliei-1110-couple Tenipevatiue Meastire-
frequency bandwidth of the electronics. The theor- ment, Wiley, Chichester, U.K. (1973)
etical signal consists of a sawtooth waveform. The Quinn, T. J., Teniperatu~e, Academic Press, New York
peak represents the moment when the next blade (1983)
enters the target area. The hottest part of the blade
is its leading edge, the temperature falling towards
the trailing edge. The signal falls until the next blade 14.9 Further reading
enters the field. The output from the thermometer
can be displayed, after signal conditioning, on an Aniicrnl Book of ASTM Standui-ds, Vol I4: Temperature
oscilloscope or can be analyzed by computer. Measirrernent, American Society for Testing and
Materials. Philadelphia. PA (1993)
Dougherty. E. P. (ed.). Temperature Control Principles
14.8 References .for Process Engineevs (1993)
McGhee, T. D.. Principles and Metliods of Teriiperature
ASTM, Marnial on Use of Thernto-couples in Tenzpera- Measurement, Wiley. Chichester. U.K. (1988)
ture hfeasurenzerzr, ASTM Special Technical Publica- Michalski, L.. K. Eckersdorf. and J. McGhee. Ten?-
tion 470B (1981) perature Measui-eriient, Wiley. Chichester, U.K. (1991)