Difference equation approach to two-thermocouple sensor characterization in constant velocity flow environments

P. C. Hung, G. Irwin, R. Kee, S. McLoone

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Thermocouples are one of the most popular devices for temperature measurement due to their robustness, ease of manufacture and installation, and low cost. However, when used in certain harsh environments, for example, in combustion systems and engine exhausts, large wire diameters are required, and consequently the measurement bandwidth is reduced. This article discusses a software compensation technique to address the loss of high frequency fluctuations based on measurements from two thermocouples. In particular, a difference equation (DE) approach is proposed and compared with existing methods both in simulation and on experimental test rig data with constant flow velocity. It is found that the DE algorithm, combined with the use of generalized total least squares for parameter identification, provides better performance in terms of time constant estimation without any a priori assumption on the time constant ratios of the thermocouples.
Original languageEnglish
Pages (from-to)4902
JournalReview of Scientific Instruments, Volume 76, Issue 2, pp. 024902-024902-10 (2005).
Volume76
Publication statusPublished - 01 Feb 2005

Keywords

  • Thermometers
  • Sensors
  • remote sensing
  • Measurement and error theory
  • Computer modeling and simulation

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