Digital temperature compensation of a thermistor flowmeter


Journal Article

The temperature compensation of a thermistor flowmeter is accomplished digitally, thus simplifying the compensation problem by replacing required hardware with software. The resistance-temperature curve of the thermistor is a least-squares fit to a logarithmic function whose coefficients are stored in computer memory. Signals representing the temperature of the heated thermistor and the ambient temperature are digitised and converted to temperature values based on the stored resistance-temperature curve. In this case the signals are obtained from a single thermistor switched between the high and low overheat modes. The thermistor temperature T, the ambient temperature Ta, and the electrical power input are used to form the dissipation factor (K=P/(T-Ta)) which calibrates the flowmeter when plotted against velocity. Results from calibration experiments on a thermistor flowmeter designed for use in human coronary arteries are presented to demonstrate the viability of the method.

Full Text

Duke Authors

Cited Authors

  • Katz, IM; Shaughnessy, EJ

Published Date

  • December 1, 1987

Published In

Volume / Issue

  • 20 / 5

Start / End Page

  • 561 - 564

International Standard Serial Number (ISSN)

  • 0022-3735

Digital Object Identifier (DOI)

  • 10.1088/0022-3735/20/5/021

Citation Source

  • Scopus