Calibration Accuracy for Constant Temperature Thermal Anemometer

Anita M. Thompson, Bruce N. Wilson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Thermal anemometry is widely used to measure fluid velocity and boundary shear stress. Sensor calibration is required and results in a nonlinear equation with anemometer voltage as a function of fluid velocity or shear stress. Uncertainties in the parameters of the nonlinear equation are a source of uncertainty in measured values. A method for quantifying the calibration accuracy is presented using regression analysis with 95% confidence and prediction intervals. The proposed method is applied to shear stress measurements of a calibrated flush-mounted hot-film sensor. Shear stresses ranged from 0.6 to 6.8 Pa. Calibration accuracy was found to be within 15% of the absolute shear.

Original languageEnglish (US)
Pages (from-to)833-836
Number of pages4
JournalJournal of Hydraulic Engineering
Issue number8
StatePublished - 2004

Bibliographical note

Publisher Copyright:
Copyright © 2004 American Society of Civil Engineers.


  • Anemometers
  • Calibration
  • Confidence intervals
  • Regression analysis
  • Shear stress
  • Temperature
  • Thermal factors


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