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Estimation of hygrometry uncertainties by propagation of distributions

Vincent Carpentier1,2, Mohamed Megharfi1, Jacques Quint2, Marc Priel1, Michèle Desenfant1 and Ronan Morice1

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Using techniques for the propagation of distributions to estimate uncertainties is becoming increasingly popular in metrology. Here we describe the calculation for the estimation of uncertainties in hygrometry using this method. This work is based on investigations on the two-temperature moist gas generator at Laboratoire National d'Essais.

After a brief introduction on the calibration principles of hygrometers, models and calculation for estimating uncertainties using a Monte Carlo simulation are presented. Results concerning dew point temperature and relative humidity are shown, and compared with results obtained with the law of propagation of uncertainties (traditional method).

The importance of the moist gas temperature measurement with regard to the saturator and the test chamber is confirmed. Moreover, results observed with the propagation of distributions and the traditional method are coherent.


PACS

07.07.Vx Hygrometers

07.20.Dt Thermometers

06.20.Dk Measurement and error theory

02.50.Ng Distribution theory and Monte Carlo studies

06.20.F- Units and standards

Subjects

Computational physics

Instrumentation and measurement

Dates

Issue 6 (December 2004)

Received 30 June 2004

Published 16 November 2004



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