Singularities and undefinitions in the calibration functions of sonic anemometers

Cuerva Tejero, Alvaro and Sanz Andres, Angel Pedro and Lopez Garcia, Oscar (2004). Singularities and undefinitions in the calibration functions of sonic anemometers. "Journal of Atmospheric and Oceanic Technology", v. 21 (n. 12); pp. 1868-1875. ISSN 0739-0572. https://doi.org/10.1175/JTECH-1651.1.

Description

Title: Singularities and undefinitions in the calibration functions of sonic anemometers
Author/s:
  • Cuerva Tejero, Alvaro
  • Sanz Andres, Angel Pedro
  • Lopez Garcia, Oscar
Item Type: Article
Título de Revista/Publicación: Journal of Atmospheric and Oceanic Technology
Date: 2004
ISSN: 0739-0572
Volume: 21
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Vehículos Aeroespaciales [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A mathematical model of the process employed by a sonic anemometer to build up the measured wind vector in a steady flow is presented to illustrate the way the geometry of these sensors as well as the characteristics of aerodynamic disturbance on the acoustic path can lead to singularities in the transformation function that relates the measured (disturbed) wind vector with the real (corrected) wind vector, impeding the application of correction/calibration functions for some wind conditions. An implicit function theorem allows for the identification of those combinations of real wind conditions and design parameters that lead to undefined correction/ calibration functions. In general, orthogonal path sensors do not show problematic combination of parameters. However, some geometric sonic sensor designs, available in the market, with paths forming smaller angles could lead to undefined correction functions for some levels of aerodynamic disturbances and for certain wind directions. The parameters studied have a strong influence on the existence and number of singularities in the correction/ calibration function as well as on the number of singularities for some combination of parameters. Some conclusions concerning good design practices are included.

More information

Item ID: 39748
DC Identifier: http://oa.upm.es/39748/
OAI Identifier: oai:oa.upm.es:39748
DOI: 10.1175/JTECH-1651.1
Official URL: http://journals.ametsoc.org/doi/pdf/10.1175/JTECH-1651.1
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 29 Mar 2016 08:58
Last Modified: 29 Mar 2016 08:58
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