Measurement of air temperature in the presence of a large radiant flux: An assessment of passively ventilated thermometer screens

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Vítor Leal (Author) FEUP; Eduardo Maldonado (Author) FEUP

Journal

Title: Boundary-Layer Meteorology

Vol. 114 No. 1

Pages: 205-231

ISSN: 0006-8314

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 33 Citations

Scopus - 46 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-000-59N

DOI: 10.1007/s10546-004-8946-8

Abstract (EN): The energy balance of small temperature sensors was modelled to illustrate the effects of sensor characteristics, particularly size, on the accuracy of readings in the presence of strong shortwave or longwave radiant loads. For all but extremely small sensors, radiant exchange may lead to unacceptable errors. The common practice of using passively ventilated instrument screens was evaluated in a series of comparative measurements. The differences resulting from the use of different models of shields may be an order of magnitude greater than the error resulting from sensor calibration. In the absence of technological innovation capable of reducing the error due to radiant exchange to negligible proportions, it is suggested that a standard methodology for calibrating and labelling the error resulting from the characteristics of the screens be adopted, to allow comparison of new data with long-established records.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 27