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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

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

Revista

Título: Boundary-Layer Meteorology

Vol. 114 Nº 1

Páginas: 205-231

ISSN: 0006-8314

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 33 Citações

Scopus - 46 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 27