A hot-film anemometer circuit operated at constant current.

Authors

  • Lutero Carmo de Lima Universidade Estadual do Ceará
  • Marcus Antonio Viana Duarte
  • João Bosco Leal Verçosa Junior Universidade Estadual do Ceará
  • Vinicius Milanez Couto

Keywords:

Anemômetro. Filme quente. Velocidade de escoamento.

Abstract

In this study it is presented a hot-film anemometer circuit, operated at constant current, constituted of a Wheatstone bridge and a high-gain differential amplifier. The sensor element, different from the usual hot film, is a temperature gauge of thermo-resistive conception, in which a nickel film is deposited above a substrate forming a 3,2 x 3,2 mm grid and 5 ?m thick. The probe, being cheap and easy to construct, has a sensitivity of the regular anemometers. Several measurements of velocity were made of an air flow, in the range of 2 – 12 m/s. The calibration curve showed the maximum deviation of 10% from the experimental data. It was also investigated the dynamic response of the instrument, the fluid flow velocity.

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How to Cite

de Lima, L. C., Duarte, M. A. V., Verçosa Junior, J. B. L., & Couto, V. M. (2009). A hot-film anemometer circuit operated at constant current. Revista Tecnologia, 28(2). Retrieved from https://ojs.unifor.br/tec/article/view/54

Issue

Vol. 28 No. 2 (2007)

Section

Artigos

License

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