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Um anemômetro de filme quente alternativo à corrente constante.

2007; UNIVERSIDADE DE FORTALEZA; Volume: 28; Issue: 2 Linguagem: Inglês

2318-0730

Lutero Carmo de Lima, Marcus Antônio Viana Duarte, João Bosco Leal Verçosa, Vinícius Milanez Couto,

Flow Measurement and Analysis

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.