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CTA measurements at low overheats
Antoš, Pavel
The static dependence of the output anemometer voltage on the gain and the offset voltage of the amplifier was investigated experimentally. The DISA CTA bridge 55M10 was examined. Data were compared to the measurements performed at a Wheatston bridge without any amplifier.
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Interpretace měření CTA anemometrem při nízkém žhavení
Antoš, Pavel
The paper deals with an effect of dynamic adjustment on the behaviour of constant-temperature anemometer. The static dependence of the output anemometer voltage on the gain and the offset voltage of the amplifier was investigated experimentally. Applied model of the CTA feedback system fits the behaviour of the bridge satisfactory.
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Reference Film Temperature in the Hot-wire Anemometry
Antoš, Pavel
Dimensionless parameters in the cooling law are referred to the reference film temperature. In case of the mean film temperature there is necessary to use a temperature loading factor. There were found such reference temperatures that the loading factor is eliminated.
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Assessment of the sensor temperature in HWA
Antoš, Pavel
One of the key parameters in hot-wire anemometry is the temperature of the sensor. The temperature is set on CTA via the resistivity of the hot sensor. Several probes were tested using a variable temperature oil bath. Dependence of the resistivity on the temperature and means of its estimation are the subjects of the paper.
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