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Longitudinal hot-wire sensor in a fluid channel. As the liquid fills along the channel, the resistance of the hotwire decreases linearly. The resistance value is proportional to the value of , the length of the liquid filling.
(Left) Bridge circuit used to measure the resistance change in the sensor and hence its temperature. (Right) Infrared microscope image of the resistive sensor with bridge voltage of .
Voltages output drops linearly as the liquid fills the entire section of the channel. The slope in the graph between and indicates the liquid is moving at a constant speed.
Various flow speed values were measured with the sensor and compared with optical measurement.
Voltage output trace associated with an intermittent filling process, reaching positions a, b, and c successively.
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