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Two-terminal longitudinal hotwire sensor for monitoring the position and speed of advancing liquid fronts in microfluidic channels
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10.1063/1.2180447
/content/aip/journal/apl/88/10/10.1063/1.2180447
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/10/10.1063/1.2180447
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

(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 .

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Various flow speed values were measured with the sensor and compared with optical measurement.

Image of FIG. 5.
FIG. 5.

Voltage output trace associated with an intermittent filling process, reaching positions a, b, and c successively.

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/content/aip/journal/apl/88/10/10.1063/1.2180447
2006-03-09
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Two-terminal longitudinal hotwire sensor for monitoring the position and speed of advancing liquid fronts in microfluidic channels
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/10/10.1063/1.2180447
10.1063/1.2180447
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