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We present a novel thermal conductivity detector design in which output is minimally affected by changing flow rates in a microchannel. In gas chromatography systems, pressure fluctuations can result in false peaks and an unstable baseline, reducing the systems limit of detection. Furthermore, ramping the temperature of a separation column, used in many chemical separations, changes the viscosity...
Micro-Thermal Conductivity Detectors (µTCDs) have been designed, fabricated and tested in a gas chromatography system to show a correlation between detector design and the mean free path of the carrier gas. Our tests show that for a fixed detector design, the maximum possible response is limited by the Knudsen number (the ratio of the mean free path of the gas and chamber critical dimensions). Therefore,...
We have developed a novel, calibration free, micro electromechanical device and method for the measurement of linear flow rate in a micro-gas chromatography (GC) system This design enables the integration of a flow rate measurement with a high sensitivity thermal conductivity detector (TCD) reported at MEMS 2009. Accurate knowledge of the flow rate is of vital importance when quantifying the results...
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