Differential mobility detector
A differential mobility detector (DMD) is a type of microelectromechanical system, radio frequency modulated ion mobility spectrometry (MEMS RF-IMS) device. Though its small in size, it easily fits into portable units, such as transferable gas chromatographs or drug/explosives sensors. For instance, it was incorporated by Varian in its CP-4900 DMD MicroGC, and by Thermo Fisher in its EGIS Defender system, designed to detect narcotics and explosives in transportation or other homeland security applications.
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