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A differential mobility detector (DMD) is a type of microelectromechanical system, radio frequency modulated ion mobility spectrometry (MEMS RF-IMS) device.
Portable devices
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 security applications.
References
Differential mobility detector Wikipedia(Text) CC BY-SA