Patent ID: 9646811
Date: 2017-05-09
CPC Classifications: G01N,H01J

Claim:
1. An ion mobility spectrometer (IMS) which incorporates an ion reservoir for providing enhanced sensitivity, with an improvement comprising; an electronic ion injection control circuit which enables high voltage switching in a manner effective to establish an ion reservoir, wherein said electronic ion injection control includes a resistive bridge circuit electrically coupled to a high voltage transistor; and means for providing a low voltage trigger timing pulse effective for tripping an opto-isolator, wherein said trigger timing pulse to said opto-isolator causes voltage to a base of the high voltage transistor to vary with said trigger timing pulse and wherein said high voltage transistor provides a sharp square wave voltage pulse to an ion control ring effective to produce a resultant drop in voltage which causes ions in the ion reservoir to be injected into a drift region of the IMS along an ion drift tube.