Patent ID: 6995361

Claim:
A radial disk type ion mobility spectrometer, comprising: an ionizing chamber being a cylindrical hollow box, which is formed of an inlet for supplying sample gas therethrough, and a slit made by cutting away a part of a cylindrical wall corresponding to a predetermined width for discharging ionized ions therethrough, and including an ionizing means for ionizing the supplied sample gas to generate ions having a predetermined polarity; a shutter grid installed adjacent to the slit of the ionizing chamber for controlling passage of the ions through the slit; a drift chamber being a cylindrical hollow box including an outer cylindrical wall having a predetermined diameter and an inner cylindrical wall having an inner diameter equal to an outer diameter of the ionizing chamber so that an annular space is formed between the inner and outer cylindrical walls having a predetermined thickness, of which a part of the inner cylindrical wall corresponding to a width larger than that of the slit is cut away so that the ions passing through the slit can be introduced into the annular space through the cutaway part of the inner cylindrical wall, and of which the inner cylindrical wall is engaged with the cylindrical wall of the ionizing chamber in such a manner that the drift chamber communicates with the ionizing chamber through the slit and the cutaway part of the inner cylindrical wall; and a collector installed onto an inner surface of the outer cylindrical wall of the drift chamber for collecting the ions that have passed through the drift chamber, wherein the slit of the ionizing chamber and the collector being placed on the same line of the radial direction of the drift chamber.