A swept-field multi-channel aspiration condenser for low-ppm level detection

IMS(Ion Mobility Spectrometry) is a technique has been widely used for hazardous compounds detection. IMS can operates in atmospheric condition with low detection limit and fast response time. It became popular in various application, such as detection of chemical warfare agent, toxic industrial compounds and explosives. In this paper, we present a low-cost, easy to assembly device as an ion mobility spectrometry. This device is based on the theory of the first order differential aspiration condenser described by Puumalainen. Unlike the original device proposed by Puumalainen, the electric field is swept in discrete steps and can be control by user for specific application. Tammet transform is introduced to our system for expanding gas recognition ability. The result shows our system is capable for low-ppm level gas detection.