Semiconductor gas sensing coupled with presampling system for toxic compounds and chemical threat agents detection

An innovative approach of sensitive and selective detection of trace amounts of chemical threat agents is presented in this work. The technology deals with semiconductor metal oxide gas sensors as a means of express gas detection, coupled with pre-sampling system, which is to improve sensitivity and selectivity of analysis. Examples for H₂S, DMMP (phosphor-organic weapons simulant) and UDMH (highly toxic rocket engine fuel constituent) sensor detection with aided by presampling system are given. The issues of sensor and adsorbent materials selection and their working parameters are discussed.