Resistance between inter digital electrodes depends on soot adsorption
Periodic heating regenerates sensor surface by burning soot layer off
Sensing Principle
positioning of sensor in exhaust pipe
protection tube extracts partial gas stream from main stream in pipe
protection tube guides partial gas stream over interdigital electrodes (IDE)
soot accumulation on and between interdigital electrodes (IDE)
growth of conductive soot paths through continuous accumulation leads to reduced electrical resistance
Sensing Principle
Soot particles adsorb on sensor surface
Adsorbed soot creates conducting pathways between interdigital electrodes Electrical voltage applied to interdigital electrode leads to current through the conducting pathways
