Abstract
Abstract
Infrared thermometry was applied to study the temperature distribution in microwave heating of diesel particulate filters. In situ non-contact temperature measurement tests were conducted using an integrated four-channel fibre-optic infrared temperature measurement and a microwave heating system. Silica light pipes, which are transparent to electromagnetic fields, were used to collect the infrared radiation from specified locations inside a filter during heating. The temporal and spatial temperature distributions in four microwave-heated diesel particulate filters with different soot and catalyst loading conditions were measured. Experimental results show the non-uniform heating inside filters. Catalyst coating, soot loading, and microwave power level all affect the heating rate and temperature distribution. Using 1 kW of microwave power, heating for 600 s can raise the temperature above 200°C in the soot-laden, catalysed filter.
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