A fiber optic sensor (Optsensor, ThermAigle-RD HQ-28) wasinserted in one of the samples for temperature measurement. Themeasured data of temperature, weight, humidity and flow ratewere transferred to the PC for controlling and recording purposes. Weight reading, humidity reading, power control, temperaturecontrol and flow rate control were integrated in a DAQ board (USB6259, National Instruments, TX, USA) with a self-developed Lab-VIEW program. All the data were recorded in a time interval of 1 s.