Optimized temperature modulation of micro-hotplate gas sensors through pseudorandom binary sequences

An RFID reader with onboard sensing capability for monitoring fruit quality

“…The frequencies employed were 12.8, 25.6, 38.5, 92.9, 339.7 and 682.7 mHz. These modulating frequencies are far below of the cut-off frequency of the metal oxide coated membranes, which is the inverse of their thermal response (i.e., 1/20 × 10 −3 s −1 = 50 Hz) [16].…”

Comparison of different feature reduction methods in the improvement of gas diagnosis of a temperature modulated resistive gas sensor

“…This method allows one to feed sensor's heater with variable voltages instead of using sensors at fixed temperature, which is produced by applying fixed voltage on the sensor's heater. This leads to a change in the planned temperature of sensors during the measurement stage [11]. The stage of feature identification includes a vector of inputs which is produced by different methods of linear and non-linear feature reduction either with or without supervision for the next stage (i.e.…”

Important considerations for effective gas sensors based on metal oxide nanoneedles films

“…Strategies based on the modulation of sensor temperature [14], during gas-solid interactions, and its optimization through different methods have been successfully applied to overcome this problematic [15][16][17]. However, from the material perspective the addition of catalyst or functionalization of the MOX (typically with noble metals) is widely studied to improve selectivity, reduce response time, and operating temperature [1,3,18].…”