Research Article
Short-Time Fourier Transform and Decision Tree-Based Pattern Recognition for Gas Identification Using Temperature Modulated Microhotplate Gas Sensors
Figure 3
The typical output voltages and heating voltage. (a) The output voltages when the sensor is exposed in three analytes: 50 ppm carbon monoxide, 2000 ppm methane, and 30 ppm ethanol, respectively. (b) The heating voltage is sawtooth modulation waveform at 40 s periods.
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