Analyzing the Responses of a Thermally Modulated Gas Sensor Using a Linear System Identification Technique for Gas Diagnosis

Utilizing the response patterns of a temperature modulated chemoresistive gas sensor for gas diagnosis

“…LDA has been proved to perform successfully on the artificial olfaction responses [15,18]. We applied LDA to the X matrix for dimensionality reduction.…”

“…Staircase waveforms have been used to excite metal oxide gas sensors, resulting in sensitivity and selectivity enhancement when different transient-based feature extraction techniques are used [15][16][17]. Hossein-Babaei et al [18] successfully described the temperature-modulated sensor as a black box based on the recorded input-output relations, and showed that the extracted discriminative information from the simulated responses were sufficient for the recognition of four different volatile organic compounds (VOCs).…”

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

“…Attempts have been made to create selectivity in a single sensor [8]. One of the techniques that's commonly used for creating the capability of selectivity in single sensors is the modulation of sensor temperature [9][10]. Various studies have shown that gas sensors with modulated working temperature yield more discriminant features.…”

“…Babaei and Hosseini-Golgoo applied temperature modulation to the micro-heater of an RGS (as input) and recording temporal responses of a sensor (as output), and modelled the system by a linear system identification technique. Then, they used linear discriminant analysis (LDA) for decreasing dimensions of feature vector of the model [10]. In this work, output model could classify four target gases: Methanol, Ethanol, 2-Propanol and 1-Butanol.…”

Extracting discriminative information from the Padé-Z-transformed responses of a temperature-modulated chemoresistive sensor for gas recognition

“…The sensitivity as well as the response level vary from one target gas to the next, but, in practice, no selective detection is expected from a single sensor as its response to gas A at concentration C A can be similar to that to gas B at a different concentration C B . Different techniques have been used to overcome the lack of selectivity in these sensors [4,[14][15][16][17][18], among which the modulation of their operating temperature is well known [18][19][20][21][22][23][24][25][26][27][28][29].…”