Method for controlling the substrate temperature of a chemoresistive gas-analytical multisensor: justification of pulse-width modulation signal parameters

This work proposes a improved method for maintaining the thermal regime of heating elements in chemoresistive gas sensor substrates, presenting experimental data on heating inertia modes and heater operation limits during substrate temperature maintenance via pulse-width modulation control. The primary goal was to substantiate pulse-width modulation parameters for substrate temperature control in chemoresistive gas multisensors, addressed through analyzing a generalized microheater-to-pulse-width modulation generator connection diagram, designing and manufacturing a hardware-software unit for controlling substrate heating in multisensors with different microheater characteristics, and conducting experimental research on heating multisensor substrates to 300 °C. The study describes and substantiates approaches for calculating required pulse-width modulation signal parameters, concluding that the pulse-width modulation pulse period depends on the duty cycle percentage determined by generated signal points, defining parameters that ensure stable temperature maintenance and emphasizing the importance of selecting an optimal pulse-width modulation signal frequency.

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