Simplified and universal resistance response of gas sensor of IoT circuit platform
| Autor: | T.S. Liao, L. J. Lee, H. N. Lin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Microheater
0303 health sciences business.industry Electrical engineering 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology law.invention Bluetooth 03 medical and health sciences Microprocessor Control theory law Electrical resistivity and conductivity Medicine Current (fluid) 0210 nano-technology business 030304 developmental biology Voltage |
| Zdroj: | I2MTC Web of Science |
| DOI: | 10.1109/i2mtc.2019.8826944 |
| Popis: | Simplified and universal circuit platform for determining the sensed resistance of gas sensor is presented herein. It applies a constant voltage across the gas sensor exposure of the sensor to the ionizing radiation. Subsequently, it measures and converts the current passing through the sensor proportional to the conductivity or resistivity of the sensor, which in turn is proportional to the gas concentration in the sensor, into a proportional analog voltage value. If the analog voltage value is to be converted into a digital value, the analog/digital values obtained prior to and after exposure of the sensor are to be compared to the sensing resistance response, and the sensing resistance response based on the change in the analog/digital values is to be computed. The electronic device for determining the sensing resistance comprises an adjustable current of LED driver, heater controller, gas sensor, constant voltage source, differential current-to-voltage converter, Bluetooth module, analog-to-digital converter connected to the microprocessor, and a digital-to-analog converter of the microprocessor that can be connected to the LED driver / microheater and fan to the extracting gas. The circuit platform can detect a resistance range of $300 k\Omega$ to $1 G\Omega$ of the gas sensor. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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