Resistive gas sensor and gas sensing method therefor
AssigneeIndustrial Technology Research Institute
InventorsYing-Che LO, Yu-Sheng LIN, Ting-Hao HSIAO
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Abstract
A resistive gas sensor is provided. The resistive gas sensor includes a sensing circuit and a determination circuit. The sensing circuit senses a gas to generate a detection signal. The determination circuit performs a frequency-division operation on the detection signal by a frequency-division parameter to generate a frequency-division signal, counts a half of a period of the frequency-division signal to generate a half-period count value, and determines concentration of the gas according to the half-period count value. The determination circuit determines the frequency-division parameter according to the half-period count value.
Claims14
A resistive gas sensor comprising:
- a sensing circuit sensing a gas to generate a detection signal;
- and
- a determination circuit performing a frequency-division operation on the detection signal with a frequency-division parameter to generate a frequency-division signal, counting a half of a period of the frequency-division signal to generate a half-period count value, and determining concentration of the gas according to the half-period count value,
- wherein the determination circuit determines the frequency-division parameter according to the half-period count value.
A gas sensing method for a resistive gas sensor comprising:
- sensing a gas through the resistive gas sensor to generate a detection signal;
- performing a frequency-division operation on the detection signal with a frequency-division parameter to generate a first frequency-division signal;
- counting a half of a period of the first frequency-division signal to generate a first count value;
- determining whether the first count value is less than a lower threshold value;
- when it is determined that the first count value is less than the lower threshold value, increasing the frequency-division parameter;
- performing the frequency-division operation on the detection signal with the increased frequency-division parameter to generate a second frequency-division signal;
- counting a half of a period of the second frequency-division signal to generate a second count value;
- and
- determining concentration of the gas according to the second count value.
Dependencies are inferred from the claim text.