| 摘要 |
The method and system disclosed in the publication relates to an improvement in measurement accuracy of a gas concentration sensor (1) such as capacitive humidity sensor (1), the method comprising the steps of measuring a parameter of the sensor (1), such as its resistance or capacitance, that is sensitive to the gas or its concentration being measured, and simultaneously changing the temperature of the sensor (1) in a cyclic manner. According to the invention, the parameter of the sensor (1) being measured is measured at least essentially continuously, at least N times during each heating cycle, the measured parameter value is filtered to obtain a signal component associated with the fundamental frequency of the heating cycle for use at a later step, and the thus filtered signal component is used in the correction and/or calibration of actual output signal of the sensor.
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