Three-electrode acetylene sensor of carbon nanotube film and concentration measurement method thereof

The invention discloses a three-electrode acetylene sensor of a carbon nanotube film and a concentration measuring method thereof. The sensor comprises a first electrode, a second electrode and a third electrode, wherein the three electrodes are sequentially distributed; the first electrode is provided with an air vent, and the inner surface of the first electrode is bonded with a substrate distributed with the carbon nanotube film; the center of the second electrode is provided with an extraction hole; the panel of the third electrode is provided with a blind hole; and the three electrodes are mutually isolated. The method comprises the following steps of: (1) placing the acetylene sensor, a temperature sensor and a humidity sensor with different electrode distances in acetylene gas to be measured; (2) applying voltages to the electrodes; (3) measuring the ion flow value of each sensor; (4) constituting the measured ion flow values and the calibration values of acetylene concentration, temperature and humidity into a sample, and fabricating the sample and an interpolation sample into a gas concentration measurement database; (5) fabricating a data fusion instrument, and establishing an acetylene concentration measurement model; and (6) inputting the actual measurement value of the sensor into the measurement model to obtain the accurate acetylene concentration measurement value. The sensor disclosed by the invention has the advantages of high acetylene concentration sensitivity, good linearity and high accuracy.