GAS DETECTION APPARATUS AND GAS DETECTION METHOD USING DETECTOR AND MODULATOR

A gas detection device and process detect a combustible target gas. A detector chamber (6) encloses a detector (10), and a modulator chamber (5) encloses a modulator (15). The target gas can flow from an area to be monitored through into the modulator chamber and from the modulator chamber into the detector chamber. An electrical voltage is applied to the modulator and to the detector to heat them, oxidizing the target gas in the modulator chamber and in the detector chamber. Heat energy is released bringing about an increase of the temperature of the detector. A detector sensor measures a detection variable which depends on the detector temperature. The voltage is applied to the modulator such that the temperature of the modulator oscillates. An analysis unit checks whether the detection variable oscillates synchronously with the modulator temperature, indicating the target gas is present.