To provide a capacitance-type gas/liquid detector by which a change in a capacitance caused by a liquid coming into contact with a sensor can be detected surely and easily.
This gas/liquid detector 10 for an ionic liquid is provided with a capacitance-type sensor 11. The gas/liquid detector is provided with a capacitance detector 25 which applies an AC voltage to the sensor and which measures its capacitance. The capacitance-type sensor 11 contains a pair of electrodes 13, 15 with which the ionic liquid 12 can come into contact. When the AC voltage is applied, a Debye element 51 and a Debye element 53 are formed around the electrodes by an electric-charge diffusion double layer. When the amplitude of the AC voltage is set to be sufficiently lower than a voltage by which the Debye elements 51, 53 do not become preferentially capacitive, a gas/a liquid can be detected with comparatively high detecting sensitivity.
LESLIE A FIELD
BARTH PHILLIP W
HOEN STORRS T
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