PROBLEM TO BE SOLVED: To enable a simultaneous measurement to be carried out stably by suppressing mutual interferences between channels.;SOLUTION: A grounded type oscillation circuit, which oscillates in such the state that one electrode of its oscillator X is grounded, is adopted as an oscillation circuit to be applied to a multi-channel QCM sensor, thereby preventing any electromagnetic wave from propagating to another channel and interfering with it although oscillations simultaneously take place on a plurality of channels. In the QCM sensor having two or more channels, one channel of the two or more channels is used as a measurement channel, and one channel is used as a reference channel, and a difference between the oscillation frequency of the measurement channel and the oscillation frequency of the reference channel is used as a sensing/quantitating frequency signal.;COPYRIGHT: (C)2009,JPO&INPIT
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