SENSING DEVICE

摘要

It is an object of the present invention to prevent the deterioration in measurement precision even when the frequency of a piezoelectric resonator changes due to a factor other than the adsorption of a substance to be sensed, in a sensing instrument including a sensing sensor provided with the sensing piezoelectric resonator on whose front surface an adsorption layer for adsorbing the substance to be sensed is formed and which changes in natural frequency by the adsorption of the substance to be sensed. In the present invention, a sensing instrument includes: a reference sensor including a reference piezoelectric resonator not adsorbing a substance to be sensed; a reference oscillator circuit oscillating the reference piezoelectric resonator; a measuring unit receiving an oscillation output of a sensing oscillator circuit and an oscillation output of the reference oscillator circuit in a time-series manner to measure frequencies of the oscillation outputs of the oscillator circuits; and a data creator creating time-series data of a difference between a frequency in a sensing sensor and a frequency in the reference sensor, based on the frequencies of the oscillation outputs of the oscillator circuits obtained by the measuring unit. Therefore, a frequency change due to a factor other than the adsorption of the substance to be sensed is cancelled.