Measurement device and measurement method and measurement program therefor

A measurement method using a measurement device including a plurality N (N≥2) of capacitive sensors configured to measure a capacitance change associated with an object, the method comprising:

• controlling, by using switches, connection states between the N capacitive sensors and a plurality M (M<N) of detection circuits in accordance with preset scan matrices so as to, in each measurement, select a predetermined combination of sensors from among the N capacitive sensors and output a plurality M of detection values to corresponding M output terminals, based on measurement values provided from the selected sensors;
• acquiring, with the M detection circuits, the M detection values from the M output terminals in each measurement in accordance with preset measurement intervals, each of the M detection values includes a time-dependent noise component depending on a measurement time at which the measurement is performed;
• executing L measurements in succession at the preset measurement intervals such that the L measurements are completed before an assumed environmental change occurs;
• and
• after the L measurements have been performed to acquire M×L detection values, applying a predetermined correction matrix to generate M×L corrected detection values in which the time-dependent noise component in each of the M×L detection values is replaced by a common noise component which is obtained by averaging the time-dependent noise components across the L measurements.

A non-transitory computer-readable storage device, tangibly embodying a measurement program for a measurement device including a plurality N (N≥2) of capacitive sensors configured to measure a capacitance change associated with an object, the storage device being configured to cause a computer to execute process steps, the process steps comprising:

• controlling, by using switches, connection states between the N capacitive sensors and a plurality M (M<N) of detection circuits in accordance with preset scan matrices so as to, in each measurement, select a predetermined combination of sensors from among the N capacitive sensors and output a plurality M of detection values to corresponding M output terminals, based on measurement values provided from the selected sensors;
• acquiring, with the M detection circuits, the M detection values from the M output terminals in each measurement in accordance with preset measurement intervals, each of the M detection values includes a time-dependent noise component depending on a measurement time at which the measurement is performed;
• executing L measurements in succession at the preset measurement intervals such that the L measurements are completed before an assumed environmental change occurs;
• and
• after the L measurements have been performed to acquire M×L detection values, applying a predetermined correction matrix to generate M×L corrected detection values in which the time-dependent noise component in each of the M×L detection values is replaced by a common noise component which is obtained by averaging the time-dependent noise components across the L measurements.