Patent ID: 11921055
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 3:
4. A surface change detection method executed by a detection device configured to detect a change in a surface of an object, comprising:
sweeping a high-frequency signal having a frequency in a predetermined range to irradiate a surface change detection body disposed on the surface of the object, the surface change detection body including a sensor unit configured to resonate with the high-frequency signal, a signal propagation unit configured to propagate the high-frequency signal to the sensor unit, and an incidence and reflection unit configured to receive the high-frequency signal from an outside and output a reflected high-frequency signal reflected from the sensor unit to the outside, wherein the sensor unit comprises a conductive first layer, a conductive second layer, and a dielectric film sandwiched directly between the first layer and the second layer;
analyzing a frequency of the reflected high-frequency signal reflected from the surface change detection body; and
obtaining an amount of change by comparing a peak value obtained in the analyzing with a peak value obtained in a past and determining that there is a change in the surface of the object when the amount of change is equal to or greater than a threshold.