公开(公告)号：US20210285843A1

公开(公告)日：2021-09-16

申请号：US16332470

申请日：2017-09-12

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Benjamin J. MUENSTERMANN ,  Christian WEINMANN ,  Bernd KUEHNEWEG ,  Andrea DEN DRIJVER ,  Ivan V. NESHATAEV ,  Walter TESCH ,  Zohaib HAMEED ,  Mohsen SALEHI

IPC: G01M5/00 ,  G06K7/10 ,  B64F5/60

Abstract: A method for monitoring the surface of a device to physical and/or environmental exposure, the method comprising: • (a) attaching at least one sensor including a reactance autotuning integrated circuit to a surface of a device; • (b) attaching a reader in proximity to the sensor; • (c) measuring a reference reactance of the sensor with the reader at a selected frequency; • (d) continually monitoring for changes in the reactance of the sensor at the selected frequency, wherein changes to the reactance are digitized by the autotuning circuit; and • (e) comparing differences between the reference reactance and changes to the monitored reactance to determine if said surface of the device has been subjected to physical and/or environmental exposure.