发明名称 Wireless passive radio-frequency strain and displacement sensors
摘要 Wireless strain and displacement sensors wirelessly monitor structural health and integrity, and are made by printing inductor-interdigital capacitor sensing circuits on a variety of substrates, including ceramic substrates, with thermally processable conductive inks. Sensors of the invention can be employed to detect strain and displacement of civil structures, such as bridges and buildings. The sensors include sensing elements that are mounted or printed on stiff, inflexible substrates, which prevent the sensing elements from bending, stretching, or otherwise warping when the sensor is strained. An interlayer between the sensing elements allows the sensing elements to move with respect to each other during application of strain. Thus, strain causes the sensing elements to move but not to deform, causing changes in sensor resonance that can be detected through wireless radio-frequency interrogation. Because the sensing elements do not change shape when under strain, the sensor can undergo millions of measurement cycles before breaking.
申请公布号 US9038483(B2) 申请公布日期 2015.05.26
申请号 US201013394490 申请日期 2010.09.07
申请人 University of Massachusetts 发明人 Nagarajan Ramaswamy;Park Jungrae;Balasubramaniam Sharavanan;Cazeca Mario J.;Sivasubramanian Shivshankar;Mead Joey;Chen Julie
分类号 G01D7/00;G01B7/14;G01R27/04;G01L1/14;G01B7/16;G01B15/06;G01D21/00;G01M5/00;G01L9/00 主分类号 G01D7/00
代理机构 Hamilton, Brook, Smith & Reynolds, P.C. 代理人 Hamilton, Brook, Smith & Reynolds, P.C.
主权项 1. A sensor comprising: (a) a first sensing layer including a plurality of first sensing elements on a first rigid substrate; (b) a second sensing layer including a second sensing element on a second rigid substrate; and (c) an electrically insulating interlayer disposed between the first and second sensing layers, wherein the plurality of first sensing elements and the second sensing element are electromagnetically coupled to each other, wherein a resonance frequency of the sensor varies as a function of relative displacement between the first and second sensing layers, and wherein relative movement between the first and second sensing layers causes a change in a plurality of resonance frequencies associated with the plurality of first sensing elements, thereby directing movement of the first sensing layer relative to the second sensing layer in a plane partitioning the first and second sensing layers.
地址 Boston MA US