The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2015
Filed:
Sep. 07, 2010
Ramaswamy Nagarajan, Westford, MA (US);
Jungrae Park, Andover, MA (US);
Sharavanan Balasubramaniam, Lowell, MA (US);
Mario J. Cazeca, Hudson, NH (US);
Shivshankar Sivasubramanian, Lowell, MA (US);
Joey Mead, Carlisle, MA (US);
Julie Chen, Wilmington, MA (US);
Ramaswamy Nagarajan, Westford, MA (US);
Jungrae Park, Andover, MA (US);
Sharavanan Balasubramaniam, Lowell, MA (US);
Mario J. Cazeca, Hudson, NH (US);
Shivshankar Sivasubramanian, Lowell, MA (US);
Joey Mead, Carlisle, MA (US);
Julie Chen, Wilmington, MA (US);
University of Massachusetts, Boston, MA (US);
Abstract
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.