Invention Grant
- Patent Title: Resistance-voltage transformation system for sensors in dynamic strain measurement and structural health monitoring
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Application No.: US15269933Application Date: 2016-09-19
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Publication No.: US09863824B1Publication Date: 2018-01-09
- Inventor: Zhongqing Su , Limin Zhou , Lei Qiu , Hao Xu , Zhihui Zeng , Menglong Liu
- Applicant: THE HONG KONG POLYTECHNIC UNIVERSITY
- Applicant Address: HK Hong Kong
- Assignee: The Hong Kong Polytechnic University
- Current Assignee: The Hong Kong Polytechnic University
- Current Assignee Address: HK Hong Kong
- Agency: Spruson & Ferguson (HK)
- Main IPC: G01L1/00
- IPC: G01L1/00 ; G01L1/18 ; G01M5/00

Abstract:
A resistance-voltage (R-V) transformation system used in dynamic strain measurement for a structure is provided. The system has single-channel (SC) circuit units each for producing a voltage corresponding to a resistance of a sensing element of a structural-strain sensing network. Each SC circuit unit has a R-V transformation module for converting the resistance into the voltage, a band-pass filter module for filtering the R-V transformation module output after a direct-current bias therein is removed, and a high-gain amplification module for amplifying the filter output. The band-pass filter module is configured such that an unwanted low-frequency component induced by resistance drift of the sensing element is removed while allowing a guided-wave signal component to pass through. Particularly advantageous for the sensing network using nanocomposite sensing elements, the R-V transformation system is useful for a wide range of sensor resistance values, mitigating adverse effects of resistance drift, and enabling simplicity in wiring.
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