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This paper presents a low-power wireless strain sensor that can be remotely powered by a light source and can be dynamically interrogated with a low-cost wireless interrogator. Based on a conventional thin-film strain gauge, the wireless sensor is capable of measuring both static and vibration deformations. The low-power wireless operation was achieved via amplitude modulation of the antenna backscattering...
The effect of cladding mode frustrated total internal reflection (CMFTIR) in macrobend polymer optical fiber is first used to achieve continuous liquid-level dynamic sensing. However, the difficulty is that the CMFTIR sensing signal is so weak as to be drowned into background noises. To solve this problem, the sensors with the parallel (twisted) helical macrobend coupling structure (PHMBCS and THMBCS)...
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