A temperature compensated three-directional double-loop strain sensor is proposed. A normal fiber Bragg grating (FBG) sensor is surface glued on double-loop titanium alloy substrate, which can improve measurement range of the sensor. The three-directional sensor is made up of three double-loop sensors in three directions so that a two-dimensional strain’s maximum strain value and direction can be detected. With a temperature compensator using a simple FBG and a temperature compensation diaphragm, temperature crosstalk is avoided and the strain sensor’s accuracy is 0.31% with measurement range of 1% (±5000 μϵ), which is seven times larger than normal FBG. In comparison with the common unidirectional strain sensor, this has great value for structural health monitoring.
A design method of a three-direction double-loop strain sensor for two-dimensional (2-D) strain is proposed and analyzed. The strain sensor is made up of three sensing arms and each arm is made of fiber Bragg gratings (FBG) sensor surface glued on titanium alloy substrate. The substrate has double loops to improve the sensor’s measurement range. The strain sensor is unique in that by designing three single arms of strain sensors in different direction, a 2-D strain’s maximum strain value and direction can be precisely determined. In comparison with common unidirectional strain sensor, this has great value for structural health monitoring. With finite element analysis and measurement demonstration, it is shown the measurement range of the strain sensor is increased by seven times compared with normal FBG sensor. The strain sensor’s measurement range can reach 1% (±5000 μϵ) with accuracy of 0.6%. An accurate and real-time monitoring system based on the sensor is presented, which demonstrated the sensor’s fast speed and high reliability.
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