Abstract
For the purpose of improving the sensitivity of the fiber Bragg grating (FBG)-based strain sensor. A novel FBG-based strain sensor with high sensibility was designed by means of a flexible hinge bridge displacement magnification structure. This sensor can be used to accurately measure the strain of a mechanical structure surface. In this paper, the strain sensitization amplification factor of the sensor was calculated by using the flexible matrix method and the strain energy theory. The magnification had been verified by using simulation analysis and experimental results, and the error between theoretical calculation and simulation analysis was less than 7%. The result shows that the strain sensitivity of the sensor is 10.84 pm/με, which is about 10 times to that of the bare FBG sensor. This sensor is sensitive to micro-strain, so it can be well applied to health monitoring of a mechanical system.
Highlights
Nowadays, machinery and equipment are developing in the direction of large-scale, integration, high-speed and automation
Fiber Bragg gratings (FBG) are passive devices based in the modulation of the refractive index, along the optical fiber core
For the fiber Bragg grating (FBG) with a center constant of 0.22, ∆T is the change in ambient temperature, α is the thermal coefficient of the fiber, and wavelength of 1550 nm, the strain sensitivity is 1.2 pm/με, and the temperature sensitivity is 13 ξ is the coefficient of thermal expansion of the fiber
Summary
Machinery and equipment are developing in the direction of large-scale, integration, high-speed and automation. A new type of sensor is proposed, which has very high sensitivity but is small in size, so it is well suited for use in conventional mechanical systems. In this sensor, the flexible hinge bridge displacement amplification structure is used to enhance the sensitivity of fiber grating strain measurement. Compared with the traditional FBG sensor, the sensor proposed in this paper is smaller in size, easier to install and has a very high strain magnification It can be used for high precision measurement of mechanical systems. This article mainly introduces it from the following parts: the principle and mathematical model of sensor, the simulation analysis of sensor sensing characteristics and the experimental analysis
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