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A new optical fiber sensor to monitor resin flow was developed with general single mode fiber. The sensor was made of usual multi-model optical fibers. The working principle and the method fabricated the sensors were introduced. The sensor was used to monitor the actual resin injection process. The results show that the optical sensors presented in...
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Citations
The signal detection technique to control the working-point by closed-loop is an effective method of interferometric fiber-optic sensors. The arithmetic of signal demodulation is improved based on the traditional method, which achieves the wider dynamic range, the bigger speed of detection and the higher precision of demodulation. The demodulation error is analyzed and simulated theoretically. The conclusion is that the measurable amplitude of the dynamic phase change and the permitted varying range of the working-point restrict each other. To validate the improved arithmetic, a simple Mach-Zehnder interferometer is designed. The experimental results have proved its correctness.
Based on dual peak resonance of long-period fiber grating (LPFG), a novel film sensor is presented, in which the film that is sensitive to the surrounding gases is coated on the cladding of the fiber grating region, and the intervals of dual peak resonant wavelengths change with the film refractive index. According to the coupled-mode theory, a triple-clad numerical model is developed to analyze the relationship between the sensitivity and the thin film optical parameters (the film thickness and the refractive index) and the fiber grating parameters (the grating period and the core index modulation). By using the optimization method, the optimal film optical parameters and the grating structure parameters are obtained. Data simulation shows that the sensitivity of this scheme to refractive index of the films is predicted to be more than 10-7.
