研究目的
Investigating the power modulation based fiber-optic loop sensor (FOLS) for displacement measurement with high accuracy and in a large measurement range.
研究成果
A power modulation based fiber-optic loop sensor (FOLS) is assessed theoretically and experimentally. The sensor is based on the principle of the intensity loss from the curved section of a single-mode optical fiber, which provides intermediate peaks due to whispering gallery mode resonances. A modification of Renner’s model is developed by incorporating flexivity term in it to account for deformation in the shape of the loop. The model predictions are validated with experimental data and an agreement is observed. The results show the possibility of using FOLS for displacement measurement.
研究不足
The models are initially limited to predicting the existence of intermediate peaks at certain loop radii in circular loops and are not suitable for the physical concept of a deforming fiber loop. The effect of elato-optic correction factor becomes significant at small loop radii, and small variations can cause significant changes in the predictions.
1：Experimental Design and Method Selection:
The study involves developing a theoretical model for the Fiber-Optic Loop Sensor (FOLS) and validating it with experimental data. The sensor is based on the principle of intensity loss from the curved section of a single-mode optical fiber.
2：Sample Selection and Data Sources:
Corning SMF 28e optical fibers are used in the experimental setups.
3：List of Experimental Equipment and Materials:
The setup includes a 1310 nm single wavelength laser source (Thorlabs S1FC1310), a 90%/10% optical splitter (Fico P/N FC-210R1-8A), two photodetectors (Thorlabs DET410 and Newport 71617), a data acquisition board (National Instruments NI USB-6221 DAQ), a translational stage (Thorlabs MTS25/M), a CMOS camera (Nikon D7000), and a computer for instrument control, data logging and processing.
4：Experimental Procedures and Operational Workflow:
Experiments are conducted in two configurations: changing the radius of a circular loop and deforming the loop against a rigid anvil. A digital camera is used to measure the loop radius via image analysis.
5：Data Analysis Methods:
The transmitted intensity is measured and compared to theoretical predictions from Marcuse and Renner models, including modifications to account for loop deformation.
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