DESIGN AND DEVELOPMENT OF A FIBER OPTIC INTRINSIC VOLTAGE SENSOR |
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| S. K. Ghosh, S. K. Sarkar, S. Chakraborty |
- Abstract:
- A direct and alternating voltage measurement scheme utilizing optical polarization phenomena has been reported. Accordingly a single mode fiber optic sensor has been developed which is intrinsic in nature. A polarization phase shift can be observed between input and output laser light when S.M. fiber of sufficient length is subjected to optimum electric field. The phase shift is due to electrostriction and electro optic Kerr effect. The phase shift is measured through polarization sensitive detection. Voltages (DC & AC) are calibrated in terms of phase shift. Theory has been formulated to depict the variation of phase shift with impressed alternating voltage on the set-up. Closeness between theoretical and experimental results is encouraging. The range of voltage measured through this technique is up to a few hundred volts for DC and AC with resolution of 1 Volt. As per construction of the fiber sensor sensitivity is dependent on the length of the fiber and spacing between electrodes. To minimize the measurement error referencing technique is preferable, at the same time to remove the nonlinear relationship between input and output ANN based linearization technique has been employed.
- Keywords:
- Fiber optic sensor, Electrostriction, Kerr effect, polarization
- Download:
- IMEKO-TC4-2002-194.pdf
- DOI:
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