Novel approach to measure the linear birefringence in bulk optical glass sensing head of current sensors

<title>Effects of reciprocal parameters upon a FMOCT</title>

“…This means that the elliptical degeneration of the output light is very little, and the polarization state of the output light is still linear. For the ZF-7 optical glass, the typical value of the RIR in each reflecting surface is about 61° [6j, and the typical measuring value [7] of " is about 0.08 rad, when the wavelength is 1310 nm and the reflecting angle is 45°. Then using Eqs.…”

Method for measuring linear birefringence inside bulk glass current-sensing elements

“…Therefore, it is of great importance to measure the LB inside the optical currentsensing heads in order to improve the design and properties of optical current sensors. The present authors have reported two methods in the process of research into the measuring principles and methods of LB inside optical current-sensing heads [2,3]. The method reported in reference [2] can measure only the sinusoidal value of the LB by adjusting the directions of the transmitting axes of the polarizer and the analyser to get two values of output light intensities, which cannot uniquely determine the value of the LB because of the multivalued nature of the arcsin function.…”

“…The present authors have reported two methods in the process of research into the measuring principles and methods of LB inside optical current-sensing heads [2,3]. The method reported in reference [2] can measure only the sinusoidal value of the LB by adjusting the directions of the transmitting axes of the polarizer and the analyser to get two values of output light intensities, which cannot uniquely determine the value of the LB because of the multivalued nature of the arcsin function. The method reported in reference [3] employs the same measurement system with a more complicated method than that reported in this paper.…”