Abstract
Fibre optical sensors (FOS) have been paid a lot of attention because of innate immunity of electro-magnetic interference (EMI) and high precision, especially like Fabry-Perot (F-P) cavity fibre sensor which is tiny and sensitive. However, FOS hasn’t taken place of traditional electric sensors for its complex and expansive demodulation of optical signal. A new demodulation method using white light polarization interference controlled by voltage is proposed in this paper. In the system, a birefringence crystal plays a pivotal role in making optical path difference (OPD) between ordinary linear light and extraordinary linear light. When the OPD compensated with the length of F-P cavity, the output signal produces fringe patent. The OPD between the two orthogonal linear polarized lights is also controlled by an electronic field acted on the birefringence crystal. According to the Pockels effect, the change of ODP is linearly depended on intensity of electronic field. The length of cavity can be calculated by a voltage scanning. The mathematic model of voltage controlled demodulation is derived and the simulation result is discussed. At last, fabrication processes are described and the key parameters are given.
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