![]() Then, the influence of deformation of quartz crystal under the vibration stress on the output performance of RFOVS system was analyzed. In this paper, the non-reciprocal error mathematical model of RFOVS system was established. Therefore, in the practical application, it is an important to solve the environmental adaptability problem of RFOVS to deeply study the vibration characteristics of quartz crystal and explore the relationship between vibration stress and output accuracy of RFOVS system. The additional devices also reduce the reliability of the system. In addition, due to the limitation of the fabrication process, the double crystal compensation scheme cannot guarantee the identical crystal parameters. There are little reports on the vibration performance of RFOVS system. However, the research on OVS mainly focuses on thermal induced error at present. In practical applications, quartz crystal deformation is easily affected by the environment, such as ambient temperature and external vibration. The length of sensing fiber wound on quartz crystal can be changed due to the deformation of the quartz crystal, which ultimately affects the output of the RFOVS system. It is well known that the quartz crystal is the core device of direct sensitive voltage in RFOVS. This error was analyzed in depth and proposed a relevant suppression method in the previous study. The reciprocity error become more significant and complicated under the influence of external environmental disturbance. However, it is difficult to achieve the same length for the two-part optical fiber in the actual process, so the non-reciprocity error is introduced. Theoretically, the structure is reciprocal and can completely offset the influence of external disturbance factors on the optical path. In this structure, a compensation fiber of equal length is spliced at 90 ∘ to the axis after the sensing fiber. Īsea Brown Boveri (ABB) company proposed a reflective fiber optic voltage sensor (RFOVS) by using the non-reciprocity principle of Faraday rotator. In addition to the quartz crystal, the system no longer needs other discrete optical components, which has advantages in improving the stability and reliability of the long-term operation of the system. Optical fiber is used for signal transmission and detection. It does not require optical lens system (lens, polarizer, analyzer, wave plate) and optical collimation. Compared with the electro-optic crystal OVS based on the Pockels effect, the all-fiber OVS based on the converse piezoelectric effect has a simple optical system structure. At present, OVS research mostly included the electro-optic crystal OVS based on the Pockels effect and the all-fiber OVS based on the converse piezoelectric effect. The optical voltage sensor (OVS), with its outstanding advantages such as high safety performance, excellent insulation performance, no magnetic saturation, large dynamic range, and so on, is gradually replacing traditional voltage transformer. With the continuous improvement of voltage levels, traditional electromagnetic transformers have gradually revealed their drawbacks in terms of measurement range, insulation protection, and application range. The voltage sensors play an extremely important role in fields of power measurement and relay protection. This paper provides the parameter optimization and design guidance for improving the anti-mechanical vibration performance of the sensor head of the fiber optic voltage sensor and provides a theoretical basis for the suppression method of the system error. In addition, the size and deformation parameters of the quartz crystal are related to the output error of the sensor system. Among them, the deformation of the crystal radial circumference is the main reason to influence the system output accuracy. The results show that the vibration stress along the axial direction mainly causes the quartz crystal to deform in height, and the vibration stress along the radial direction mainly causes the quartz crystal to deform the circumference. Furthermore, the effect of additional quartz crystal deformation on the output precision of the system is calculated. In this paper, the influence of different vibration directions on quartz crystal deformation is analyzed by the finite element method based on the analysis and derivation of the system error mathematical model of the quasi-reciprocal reflected fiber optic voltage sensor. The additional deformation of the quartz crystal under the vibration stress disturbance greatly affects the measurement accuracy of the fiber optic voltage sensor. 16 Institution of Aerospace & Technology Corporation, Xi’an, China 1School of Automation Engineering, Northeast Electric Power University, Jilin, China.Hanrui Yang 1, Yichang Guo 1, Shibo Xu 1, Linlin Xia 1, Wei Hong 2, Chunjun Dong 1 and Shengxi Jiao 1* ![]()
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