Output error of converse piezoelectric fiber voltage sensor caused by optical fiber factors

Han Rui Yang,Yong Jie Zhang,Shi Bo Xu,Lin Lin Xia,Li Qiao,Yi Chang Guo

doi:10.1177/1729881419881521

Han Rui Yang, Yong Jie Zhang + Show 4 more

Open Access

https://doi.org/10.1177/1729881419881521

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Abstract

In fiber voltage sensor, imperfect fiber splicing angle and length difference between the sensing fiber and the compensating fiber usually influence the system output performance. This article established the mathematical model of the system output error using the Jones matrix and analyzed the relationship between the system output error and the above two error factors, respectively. The results show that the angle error of 90° splice has a significant influence on the system output, and the tolerance of angle error varies with different test voltages. When the test voltage is higher than 6 kV, if the expected system error is less than 0.02%, the splicing angle error should be less than 0.15°. Additionally, the length difference also has a significant influence on the system output accuracy. The length difference between sensing fiber and compensating fiber should be less than 1 µm when the test voltage is 110 kV so that the system can meet the accuracy requirements of IEC 0.2s. This research provides a reference for the development of fiber voltage sensor based on the converse piezoelectric effect and also provides a basis for the design of intelligent power detection robot system.

Highlights

Optical fiber sensing has been applied in robot field due to its advantages of long detection distance, short response time, and high resolution.[1]
The results show that the output error depends on the test voltage and decreases with the increase of the test voltage
When the splicing angle error is less than 0.6, the system output error is less than 0.02%

Summary

Introduction

Optical fiber sensing has been applied in robot field due to its advantages of long detection distance, short response time, and high resolution.[1]. Polarized light passes through the sensing fiber twice, so the phase shift detected by the sensor is twice the phase shift generated by the test voltage. The sensing fiber is wound around the quartz crystal to perceive the piezoelectric deformation of the crystal, which makes the phase shift generated between two orthogonal polarization modes of polarized light. The Faraday rotator MF that makes the two orthogonal modes is interchanged by changing the polarization plane of the polarized light and offset the phase shift caused by the external environment changes, and the expression is. The error caused by external interference can be theoretically offset, but it is difficult to achieve in actual because of the imperfect fiber splice and the length difference between the sensing fiber and the compensating fiber. >>>>>< >>>>>: sin4q31⁄21 À cosð2’ þ D’Þþ cos4q31⁄21 À cosð4d þ 2’ þ D’Þþ sin2 2q3 1⁄2cos2d cosð2d þ

Ex 2 666664

Findings

Conclusions