A fiber loop scale factor testing method based on distributed optical testing

By combining a high-performance OFDR testing system with a polarization diversity structure, the accuracy problem of scaling factor measurement of fiber optic gyroscopes under rapid temperature change conditions was solved, thereby improving the performance of fiber optic gyroscopes and optimizing the manufacturing process.

CN122149525APending Publication Date: 2026-06-05GUANGDONG UNIV OF TECH
View PDF 6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Filing Date
2026-02-05
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies cannot accurately measure the scaling factor of fiber optic gyroscopes under rapid temperature changes, which affects the overall performance of fiber optic gyroscopes and the improvement of manufacturing processes.

Method used

A high-performance OFDR testing system was used to acquire two orthogonally polarized signals, P and S, under normal temperature and rapid temperature change conditions through a polarization diversity structure. Autocorrelation and cross-correlation demodulation were performed, and combined with signal filtering, wavelet denoising and sliding window processing, the temperature and strain parameters were decoupled, and the scaling factor of the fiber ring was calculated.

Benefits of technology

This technology enables accurate measurement of the scaling factor of the sensing ring of a fiber optic gyroscope under rapid temperature changes, guiding the research and development and production process adjustment of fiber optic gyroscopes, and improving the temperature performance and stability of fiber optic gyroscopes.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122149525A_ABST
    Figure CN122149525A_ABST
Patent Text Reader

Abstract

The application provides a kind of fiber loop scale factor testing method based on distributed optical testing, belongs to optical measurement and optical fiber sensing technical field.The method: using optical frequency domain reflectometer to test fiber loop under normal temperature and fast temperature change, then the test signals under two different temperature states are self-correlated and cross-correlated demodulated, realize temperature / strain decoupling, peel off the distributed temperature parameters of fiber loop, then the distributed strain parameters are substituted into scale factor calculation formula, then the scale factor values of fiber loop under fast temperature change can be obtained by accumulating the calculated scale factor along the length.The application can realize the quantitative measurement of scale factor of fiber optic gyroscope sensitive ring under fast temperature change, and the scale factor of fiber optic gyroscope sensitive ring is the core to ensure the angular velocity-signal conversion accuracy of gyro system, directly determines the reliability of linear mapping relationship between gyro output and actual rotation input, and plays an important role in the winding process optimization of fiber optic gyroscope sensitive ring.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Optical fiber ring quality measurement method and its device for optical fibre gyroscope

    CN101339093A

  • Optical fiber sensitive ring bidirectional synchronous measurement device and method based on Sagnac structure

    CN112082735A

  • Distributed high-precision strain measurement method under temperature change condition of optical fiber sensitive ring

    CN115452213A

  • Method for reducing scale factor temperature sensitivity of fiber-optic gyroscope and fiber-optic gyroscope

    CN115824265A

  • Optical fiber sensitive ring temperature performance evaluation and test device

    CN205879202U