| 张 昆,白 清,周晓旭,孙志杰,王 宇,刘 昕,靳宝全.基于中值滤波的 OFDR 二维形状感知精度提升研究[J].电子测量与仪器学报,2022,36(11):186-192 |
| 基于中值滤波的 OFDR 二维形状感知精度提升研究 |
| 2D shape sensing accuracy improvement based on OFDR using median filter |
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| DOI： |
| 中文关键词: 光频域反射 二维形状传感 中值滤波 应变测量 光纤传感 |
| 英文关键词:OFDR 2D shape sensing median filter strain measurement optical fiber sensing |
| 基金项目:山西省重点研发计划(202102150101005)、中国博士后科学基金(2021M691989)、山西省科技创新人才团队专项(201805D131003)项目资助 |
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| 中文摘要: |
| 基于光频域反射(OFDR)的二维形状传感技术存在相干噪声和光谱匹配错位,导致瑞利散射波长偏移曲线出现乱峰、
杂峰,严重影响形状重构精度。 为此,提出一种使用中值滤波的二维形状传感精度提升方法,分析了 Frenet-Serret 标架下的
OFDR 二维形状重构原理和利用中值滤波提升传感精度的基本原理,搭建了 OFDR 二维形状传感系统,通过多组静态应变实验
标定了应变-波长偏移系数,利用中值滤波方法对 3 种预设二维形状的瑞利散射波长偏移曲线进行降噪处理。 实验结果表明,
应变-波长偏移系数标定为 1. 20 με / pm;在 0. 5 m 形状传感长度上,3 种形状传感末端误差分别从 3. 08%、0. 94%、0. 82%降低至
0. 80%、0. 66%、0. 48%。 研究表明,利用中值滤波降噪可以实现 OFDR 二维形状传感系统的感知精度提升。 |
| 英文摘要: |
| The 2D shape sensing based on optical frequency domain Reflectometry (OFDR) is limited by the coherent noise and the
spectral mismatch, and the shape sensing accuracy is seriously restricted with the chaotic and ghost peaks. In this work, we proposed an
accuracy enhancement method for a 2D shape sensing based on OFDR system utilizing a median filter. The measurement principle of the
OFDR is analyzed. Besides, the proposed method and the Frenet-Serret framework are demonstrated. The 2D shape sensing experiment
configuration is set up. And a distributed static strain experiment is conducted to calibrate the strain-wavelength shift coefficient. Then,
the proposed method is used for noise reduction of the Rayleigh backscattering wavelength offset. The experimental results show that the
strain-wavelength offset coefficient is 1. 20 με / pm. At the length of 0. 5 m, the end errors decreased from 3. 08%, 0. 94%, and 0. 82%
to 0. 80%, 0. 66%, and 0. 48%, respectively. It is shown that the 2D OFDR shape sensing accuracy can be improved by proposed
method. |
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