Baseline Correction Method of FBG Sensor Network Spectrum based on the Improved LSTM Model

HAN Ying; ZHANG Xu; YU Mingxin; ZHUANG Wei

doi:10.13756/j.gtxyj.2024.230032

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Baseline Correction Method of FBG Sensor Network Spectrum based on the Improved LSTM Model

更新时间：2024-08-05

- Baseline Correction Method of FBG Sensor Network Spectrum based on the Improved LSTM Model
- Study on Optical Communications Issue 4, Pages: 23003201-23003208(2024)
- 作者机构：
  
  1.北京信息科技大学　光电测试技术与仪器教育部重点实验室，北京　100192
  2.北京信息科技大学　光纤传感与系统北京实验室，北京　100016
  3.天津大学，天津　300072
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2024.230032
  CLC： TN929
- Published：10 August 2024，
  
  Received：01 May 2023，
  
  Revised：16 May 2023，
- 稿件说明：
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韩颖，张旭，于明鑫，等. 基于改进LSTM的FBG传感网络光谱基线校正方法[J]. 光通信研究，2024(4)：230032.

Han Y, Zhang X, Yu M X, et al. Baseline Correction Method of FBG Sensor Network Spectrum based on the Improved LSTM Model [J]. Study on Optical Communications, 2024(4)：230032.
韩颖，张旭，于明鑫，等. 基于改进LSTM的FBG传感网络光谱基线校正方法[J]. 光通信研究，2024(4)：230032. DOI： 10.13756/j.gtxyj.2024.230032.

Han Y, Zhang X, Yu M X, et al. Baseline Correction Method of FBG Sensor Network Spectrum based on the Improved LSTM Model [J]. Study on Optical Communications, 2024(4)：230032. DOI： 10.13756/j.gtxyj.2024.230032.

摘要

【目的】

针对复杂外界环境所致的光纤布拉格光栅（FBG）光谱信号基线漂移问题，文章提出了一种基于改进的长短期记忆（LSTM）模型的光谱基线校正方法。

【方法】

改进的LSTM模型由卷积神经网络（CNN）、全连接层和LSTM网络组成。CNN与LSTM模型相比，改进的LSTM模型利用CNN提取FBG光谱信号的特征信息。文章使用仿真数据集和实测数据集对改进的LSTM模型进行训练。仿真数据集由特征噪声、基线和FBG光谱组成。分别使用小波软阈值法、惩罚最小二乘法、循环神经网络（RNN）法、LSTM法和改进的LSTM法进行基线校正。使用FBG传感信号存活率和均方根误差（RMSE）对5种方法的校正结果进行评价。

【结果】

使用仿真数据集对LSTM模型进行训练与测试，改进的LSTM模型将FBG传感信号存活率提高了60.8%。采用仿真数据集对模型进行预训练后，再将使用实测数据集对经过预训练的模型进行训练得到的改进LSTM模型与直接使用实测数据集训练的模型相比，改进的LSTM模型具有更好的校正效果。FBG光谱的RMSE降低了10.95%，RMSE的标准差降低了4%。使用改进的LSTM模型对FBG光谱实测数据集进行校正，FBG传感信号存活率提高了50.5%。与小波软阈值法、惩罚最小二乘法、RNN法和LSTM法相比，改进后的LSTM模型具有更好的校正效果，RMSE的均值和标准差分别为0.012 2和0.002 4。解调中心波长的RMSE为0.036 pm，并且基线校正过程只需9.68 ms。

【结论】

改进的LSTM模型是一种有效的基线校正方法，在复杂外部环境下具有广阔的应用前景。

Abstract

【Objective】

The baseline drift of the Fiber Bragg Grating (FBG) spectral signal is usually one of the main problems

caused by the complex external environment. A spectral baseline correction method based on the improved Long Short Term Memory (LSTM) model is proposed in this paper.

【Methods】

Compared with LSTM model

the improved LSTM model extracts feature information of FBG spectral signal by the Convolutional Neural Network (CNN). The improved LSTM model is composed of CNN

full connection

and LSTM network. In this paper

the improved LSTM model is trained by artificial datasets and measured datasets. The artificial datasets are made up of feature noise

baseline

and FBG spectroscopy. Five methods including wavelet soft threshold method

penalty least square method

Recurrent Neural Network (RNN)

LSTM

and the improved LSTM model are used as baseline correction. Identification signal probability and Root Mean Square Error (RMSE) are used to evaluate correction results by the five methods.

【Results】

The artificial datasets of FBG signal are corrected by the improved LSTM model

and the identification signal probability is increased by 60.8%. The improved LSTM model with training by artificial datasets and measured datasets shows better correction results

compared with training by measured datasets. The mean of the RMSE for FBG spectrum decreases by 10.95%. The standard deviation of RMSE decreases by 4%. The measured datasets of FBG signal are corrected by the improved LSTM model

and the identification signal probability is increased by 50.5%. Compared with wavelet soft threshold method

penalty least square method

RNN and LSTM

the improved LSTM model shows best correction results. The mean values of RMSE and the standard deviation of RMSE are 0.012 2 and 0.002 4

respectively. The RMSE value of the demodulated central wavelength is 0.036 pm. And the baseline correction process takes only 9.68 ms.

【Conclusion】

The improved LSTM model is an effective method to achieve baseline correction

and has wide range of application prospects in complex external environment.

关键词

光纤布拉格光栅光谱基线校正改进长短期记忆模型深度学习

Keywords

FBGspectral baseline correctionimproved LSTM modelsdeep learning

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