Work

Sensing Accuracy Enhancement of Phase-Sensitive Optical Frequency Domain Reflectometry Using Hybrid Hampel-Median Filter

Year: 2025

Type: article

Abstract: We propose a novel filter scheme to enhance the sensing accuracy of phase-sensitive optical frequency domain reflectometer (Φ-OFDR) while maintaining high spatial resolution via cascading Hampel filter and median filter. The working principle is theoretically analyzed and optimal filtering parameters are analyzed with the practical experimental configuration. Experimental results demonstrate that the proposed method achieves a temperature accuracy of 0.49°C, indicating a 28 dB enhancement compared with the raw data while maintaining 4.6 mm spatial resolution. Compared to other conventional filtering methods applied in Φ-OFDR, the proposed hybrid Hampel-Median filter yields about 2∼4 times improvement in sensing accuracy and increases SNR by more than 5 dB with consistent spatial resolution condition. On the other hand, the proposed filtering method enhances the spatial resolution about 2∼6 times with the same sensing accuracy. The experimental results reveal that the novel filtering approach enables high sensing accuracy and spatial resolution for the distributed temperature or strain sensing scenarios of Φ-OFDR, without any hardware modifications.

Source: IEEE photonics journal

DOI: 10.1109/jphot.2025.3635712

Authors: Yiheng Cheng, Qinlin Zeng, Fei Liu, Fei Cui, Zhi Wang, Dan Li, Benzhang Wang, Xian Zhou

Institution: University of Science and Technology Beijing

Language: English

Topic: Advanced Fiber Optic Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,075

Funders: National Natural Science Foundation of China, Natural Science Foundation of Beijing Municipality