Thermal aging-induced evolution of the spectral transmission characteristics of fiber bundles for optical partial discharge detection
- 1Yanzhao Electric Power Laboratory, North China Electric Power University
- 2Hengshui Power Supply Branch, State Grid Hebei Electric Power Co., Ltd
Abstract
Fiber bundles serve as optical transmission channels in partial-discharge (PD) detection systems, and thermal aging may alter the spectra acquired by external detectors. This study investigated the spectral-response evolution of a silica-based fiber bundle after thermal aging at 85 °C for 0, 24, 72, 168, and 336 h. A simulated-chamber platform using an integrating-sphere broadband source was established to acquire output spectra over 200–920 nm through segmented scanning and stitching. Three repeated measurements, dark-background subtraction, band-integrated output attenuation relative to the unaged state, normalized spectral profiles, and band contribution ratios were used to evaluate output-amplitude loss and spectral redistribution. All analyzed bands showed reduced measured output after aging, with strongly wavelength-dependent attenuation. At 336 h, the attenuation reached 95.6% in the 200–320 nm band and 93.5%–96.4% above 600 nm, compared with 72.6% in the 320–440 nm band. The contribution ratio of the 320–440 nm band increased from 26.3% to 52.7%, indicating comparatively better retention rather than improved transmission. Non-monotonic variations in several bands were not interpreted as material recovery and may reflect residual measurement and coupling variability. A preliminary needle–plate discharge test showed that the fiber bundle aged for 336 h could still transmit detectable optical signals, with a relatively strong response in the 320–440 nm region. These case-based results support the 320–440 nm region as a preferred remaining response window for the tested bundle and provide a basis for band selection, aging calibration, and transmission-margin design.
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BibTeX
@article{pei2026thermal,
title = {{Thermal aging-induced evolution of the spectral transmission characteristics of fiber bundles for optical partial discharge detection}},
author = {Shaotong Pei and Ruifeng Zhou and Hongyu Di and Xiaomeng Yang and Zhongxing Zhang and Lei Zhao and Changyu You and Weiping Fu and Siyuan Chen},
journal = {Scientific Reports},
year = {2026},
month = jul,
doi = {10.1038/s41598-026-63509-9},
url = {https://doi.org/10.1038/s41598-026-63509-9},
note = {CC BY},
}
RIS
TY - JOUR
TI - Thermal aging-induced evolution of the spectral transmission characteristics of fiber bundles for optical partial discharge detection
AU - Shaotong Pei
AU - Ruifeng Zhou
AU - Hongyu Di
AU - Xiaomeng Yang
AU - Zhongxing Zhang
AU - Lei Zhao
AU - Changyu You
AU - Weiping Fu
AU - Siyuan Chen
PY - 2026
DA - 2026/07/01
JO - Scientific Reports
DO - 10.1038/s41598-026-63509-9
UR - https://doi.org/10.1038/s41598-026-63509-9
AB - Fiber bundles serve as optical transmission channels in partial-discharge (PD) detection systems, and thermal aging may alter the spectra acquired by external detectors. This study investigated the spectral-response evolution of a silica-based fiber bundle after thermal aging at 85 °C for 0, 24, 72, 168, and 336 h. A simulated-chamber platform using an integrating-sphere broadband source was established to acquire output spectra over 200–920 nm through segmented scanning and stitching. Three repeated measurements, dark-background subtraction, band-integrated output attenuation relative to the unaged state, normalized spectral profiles, and band contribution ratios were used to evaluate output-amplitude loss and spectral redistribution. All analyzed bands showed reduced measured output after aging, with strongly wavelength-dependent attenuation. At 336 h, the attenuation reached 95.6% in the 200–320 nm band and 93.5%–96.4% above 600 nm, compared with 72.6% in the 320–440 nm band. The contribution ratio of the 320–440 nm band increased from 26.3% to 52.7%, indicating comparatively better retention rather than improved transmission. Non-monotonic variations in several bands were not interpreted as material recovery and may reflect residual measurement and coupling variability. A preliminary needle–plate discharge test showed that the fiber bundle aged for 336 h could still transmit detectable optical signals, with a relatively strong response in the 320–440 nm region. These case-based results support the 320–440 nm region as a preferred remaining response window for the tested bundle and provide a basis for band selection, aging calibration, and transmission-margin design.
SN - 2045-2322
ER -