Rapid thermal sensors with high resolution based on an adaptive dual-comb system

We report a high-resolution rapid thermal sensing based on adaptive dual comb spectroscopy interrogated with a phase-shifted fiber Bragg grating (PFBG). In comparison with traditional dual-comb systems, adaptive dual-comb spectroscopy is extremely simplified by removing the requirement of strict pha...

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Bibliographic Details
Published in:Frontiers of information technology & electronic engineering 2019-05, Vol.20 (5), p.674-684
Main Authors: Guo, Yi-zheng, Yan, Ming, Hao, Qiang, Yang, Kang-wen, Shen, Xu-ling, Zeng, He-ping
Format: Article
Language:English
Subjects:
Adaptive control
Adaptive systems
Bragg gratings
Communications Engineering
Computer Hardware
Computer Science
Computer Systems Organization and Communication Networks
Control theory
Electrical Engineering
Electronics and Microelectronics
Fast Fourier transformations
Feedback loops
Fiber lasers
Fourier transforms
High resolution
Instrumentation
Light sources
Networks
Spectral resolution
Spectroscopy
Spectrum analysis
Thermal measurement
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Summary:We report a high-resolution rapid thermal sensing based on adaptive dual comb spectroscopy interrogated with a phase-shifted fiber Bragg grating (PFBG). In comparison with traditional dual-comb systems, adaptive dual-comb spectroscopy is extremely simplified by removing the requirement of strict phase-locking feedback loops from the dual-comb configuration. Instead, two free-running fiber lasers are adopted as the light sources. Because of good compensation of fast instabilities with adaptive techniques, the optical response of the PFBG is precisely characterized through a fast Fourier transform of the interferograms in the time domain. Single-shot acquisition can be accomplished rapidly within tens of milliseconds at a spectral resolution of 0.1 pm, corresponding to a thermal measurement resolution of 0.01 °C. The optical spectral bandwidth of the measurement also exceeds 14 nm, which indicates a large dynamic temperature range. It shows great potential for thermal sensing in practical outdoor applications with a loose self-control scheme in the adaptive dual-comb system.
ISSN:2095-9184
2095-9230
DOI:10.1631/FITEE.1800347