研究目的
Investigating the use of stimulated Raman scattering in gas-filled hollow-core photonic crystal fibers for distributed hydrogen sensing.
研究成果
The developed all-fiber, label-free distributed spectroscopic sensing technique based on stimulated Raman scattering in HC-PCFs offers high sensitivity, selectivity, large dynamic range, and long sensing distance. It represents a significant advancement over previous methods, with potential applications in environmental, safety, and industrial monitoring.
研究不足
The study demonstrates high sensitivity and selectivity but notes the potential for further enhancement by increasing pump power. The dynamic range and sensing distance are significant, but practical applications may require optimization for specific environments.
1：Experimental Design and Method Selection:
The study utilizes stimulated Raman scattering (SRS) in hollow-core photonic crystal fibers (HC-PCFs) for hydrogen sensing. The methodology involves the interaction between a pump laser beam and a probe beam within the HC-PCF to detect hydrogen concentration.
2：Sample Selection and Data Sources:
Hydrogen gas samples of varying concentrations were used, pressurized into segments of HC-PCF.
3：List of Experimental Equipment and Materials:
HC-1550-06 fiber from NKT Photonics, optical intensity modulator (IM), Erbium-doped fiber amplifier (EDFA), fiber Bragg grating (FBG), optical coupler (OC), polarization controller (PC), pump filter (PF), photodetector (PD), isolator (ISO).
4：Experimental Procedures and Operational Workflow:
The pump beam is modulated to generate an optical pulse, amplified, and launched into the HC-PCF. A CW probe beam is launched in the opposite direction. The SRG signal is recorded and averaged by an oscilloscope.
5：Data Analysis Methods:
The Stokes gain is analyzed to determine hydrogen concentration, with signal-to-noise ratio (SNR) and noise equivalent concentration (NEC) calculations.
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HC-1550-06 fiber
HC-1550-06
NKT Photonics
Sensing fiber for distributed hydrogen detection
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optical intensity modulator
IM
Modulates the pump beam to generate an optical pulse
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Erbium-doped fiber amplifier
EDFA
Amplifies the optical pulse
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fiber Bragg grating
FBG
Reflects the pump but filters out the amplified spontaneous emission of EDFA
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optical coupler
OC
Couples light into the HC-PCF
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polarization controller
PC
Controls the polarization of the light
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pump filter
PF
Filters out the residual pump beam
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photodetector
PD
Detects the SRG signal
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isolator
ISO
Prevents back reflections
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