研究目的
To develop a realistic all-fiber CO2 sensor based on absorbance in the 2 μm region for industrial applications, covering a wide concentration range with high sensitivity.
研究成果
The all-fiber CO2 sensor is mechanically stable, requires no recalibration, and is suitable for long-term industrial use. It achieves a working range of 2% to 100% CO2 concentration with a mean error of 0.4% and response time of 10 minutes. Future improvements could involve using fibers with lower mode interference to extend the detection range to lower concentrations.
研究不足
The presence of high-order modes limits the minimum detectable CO2 level to 2%, introduces measurement uncertainties, and affects accuracy. Response time is 10 minutes, which may be slow for some applications. Longer HC-PCF could reduce detection limit but increase response time further.
1：Experimental Design and Method Selection:
The sensor uses a dual-path correlation scheme with a tunable laser and HC-PCF cavity for light/gas interaction, based on CO2 absorbance spectroscopy.
2：Sample Selection and Data Sources:
CO2 gas samples at various concentrations (0% to 100%) were used, with simulations from the Hitran database.
3：List of Experimental Equipment and Materials:
HC-PCF (NKT HC 2000), tunable Cr2+:ZnS/Se laser (IPG Photonics), single-mode fiber (SMF 28), multi-mode fiber, fiber coupler, National Instruments NI 6009 DAC board, PC with Labview software, and a pumping system for gas flow.
4：Experimental Procedures and Operational Workflow:
Light from the laser is split into reference and sensing arms; the sensing arm passes through the HC-PCF cavity where gas absorption occurs; transmitted light is detected and normalized; the system scans wavelengths and processes data to determine CO2 concentration.
5：Data Analysis Methods:
Data is processed using Labview to calculate normalized transmission valley and apply Beer-Lambert law equations for concentration determination.
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