研究目的
To report the design, development and field deployment of a quantum cascade laser-based tunable diode laser spectroscopy (TDLS) system for high-sensitivity measurement of atmospheric CO and CO2.
研究成果
The measurements demonstrate the capability of TDLS for accurate long-term monitoring of air pollutants and GHGs in India, with the WMS technique being calibration-free, which is important for field measurements.
研究不足
The Peltier cooler in the QCL package cannot handle the heat load on the laser during the day, limiting measurements to night time.
1：Experimental Design and Method Selection:
The system uses two distributed-feedback quantum cascade lasers (DFB-QCLs) for CO and CO2 detection, employing wavelength modulation spectroscopy (WMS) for high sensitivity.
2：Sample Selection and Data Sources:
Atmospheric measurements were made at Gandhinagar from 19-25 July
3：List of Experimental Equipment and Materials:
20 DFB-QCLs (HHL-521 for CO and HHL-513 for CO2), laser diode controllers (Thorlabs, ITC4002QCL), photodetectors (Vigo, PVI-4TE-6), a digital LIA (Zurich Instruments, HF2LI), and a digital storage oscilloscope (Tektronix, TDS3054C).
4：Experimental Procedures and Operational Workflow:
The system was deployed outdoors, with measurements made at night to avoid heat load on the laser.
5：Data Analysis Methods:
The mole fraction and pressure of CO and CO2 were extracted from least-squares fit of simulated WMS lineshapes to experimental signals.
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Digital Storage Oscilloscope
TDS3054C
Tektronix
Digitizing the signals from the LIA
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DFB-QCL
HHL-521
Alpes Lasers
Interrogating the rotational-vibrational transitions of CO at 4594.99 nm
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DFB-QCL
HHL-513
Alpes Lasers
Interrogating the rotational-vibrational transitions of CO2 at 4319.30 nm
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Laser Diode Controller
ITC4002QCL
Thorlabs
Driving the DFB-QCLs
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Photodetector
PVI-4TE-6
Vigo
Detecting the light from the DFB-QCLs after traversing the free-space path length
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Digital LIA
HF2LI
Zurich Instruments
Demodulating the 1f and 2f WMS signals
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