研究目的
To develop a high-speed and portable QEPAS based sensor with enhanced sensitivity by tracking and correcting the quartz-resonant frequency drift in real time.
研究成果
The proposed high-speed and portable QEPAS based sensor with FPGA implementation of the function generator and lock-in module enhances sensitivity by a factor of 2 to 3 through real-time tracking and correction of resonance frequency drift related to pressure variations. Future work includes moving the temperature controller to the FPGA.
研究不足
The study currently focuses on pressure variations and their effect on quartz resonance frequency. The temperature controller is planned to be moved to the FPGA in future work, indicating a current limitation in temperature control integration.
1：Experimental Design and Method Selection:
The study involves the development of a QEPAS based sensor platform using FPGAs for high-speed measurements and sensitivity enhancement. The waveform generator and the lock-in amplifier are implemented inside the FPGAs to reduce system size and increase execution speed.
2：Sample Selection and Data Sources:
The study uses CH4 gas to demonstrate the drift of the quartz resonance frequency as a function of gas pressure.
3：List of Experimental Equipment and Materials:
The main equipment includes FPGAs for implementing the waveform generator and lock-in amplifier, and a quartz fork for QEPAS measurements.
4：Experimental Procedures and Operational Workflow:
The resonance frequency of the quartz fork is measured and tracked as a function of CH4 pressure. The calibration curve of the quartz resonant frequency is established and embedded on FPGA for real-time tracking and correction.
5：Data Analysis Methods:
The drift and fitting of the quartz resonance frequency as a function of CH4 pressure are analyzed. The calibration curve is used to correct any resonance drift during measurements.
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