Xin Zhang, Haifeng Qiu, Jiaqi Lan, Qin Hu, He Zhang. Programmable gate array WM-TDLAS gas detection system design and application[J]. Opto-Electronic Engineering, 2024, 51(4): 240022-1
- Opto-Electronic Engineering
- Vol. 51, Issue 4, 240022-1 (2024)
Fig. 1. Quadrature phase lock-in principle block diagram
Fig. 2. Structure of the FPGA-based WM-TDLAS CO2 concentration detection system
Fig. 3. Block diagram of FPGA internal logic structure
Fig. 4. Detection system linearity experiment. (a) Amplitude extraction result of sinusoidal signal； (b) Linear fitting of extracted amplitude with actual value
Fig. 5. Anti-noise and Q-value experiment. (a) Harmonic extraction results with different signal-to-noise ratio； (b) Frequency amplitude response of DLIA
Fig. 6. Experimental platform for CO2 concentration detection
Fig. 7. Experimental results of carbon dioxide concentration detection. (a) Second harmonic waveforms; (b) Carbon dioxide concentration inversion curve
Fig. 8. Response time test of carbon dioxide detection system
Fig. 9. System stability experiment. (a) Carbon dioxide concentration fluctuates; (b) Allan variance
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Table 1. Volume comparison of lock-in amplifier (L: Length; W: Width; H: Height)
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