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Portable Laser Photoacoustic Methane Sensor Based on FPGA

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Figure

Figure 1.Schematic configuration of the PA methane sensor
Figure 5. Schematic diagram of the FPGA based lock in amplifier.
Figure 7. Measured 1f spectra of 200 ppm CH4.
Figure 8.  PA signals to different concentrations. Error bars give the range of the corresponding PA signals

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