Wireless laser spectroscopic sensor node for atmospheric CO2 monitoring—laboratory and field test
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- Smith, C.J., So, S., Xia, L. et al. Appl. Phys. B (2013) 110: 241. doi:10.1007/s00340-012-5157-8
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We developed a low-power, portable, wireless laser spectroscopic sensor for atmospheric CO2 monitoring. The sensor is based on tunable diode laser absorption spectroscopy with a 2-μm wavelength VCSEL as a source and wavelength modulation technique for spectroscopic signal detection. The sensor allows measurement of CO2 concentration changes with a 1σ sensitivity of 0.14 ppmv Hz−1/2. This sensor was both laboratory and field tested under varying environmental conditions. It was used to measure a soil respiration rate of topsoil in the lab and of forest floors in the field. Measurement results are compared with those of commercial non-dispersive infrared sensors and very good agreement is found.