An open path CO2 analyser is described for measuring CO2 fluxes over crop canopies by the eddy correlation technique. The analyser measures CO2 concentration within 0.3 ppm by volume with a time constant of 0.075 s. The CO2 concentration is determined from a comparison of the absorption of infrared radiation in the 3.7 mu m and 4.3 mu m bands over a 1.5 m path.
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Brach et al. (1981) studied this question.
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