Abstract
A differential infrared photometer has been developed for monitoring the CO2 concentration in the atmosphere. The working region of the spectrum of the device is 2300-2550 cm^−1. The attainable sensitivity with respect to the gas concentration is Delta N/N=10^−4, and this allows the device to be used for noncontact investigation of plant growth in a closed volume, with the possibility of recording the increment of dry vegetable mass every 2-5 min. © 2005 Optical Society of America
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