yes, we can measure with the help of sensors. that time u have to measure also vapor pressure, water use efficiency etc. u can also use fluorometric measurement.
Photosynthesis System is easy to use and measure. The LCi- SD Photosynthetic system is instantly calculates and displays a complete set of the most widely utilised parameters for plant gas exchange determination.
CO2 Assimilation Rate, A (displayed in µmol mol -1)