Hi, I wanted to know that whether my following experiment is conceptually correct or not. I am making a project on spectrosopy. And I have created my files and chart and everything the only thing which is left is a working model. Now what i am trying to do is to find out the amount of CO2 in air. Suppose we take a sample of air and we pass radiation having the wavelengths ranging from 1 to 50 micrometers, through it. Now CO2 aborbs radiation ranging from 5 to 20 micrometers . Now behind this sample we would keep a photodiode array.Hence the incident radiation would create electricity. Now we would rehearse the same experiment again,with the absence of CO2 in the air. And this is what i dont know how to do. Now both the times the current produced by the photodidodes would be different.So now if we study the voltage and magnitude of the current for both the experiments which would certainly be different,can we have some way in order to find out that how much amout of radiation is aborbed by CO2 so that we can find the total amount of CO2 in the gas? I kow that i would certainly get wise answers and also suggetions which would help me do this experiment properly.