Sensor technology in devices

I am testing to make a colorsensor by my self to be used with projectors. I was wondering, do any of you guys know what type of sensors units like the eye-one, monaco, Spyder and the Pantone units contain? I’d really like to know so I can get some sort of Idea of what I can use. Maybe someone has a unit that don’t work and can open it, maybe there is som sort of type defenition on the actuall sensor component.

Does anybody know, so I know what kind of electronics I should be looking for?

Greetings from emi