See our latest article discussing flat field correction in our HES spectrometer page.
Flat field correction is a well none technique applied to a variety of spectral measurement systems. Its influence is critical in our HES spectrometers due to the Fourier nature of the device.
Our latest azom article discusses this effect and how to correct in our instruments. This is key for Raman observations when trying to identifying trace species which could be masked by unwanted instrument effects.