Signal Processing and Output Devices:

The electrical signal from the transducer is suitably amplified or processed before it is sent to the recorder to provide an output. Within dispersive IR instruments, as discussed later, an optical null system is employed to achieve the equal intensities of the sample and reference beams. Instead in FT-IR instruments, the interferogram obtained in the time domain is mathematically processed through the computer to produce its Fourier transform that is the signal in frequency domain. This is then further processed to get the recorder output.

We are sure in which having read about different components of IR instruments and their importance; you are equipped to learn about the IR spectrometers. It would be worthwhile to make an assessment of the understanding.