Pyroelectric transducer:

Transducers are the specialized materials that respond to the IR radiation in terms of a temperature change or development of current or voltage. Deuterated triglycine sulfate (DTGS) is an example of pyroelectric transducer and is used in FT-IR spectrometers.

The essential components of a FT-IR spectrometer are

• Source
• Interferometer
• Sample assembly
• Transducer or detector
• Signal processing and output device

The function of the interferometer is to modulate the signal.