Question

What is the reason why we typically cannot use photon detectors for IR spectrometer?

Answer 1

using photon detectros in IR detection is possible but not favoured because photonic detectors are made up of PN junction diodes, and the photons can cause electron excitations in these materials which then have to be cooled down for optimal performance. The response time and sensitivity of photonic detectors can be much higher, but usually these have to be cooled to cut thermal noise. Whereas, in thermal detectros, the resistacne fothe sensor with incident radiation is measured