June 29, 2021

This method refers to the identification of the temperature of a surface with the colour of the radiation emitted. The optical pyrometer compares the brightness of the image produced by the temperature source with that of a reference temperature lamp. The optical pyrometer has an eyepiece at one end and an objective lens on the

These pyrometers absorb only infra red pyrometer rays and measure temperature. At some high temperature, a surface starts emitting I-R rays in addition to visible light energy. These I-R rays are used with a detector and electronic circuit to measure the temperature. Various types of photo electric transducers are used for I-R transducers. One among