Question

What can be done to make the color comparison better for an optical pyrometer?

(a) Better accuracy of telescope

(b) Using electrical circuit for control box

(c) Inclusion of absorbing screen

(d) Using red filter

This question was posed to me by my school teacher while I was bunking the class.

My doubt is from Pyrometry and the Types of Pyrometers in division Tools of the Metallurgist of Engineering Material & Metallurgy

Answer 1

Right answer is (d) Using red filter

For explanation I would say: An optical pyrometer measures temperature by comparing brightness or the emitted light. To make this comparison easy, a red filter is used. This red filter limits the visible radiation only to the wavelength of red radiation.