Working principle of radiation pyrometers - Basic Mechanical Engineering

Q.  The radiation pyrometers work on the principle of ______
- Published on 02 Sep 15

a. Newton's law
b. Stefan Boltzmann's law
c. Zeroth law
d. None of the above

ANSWER: Stefan Boltzmann's law

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  • Sravanthi    -Posted on 12 Nov 15
    Radiation pyrometer: In this method, temperature is measured without having any contact with the process. Radiation pyrometers work on the principle of Stefan Boltzmann's law.

    - According to this law, everybody emits electromagnetic heat radiation and the total radiation emitted by a black body is given as:

    q = σε T4

    here, ε = emissivity, σ = Stefan Boltzmann's constant, T = Temperature (Kelvin)

    - They are used to measure high temperatures of gases and vapors.

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