Correct option is B
A pyrometer is a specialized instrument used for measuring high temperatures, especially in furnaces, kilns, and industrial processes where direct contact measurement is not feasible. It works on the principle of radiation or optical sensing to determine temperature without touching the object.
Types of Pyrometers:
1. Optical Pyrometer – Measures temperature based on the brightness of a heated object.
2. Radiation Pyrometer – Detects infrared radiation emitted by hot surfaces.
3. Infrared Pyrometer (Non-contact thermometer) – Uses infrared sensors to measure temperature from a distance.
Pyrometers are essential in industries like metallurgy, glass manufacturing, and ceramics, where temperatures exceed 1000°C, beyond the range of standard thermometers.
