Bolometer is used to measure

Q. Bolometer is used to measure

1. Frequency
2. Temperature
3. Velocity
4. Wavelength

Answer: Temperature

A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance.

The bolometer is a device used for detecting and measuring the heat and radiation of Microwave energy or RF. It uses the temperature sensitive resistive element whose resistance changes with the temperature. The Thermistor and Barretter are examples of the commonly used resistive element.

The bolometer changes its resistance in response to thermal energy resultant from impinging radiant energy. The most common bolometric detector is the thermistor.

Bolometer was invented in 1878 by the American astronomer Samuel Pierpont Langley.