What are the two primary types of bolometers?

Bolometers are devices used for measuring the power of incident electromagnetic radiation, typically in the infrared range. The two primary types of bolometers are barretters and thermistors.

Barretters operate based on the principle that the resistance of a material changes with temperature. They are usually made from materials that exhibit significant resistance variation with temperature changes, allowing them to effectively measure the energy from radiation.

Thermistors, on the other hand, are temperature-sensitive resistors that change their resistance based on temperature variations as well. They are often used in bolometric applications for their high sensitivity and rapid response to changes in temperature caused by absorbed radiation.

Together, these two types provide a fundamental understanding of bolometer technology, distinguishing them as effective tools for measuring thermal radiation in various applications, including scientific research and astronomical observations.