There are different types of radiometers, each designed for specific applications and wavelengths of radiation. Some common types include:

* Pyrometers: These are used to measure the temperature of an object by measuring its emitted infrared radiation. They are often used in industrial settings to monitor the temperature of furnaces, kilns, and other high-temperature processes.

* Bolometers: These are sensitive detectors that measure the total amount of radiation incident upon them. They are often used in astronomy and atmospheric science to measure the radiation from distant stars and planets.

* Infrared cameras: These cameras use an array of detectors to create images of the infrared radiation emitted by objects. They are used in a wide variety of applications, including medical imaging, night vision, and thermal imaging.

The specific type of radiometer used will depend on the application and the wavelength of the radiation being measured.