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Bolometer

Bolometer

He bolometer It is an instrument used to collect and measure the radiation emitted by an object at all wavelengths.

In practice, the radiation to be measured is dropped into a "detector" causing a temperature rise that causes the electrical resistance of a circuit to vary, which, in turn, is connected to a reading instrument.

With such an apparatus it is possible to determine the so-called bolometric magnitude of a star, that is: its luminosity not only in visible light, but throughout all the radiations, visible or not, emitted by it.

It is used to study the amounts of energy radiated by a celestial source. The inventor of this instrument was the American astronomer Samuel P. Langley in 1878, with whom he studied the infrared radiation of the Sun.


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