An instrument used to measure radiant energy, usually in the infrared and microwave regions of the electromagnetic spectrum. It comprises a lens or stop system which focuses the test radiation onto a thermoconductive device (usually a thermistor), which is set in a Wheatstone bridge circuit with another nonilluminated reference thermistor. Sensitive bolometers are used in conjunction with spectroscopes to measure the intensities of spectral lines.
Related categories• HEAT AND THERMODYNAMICS
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