An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance.
A device which measures the energy of all of the radiation which falls on it, regardless of the wavelength or visibility of the radiation.
An infrared detector which absorbs the IR radiation and warms slightly; the electrical resistance across the bolometer changes as a function of temperature, which can be measured and calibrated.
an instrument that measures heat radiation; extremely sensitive
a device that changes resistance when IR energy strikes its surface, causing a baseline bias across the device to conduct more or less, in proportion to the amount of energy it receives
a device which measures increases in temperature due to the radiant energy it receives at all wavelengths
an electrical instrument, invented by Langley , which is sensitive to radiant heat, and who used it to make discoveries in the ultra red rays of the spectrum
A microwave or far-infrared detector that operates by measuring the change in temperature of an absorber when illuminated by EM radiation.
a sensitive resistance thermometer often used in IR instruments. Usually cooled with liquid nitrogen or helium to reduce dark currents.
A kind of detector mainly used to measure infrared radiation. A bolometer works by heating up as it absorbs the radiation that reaches it. The increase in temperature is measured by an internal electrical resistance, and is a measure of the amount of radiation absorbed.
an infrared detector that functions by measuring the heating effect of the incident radiation
Thermal detector which changes its electrical resistance as a function of the radiant energy striking it.
Instrument for measuring the intensity of radiant energy. Its principle is based on the variation of electrical resistance, with the incoming radiation, of one or both the metallic strips which the instrument comprises.
A bolometer is an instrument that measures the total amount of radiant energy (not just visible light) received from a star or other celestial object.
An temperature measuring instrument using a strip thermistor to achieve higher sensitivity than a simple thermistor. Unlike thermistors which are used for contact temperature measurements, bolometers have been used to measure radiation levels.
(Also called actinic balance.) An instrument that measures the intensity of radiant energy by employing a thermally sensitive electrical resistor; a type of actinometer. In meteorological applications, two identical, blackened, thermally sensitive electrical resistors are used in a Wheatstone bridge circuit. Radiation is allowed to fall on one of the elements, causing a change in its resistance. The change is a measure of the intensity of the radiation.
A bolometer is a device for measuring incident electromagnetic radiation. It was invented in 1878 by the American astronomer Samuel Pierpont Langley.