actinometer definition

  • noun:
    • any one of several radiometric instruments, particularly a pyrheliometer, made use of chiefly for meteorological measurements of terrestrial and solar power radiation.
    • A device used to gauge the heating energy of electromagnetic radiation, specifically compared to solar power radiation.
    • An instrument for measuring the direct home heating power for the sun's rays.
    • a guitar for calculating the actinic effectation of rays of light.
    • a musical instrument for calculating the power of radiation.
    • Chemical actinometers assess the energy of radiation by its chemical effects. Bunsen measured the actual quantity of hydrochloric acid created by sunshine from a mixture of hydrogen and chlorin; Marchand measured the actual quantity of carbonic-acid gas liberated from a remedy of perchlorid of metal and oxalic acid by the use of their antiphotypimeter. Photographic actinometers measure the power of this shade created on a sensitized plate by an exposure during one product period. Vapor actinometers gauge the level of fluid (water, alcohol, or ether) evaporated in a unit of time. Thermal actinometers measure the home heating effectation of radiation by many people different devices: often called pyrheliometers. De Saussure utilized the straightforward hot box; Sir John Herschel, a big thermometer-bulb filled up with a blue fluid; Pouillet, a measured level of water inclosed in a blackened cylinder, the heat regarding the water becoming given by a thermometer within it; Crova and Violle, a black-bulb thermometer within a large spherical inclosure held at uniform temperature; Arago, as customized by Davy, a couple of bright-and black-bulb thermometers each inclosed in a plane-glass spherical envelop where the air was fatigued: whenever exposed to the sunshine the black-bulb attains a higher temperature than the bright light bulb, additionally the distinction between the two is an index of quantity of heat which penetrates the glass envelop. The complete theory for this activity had been posted by Ferrel in 1885. Langley used a superb wire coated with lamp-black, the strength of a power present flowing through wire becoming shown by a delicate galvanometer and different using the heat of this cable. Hutchins, after Melloni and Tyndall, used a delicate thermo-electric junction as well as a galvanometer; Chwolson, a set of plates certainly one of which is exposed to the sunshine as the other is within the color, the real difference of temperature becoming shown by the power of a thermo-electric present; and Angström, inside the electrically compensated actinometer, two slim pieces alternatively subjected and shaded, the difference of temperature becoming assessed because of the power of this household current needed seriously to bring all of them both towards the same heat.
    • an instrument for measuring the strength of electromagnetic radiation (usually because of the photochemical impact)

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