Tests were made of the effect of several variables on the performance of the Eppley pyrheliometer. The tests showed: (1) How the output increased with. Find out information about Eppley pyrheliometer. A pyrheliometer of the thermoelectric type; radiation is allowed to fall on two concentric silver rings, the outer. An Eppley Normal Incident Pyrheliometer (NIP) is calibrated against an Eppley Hickey-Frieden Absolute. Cavity Radiometer under a variety of environmental.
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Info as printed on the plate: A system of thermocouples thermopile is used to measure the temperature difference between the rings. Radiation is allowed to fall on two concentric silver rings, the outer covered with magnesium oxide and the inner covered with lampblack. This definition article has been automatically generated.
Weather Bureau for station use. Le contenu de ce site est sous copyleft The content of this site is under copyleft Der Inhalt dieser Website steht unter Copyleft. The similarity of the receivers with regard to absorption of long wave radiation tends to minimize the effect of any long wave radiation as from the glass cover which may fall on the receivers.
Retrieved from ” http: Eppley Pyrheliometer Serial No. This instrument has been adopted by the U. Interwiki Lunarpedia Marspedia Exoplatz Scientifiction.
Eppley pyrheliometer | Article about Eppley pyrheliometer by The Free Dictionary
The derived value of the constant for the instrument is 6. You can help ExoDictionary by expanding, updating, or correcting it.
You can improve Exodictionary by cleaning up the page markup and verifying that the definition is correct and then removing this tag. The magnesium oxide has a high reflectivity for radiation in the solar wavelengths and is a pyrhelioometer absorber and emitter in the longer wavelenghts, making for a low equilibrium temperature on exposure to solar radiation.
The other ring is coated with lampblack; the hot junctions are similarly attached to its undersurface.
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The overall response of the instrument to solar radiation is an e. The receivers are concentric flat metal rings exposed in a common plane; the rings are thermally insulated from each other epply from the mounting. The Eppley pyrheliometer consists of a thermopile mounted under pyrjeliometer inside a clear glass spherical bulb about 3 inches in diameter. Eppley is still making radiation measuring equipment, although they no longer look like this one: Attachments are provided so that measurements of direct and diffuse solar radiation may be obtained.
The bulb contains dry air. Lampblack has good absorption in both wavelength intervals, and due to its greater absorption of the solar wavelengths its equilibrium temperature on exposure to solar radiation is higher than that of the magnesium oxide.
Canada Department of Transport Meteorological Branch. One ring is coated with magnesium oxide; to the underside of this the electrically insulated cold junctions are attached in close thermal contact. The thermocouples are platinum-rhodium 90 – 10 percent and gold palladium 60 – 40 percent and the thermopile comprises several thermocouples.
Canada Department of Transport Meteorological Branch Eppley is still making radiation measuring equipment, although they no longer look like this one: Personal tools Log in.