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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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Weather Bureau for station use. You can help ExoDictionary by expanding, updating, or correcting it. The magnesium oxide has a high reflectivity for radiation in pyrheliomeeter solar wavelengths and is a good absorber and emitter in the longer wavelenghts, making for a low equilibrium temperature on exposure to solar radiation.

Canada Department of Transport Meteorological Branch.

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.

This definition article has been automatically generated. Retrieved from ” http: You can improve Exodictionary by cleaning up the page markup and verifying that the definition is correct and then removing this tag.


Eppley pyrheliometer

The overall response of the instrument to solar radiation is an e. A pyrhepiometer of thermocouples thermopile is used to measure the temperature difference between the rings.

Interwiki Lunarpedia Marspedia Exoplatz Scientifiction. This autostub has not yet had its initial copyediting proof and may contain significant formatting and even factual errors. The bulb contains dry air.

Eppley pyrheliometer | instrument |

Le contenu de ce site est sous copyleft The content of this site is under copyleft Der Inhalt dieser Website steht unter Copyleft. Eppley Pyrheliometer Serial No. The Eppley pyrheliometer consists of a thermopile mounted under receivers inside a clear glass spherical bulb about 3 inches in diameter.

The derived value of the constant for the instrument is 6. Personal tools Log in. 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. Eppley is still making radiation measuring equipment, although eppley no longer look like this one: Canada Department of Transport Eppey Branch Eppley is still making radiation measuring equipment, although they no longer look like this one: This instrument has been adopted by the U.


One ring is coated with magnesium oxide; to the underside of this the electrically insulated cold junctions are attached in close thermal contact.

You can improve Exodictionary by removing inappropriate categories and then removing this tag. The receivers are concentric flat metal rings exposed in pyrheliometr common plane; the rings are thermally insulated from each other and from the mounting.

Radiation is allowed to fall on two concentric silver rings, the outer covered with magnesium oxide and the inner covered with lampblack. The thermocouples are platinum-rhodium 90 – 10 percent and gold palladium 60 – 40 percent and the thermopile comprises several thermocouples.

Attachments are provided so that measurements of direct and diffuse solar radiation may be obtained. Info as printed on the plate: Pyrheliomteer autostub has not yet had its initial categorization proof and may be categorized incorrectly. The other ring is coated with lampblack; the hot junctions are similarly attached to its undersurface.