The Abbot silver-disk pyrheliometer. Subjects: Pyrheliometer. Note: At head of title: Hodgkins Fund. Publication Physical Description: 11 p. illus. 24 cm. Get this from a library! The Abbot silver-disk pyrheliometer (with one plate). [Loyal Blaine Aldrich; Smithsonian Institution. Hodgkins Fund.]. Subject: 14 SOLAR ENERGY; PYRHELIOMETERS; DESIGN; MEASURING INSTRUMENTS; TELESCOPES * — Solar Energy– Resources & Availability.
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Direct comparison of the precision Eppley and field instruments can be made to determine the calibration constant of the field instruments.
Pyrheliometer, Silver Disk | National Air and Space Museum
Please re-enter recipient e-mail address es. Open Access, Property Rights, and Harvesting Behavior March 17th, The natural growth of the forest stock provides part of the story in characterizing the evolution of [ Reviews of the accuracy of these instruments and intercomparisons of hem led to the conclusions that measurements made on SSI3 were 3.
A cross section of a recent model of the Eppley is shown in Figure 2. This is usually done by means of a shading ring, as shown in Figure 2. A pyranometer or pyrheiiometer produces a voltage from the thermopile detectors that is a function of the incident radiation. Similar Items Related Subjects: Their response to changing radiation pyrhelioometer is essentially instantaneous and is linear with radiation. Find a copy in the library Finding libraries that hold this item Please create a new list with a new silvr move some items to a new or dissk list; or delete some items.
You may have already requested this item. Smithsonian ptrheliometer collectionsv. Radiation data usually must be integrated over some period of time, such as an hour or a day. The detector assembly was placed in a nearly spherical glass bulb, which has a transmittance greater than 0.
Your request to send this item has been completed. The thermopile assembly is covered with two concentric glass hemispherical domes to protect it from weather and is rectangular — in configuration with the thermocouples aligned in a row which results in some sensitivity to the azimuth angle of the radiation. The Ll-COR instrument is fitted with an acrylic diffuser that substantially removes the dependence of response on the angle of incidence of the radiation.
See Stewart et ai. It is iccommended that shading be accomplished by means of a disc held I m from the pyranometer with the disc just large enough to shade the glass envelope.
It is difficult to generalize from the few data available, but it appears that thin clouds or haze can affect the angular distribution of rotation within the field of view of standard pyrheliomeiers. Allow this favorite library to be seen by others Keep this favorite library private.
The Abbot silver-disk pyrheliometer
Another class of pynmometers, originally designed by Robtlzsch, utilizes detectors that are bimetallic elements heated by solar radiation: There is evidence that the calibration of pyranometers changes if the instrument is inclined pyrhwliometer the horizontal.
Finding libraries pyryeliometer hold this item Please choose whether or not you want other users to be able to see on your profile that this library is a favorite of yours. Abbot silver-disk pyrheliometer with one plate. The design was modified by Abbot in to include the use of two thermally identical chambers, dividing the cooling water between them and beating one chamber electrically while the other is heated by solar radiation; when the instrument is adjusted so as to make the heat produced in the two chambers identical, the electrical power input is a measure of the solar energy absorbed.
Cancel Forgot your password? It is also possible, as described by Norristo calibrate pyranometers against a secondary standard pyranometer such as the Eppjey precision pyranometlr.
Everything about solar energy Solar energy, helio systems, solar panels, collectors, equipment for water heating and space heating using solar energy and everything about solar energy. Preview this item Preview this item. The story is a very sa pyrheeliometer U uses a spherical container of alcohol that absorbs solar radiation. You already recently rated this item.
The Abbot silver-disk pyrheliometer
The quantity of alcohol condensed is a measure Of integrated solar energy on the spherical receiver. When there is no difference in temperature, the electrical energy to the shaded strip must equal the pyrhelio,eter radiation absorbed by the exposed strip.
The Angstrom instrument serves, in principle, as an absolute or primary standard. Citations are based on reference standards.