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View-limiting shrouds for insolation radiometers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dennison, E. W. Trentelman, G. F. |
| Copyright Year | 1985 |
| Description | Insolation radiometers (normal incidence pyrheliometers) are used to measure the solar radiation incident on solar concentrators for calibrating thermal power generation measurements. The measured insolation value is dependent on the atmospheric transparency, solar elevation angle, circumsolar radiation, and radiometer field of view. The radiant energy entering the thermal receiver is dependent on the same factors. The insolation value and the receiver input will be proportional if the concentrator and the radiometer have similar fields of view. This report describes one practical method for matching the field of view of a radiometer to that of a solar concentrator. The concentrator field of view can be calculated by optical ray tracing methods and the field of view of a radiometer with a simple shroud can be calculated by using geometric equations. The parameters for the shroud can be adjusted to provide an acceptable match between the respective fields of view. Concentrator fields of view have been calculated for a family of paraboloidal concentrators and receiver apertures. The corresponding shroud parameters have also been determined. |
| File Size | 11298947 |
| Page Count | 30 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850023163 |
| Archival Resource Key | ark:/13960/t8cg4kw6b |
| Language | English |
| Publisher Date | 1985-05-15 |
| Access Restriction | Open |
| Subject Keyword | Radiometers Shrouds Insolation Apertures Ray Tracing Solar Collectors Mathematical Models Solar Radiation Parabolic Reflectors Elevation Angle Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
