Instruments have been designed and assembled for the summation of areas of precipitation on a weather radar map. One technique uses the output from a system scanning the map to deflect the trace on the cathoderay tube of an oscilloscope in discrete steps depending on the intensity of the precipitation. This trace is photographed. Since the brightness of the trace is constant, exposure is a function of scan-time. Because scan-time is proportional to area scanned, the density on film resulting from this exposure is a function of area. Densitometry then yields these areas. A more convenient technique makes use of the fact that scan-time is proportional to the number of cycles of the a.c. output from the scanner, and areal summation is accomplished with an electronic counter. Examples of measurements are presented, and their meteorological value is discussed. [...]
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.116595 |
| Date | January 1964 |
| Creators | Nitka, Gerhard. |
| Contributors | Gunn, K. L. S. (Supervisor), Wein, M., Marshall, J. S. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science. (Department of Meteorology. ) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: NNNNNNNNN, Theses scanned by McGill Library. |
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