| 释义 |
extended source
extended source[ik′stend·əd ′sȯrs] (astronomy) A radio source that has a large angular extent and is strongest at longer wavelengths, as distinguished from a compact source. (optics) A source of radiation that can be resolved by the eye or a specified instrument into a geometrical image. extended source
source, extended A source consisting of many point sources separated laterally and such that it has a very low degree of coherence. Thus, an extended source has a given size and subtends a given angle. See coherent sources; beam of light; diffuse light. |