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Different areas of the surface are imaged as the spacecraft flies forward. A push broom scanner can gather more light than a whisk broom scanner because it looks at a particular area for a longer time, like a long exposure on a camera. One drawback of push broom sensors is the varying sensitivity of the individual detectors.
A whisk broom or spotlight sensor, also known as an across-track scanner, is a technology for obtaining satellite images with optical cameras. [1] It is used for passive remote sensing from space. In a whisk broom sensor, a mirror scans across the satellite ’s path ( ground track ), reflecting light into a single detector which collects data ...
There are push broom scanners and the related whisk broom scanners (spatial scanning), which read images over time, band sequential scanners (spectral scanning), which acquire images of an area at different wavelengths, and snapshot hyperspectral imagers, which uses a staring array to generate an image in an instant.
Cob brooms are used to clean webs from high areas and were historically made with round brushes. [19] Whisk brooms use bristles that are shorter and finer than other brooms. [18] Rubber brooms were created in the early 20th century to prevent the debris raised when sweeping with straw brooms. [20]
(The Center Square) – A bipartisan group of U.S. senators has reintroduced legislation to push the Food and Drug Administration to adopt modern alternatives to animal testing. The bill would ...
Whisk broom or spotlight sensors have the effect of stopping the scan, and focusing the detector on one part of the swath, typically capturing greater detail in that area. This is also called a close look scanner, comparable to a telephoto lens on a camera.