The VIIRS Day/Night Band: A Flicker Meter in Space?
نویسندگان
چکیده
The VIIRS day/night band (DNB) high gain stage (HGS) pixel effective dwell time is in the range of 2–3 milliseconds (ms), which about one third flicker cycle present lighting powered by alternating current. Thus, if present, it induces random fluctuations nightly DNB radiances. This results increased variance temporal profiles. A survey characteristics conducted with high-speed camera data collected on a wide individual luminaires found that most pronounced high-intensity discharge (HID) lamps, such as high- and low-pressure sodium metal halides. Flicker muted, but detectable, incandescent luminaires. Modern light-emitting diodes (LEDs) fluorescent lights are often nearly flicker-free, thanks to high-quality voltage smoothing. footprints half square kilometer can contain vast numbers luminaires, some flicker, while others do not. If many flickering drawing from common AC supplier, be synchronized leave an imprint profile. In contrast, multiple power supplies will throw out synchronization, resulting cacophony less radiance fluctuation. examination profiles for locations before after conversion LED streetlight conversions shows reduction index dispersion, calculated dividing annual mean. There number variables contribute variations DNB, including view angle, cloud optical thickness, atmospheric variability, snow cover, lunar illuminance, compilation using pixels whose not perfectly aligned. It makes sense adjust these extraneous effects possible. However, none adjustments reduce instability introduced flicker. Because known affect organisms, humans, development methods detect rate strength space open up new areas research biologic impacts artificial lighting. Over time, there trend towards outdoor through replacement HID low-flicker sources. study indicates brightness steadiness analyzed
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ژورنال
عنوان ژورنال: Remote Sensing
سال: 2022
ISSN: ['2315-4632', '2315-4675']
DOI: https://doi.org/10.3390/rs14061316