In-depth review charts the scientific understanding of rainbows and highlights the many practical applications of this fascinating interaction between light, liquid and gas.
There鈥檚 more to rainbows than meets the eye. Knowledge gained from studying these multicoloured arcs of scattered light can be incredibly useful in ways that may not immediately spring to mind. Rainbow effects can warn of chemical contamination in the atmosphere, help to develop more efficient combustion engines and possibly even provide insight into the mechanics of reinforced concrete.
Writing in , Alexander Hau脽mann of the Institute of Applied Physics at the Technical University of Dresden, Germany, has reviewed the latest developments in the field of rainbow research. takes a comprehensive look at natural rainbows and touches on the many practical applications of this fascinating interaction between light, liquid and gas.
Hau脽mann has been studying rainbows for more than 20 years. His interest began at school where he and his friends would log meteorological data for fun to keep tabs on changes in the weather. Today, weather watching has become more sophisticated with the introduction of techniques such as radar remote sensing, but observing rainbows remains important. As Hau脽mann points out, these patterns of scattered light can provide considerable clues to the size distribution and shape of raindrops falling during wet weather. If paired with radar data, this information could be used to quantify the amount of rainwater reaching the ground.
鈥淚f our analysis methods are precise enough, we can turn rainbows into optical remote sensing tools to study the physics of rain,鈥 he comments.
Hau脽mann鈥檚 review delves deep into the challenges of simulating rainbows as mathematical modeling is an important tool in furthering our understanding of this field. There are some key points that add to the puzzle.
鈥淩ain drops are not exactly spherical, but become deformed into slightly flattened 鈥榟amburger bun鈥 shapes due to air drag as they fall through the sky,鈥 he explained. 鈥淭his has a drastic influence on the appearance of rainbows and makes scattering calculations numerically very demanding.鈥
As well as focusing on the science, the article also provides tips for capturing rainbows on camera, which could help to win bragging rights on Instagram and other popular photo-sharing websites. 鈥淩ainbows are short-lived and special phenomena such as twinned bows are pretty rare, so it鈥檚 important to always have your camera to hand,鈥 recommends Hau脽mann.
鈥淭his can be a smartphone or, in my case, an SLR camera with a fisheye lens to capture the full width of a rainbow in a single frame.鈥