From NightHawkInLight.
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In this video we dive into compound parabolic concentrators (CPCs) and their incredible ability to focus light from multiple input angles onto a central target at once. This allows them to provide concentrated solar heat without active solar tracking, as well as increased absorbance from indirect sources (such as scattered light in cloudy weather). The method I use in this video is called a "string construction", which uses a string to simulate the reflection of light rays and sketch out idealized reflective curves.
Resources for further reading:
"A Review of the Compound Parabolic Concentrator (CPC) with a Tubular Absorber": https://www.researchgate.net/publication/339075001_A_Review_of_the_Compound_Parabolic_Concentrator_CPC_with_a_Tubular_Absorber
"Mathematical Modeling and Simulation of a Compound Parabolic Concentrators Collector with an Absorber Tube": https://www.mdpi.com/1996-1073/16/1/287#
Power From The Sun e-book, chapter 9: http://www.powerfromthesun.net/Book/chapter09/chapter09.html#9.2%20%20%20%20Compound%20Parabolic%20Concentrators%20(CPC)
Non-Imaging optics article discussing concentration limits of CPCs: https://ebrary.net/204001/engineering/nonimaging_optical_systems#google_vignette
Interactive model of an ordinary parabolic concentrator (great for emphasizing how much light is ordinarily lost at offset input angles): https://demonstrations.wolfram.com/ParabolicTroughSolarConcentrator
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