It’s not a perfect build, but the concept is intriguing: using polarized light and stress-induced birefringence to generate colors without resorting to RGB LEDs. The clock uses white LEDs to ...

and diagonally polarized light, and then measuring the corresponding output states with a detector. The goal is to measure how the birefringence of the sample alters the image that the detector ...

To highlight distinct characteristics, several types of polarized lighting can be employed. Plane polarized light (PPL) reveals the general hue, habit, and pleochroism of the crystal. Extinction angle ...