Smartphone Turns into Pocket Spectrometer with a Simple Card

Purdue University researchers have devised a clever method to transform a regular smartphone into a high-precision spectrometer using a simple card with a special color reference chart. The technique uses an algorithm to analyze smartphone photos, extracting hidden spectral information with an accuracy of 1.6 nanometers. This breakthrough promises wide applications in defense, medicine, food safety, and more, making spectroscopy more affordable and accessible.