Imagine pointing your smartphone at a salty snack you found at the back of your pantry and immediately knowing if its ingredients had turned rancid. Devices called spectrometers can detect dangerous chemicals based on a unique “fingerprint” of absorbed and emitted light. But these light-splitting instruments have long been both bulky and expensive, preventing their use outside the lab.
Until now. Engineers at the University of Wisconsin-Madison have developed a spectrometer that is so small and simple that it could integrate with the camera of a typical cell phone without sacrificing accuracy...
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