This new imaging system can read closed books
They say you shouldn't judge a book by its cover, but a new imaging system from MIT can see right through the cover and read the book while it's still closed.That's thanks primarily to terahertz radiation, the band of electromagnetic radiation between microwaves and infrared light, and the tiny gaps of air between the pages of any closed book.Terahertz radiation can distinguish between ink and blank paper in a way that X-rays can’t, and it also offers much better depth resolution than ultrasound does. The prototype new system developed by researchers from MIT and Georgia Tech uses a standard terahertz camera to emit ultrashort bursts of radiation and then measure how long it takes for that radiation to be reflected back. An algorithm then gauges the distance to each of the book's individual pages.To read this article in full or to leave a comment, please click here