New technology that can read pages of a closed book

The system uses terahertz radiation, the band of electromagnetic radiation between microwaves and infrared light, which has several advantages over other types of waves that can penetrate surfaces, such as X-rays or sound waves.

Terahertz frequency profiles can distinguish between ink and blank paper, in a way that X-rays can not, and has much better depth resolution than ultrasound.

The system exploits the fact that between the pages of a book tiny air pockets are trapped about 20 micrometres deep.

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