New technology helps read words from more than 1km away

Công nghệ mới giúp đọc chữ từ cách xa hơn 1km - Ảnh 1. — With the new invention, researchers were able to accurately read characters about 3mm apart - Photo: LIU ET AL., PHYSICAL REVIEW LETTERS, 2025

According to Science Alert , this device emits eight infrared laser beams, aimed at a specific point at a distance. Two telescopes are then used to record the intensity of the reflected light.

Through careful calibration of the eight laser beams illuminating the target, images can be reconstructed by comparing the differences between the data obtained from the two telescopes.

“Through outdoor experiments, we successfully imaged targets at a distance of 1.36km, achieving a resolution about 14 times higher than the diffraction limit of a single telescope,” the team wrote in the published paper.

Long-range cameras like this have a wide range of applications, from space telescopes to remote sensors. With the new invention, researchers were able to read characters as small as 3mm in size. This is a big step forward, showing the potential of the technology.

In the past, this method was mainly used to detect very bright distant stars, or closer objects illuminated by nearby light sources. Now, the technology is used in a variety of ways on Earth, especially in advanced physics experiments.

According to the team, there is still room for further improvement, especially in the way the infrared laser is controlled. It is also possible to integrate artificial intelligence algorithms into the system, to interpret text and shapes more accurately.

"The new work is a significant technical advance in imaging distant objects that do not emit light themselves," optics researcher Shaurya Aarav from Sorbonne University in France, who was not involved in the research, told Physics Magazine.

The research is published in the journal Physical Review Letters .

DAWN

Source: https://tuoitre.vn/tia-laser-giup-doc-chu-tren-giay-tu-cach-xa-hon-1km-2025052615404307.htm