German scientists discover new use of Wifi for 3D imaging

【Global Science and Technology Report】 According to the British "Daily Mail" recently reported that scientists at the Technical University of Munich, Germany developed holographic image processing technology, the use of WiFi signal microwave radiation to generate a region and the area of ​​people and things in 3D images. The WiFi signal is like a window to snoop the user's home. The researchers said that this technology can generate a scan of the building and track people in the room, but it can also help people search after an avalanche or earthquake. Dr. Friedenmann Reinhard and Philipp Holl, Ph.D. published in the scientific journal Physical Review Letters, claim that optical holograms require superb laser technology, and that the generation of holograms using microwave radiation from WiFi transmitters requires only a fixed antenna and one Removable antenna. Dr Friedemann Reinhard, director of Quantum Sensors Division at Walter Shott Institute at the Eminot Research Group at Munich University, said, "With this technology, we can generate 3D images of the space surrounding the WiFi transmitter, just like ours The eyes can see the microwave radiation." Generating images through microwave radiation requires large bandwidth, special-purpose transmitters. The small-bandwidth typical home WiFi transmitters in the 2.4GHz and 5GHz bands are enough for researchers to use holographic data processing technology. Even Bluetooth and cell phone signals will work. The wavelength of these devices corresponds to a spatial resolution of a few centimeters. Philipp Holl said, “People no longer use a mobile antenna to measure images point-to-point, but use more antennas to capture video-like image frequencies. Future WiFi frequencies may reach the 60 GHz IEEE 802.11 standard, which will make Resolution is accurate to millimeters." The idea of ​​treating the microwave hologram as an optical image makes it possible to combine the microwave image with the camera image. Additional information extracted from the microwave image can be embedded in the camera image of a smartphone for tracking radio tags connected to lost items. But scientists have just begun to develop this technology. Although researchers can foresee technologies used in industry and rescue, they also know that if this technology is improperly exploited, it will infringe on privacy and security. (Internship Compilation: Xue Jingxia Reviewer: Liu Yang)