Phys.org June 25, 2021
Light-in-flight sensing has emerged as a promising technique in image reconstruction applications at various wavelengths. A team of researchers in the US (NIST, industry, University of Colorado) has developed a microwave imaging system that uses an array of transmitters and a single receiver operating in continuous transmit-receive mode. Captures take a few microseconds, and the corresponding images cover a spatial range of tens of square meters with spatial resolution of 0.1 meter. The images are the result of a dot product between a reconstruction matrix and the captured signal with no prior knowledge of the scene. An engineered electromagnetic field mask is used to create unique random time patterns at every point in the scene and correlates it with the captured signal to determine the corresponding voxel value. They demonstrated through-wall real-time imaging, tracking, and observe second-order images from specular reflections…read more. Open Access TECHNICAL ARTICLE
Position evaluation based on time of flight. Credit: Nature Communications volume 12, Article number: 3981 (2021)