Non-line-of-sight imaging based on laser range-gated imaging technology

Non-line-of-sight imaging is a new kind of imaging mode recently proposed by forign countries, which can look around corners and beyond the line of sight. In this paper, the concept of non-line-of-sight imaging mode based on laser range-gated imaging technology was illustrated, some foreign typical experiments and experiment results of it were also presented. Then, the range-gated imaging set-up in the laboratory, employing 532 nm Nd:YAG pulsed laser and intensified charge coupled device (ICCD), was utilized to get non-line-of-sight images through the reflection of glass window and ceramic tile wall. Experiments were carried out with a distance of 50 m and 20 m respectively. Analysis of the resultant images shows that the feasibility of non-line-of-sight imaging is related to the reflection properties of the reflection media, that is, media with specular reflection to a certain threshold can be used in non-line-of-sight imaging. Finally, non-line-of-sight imaging technology will be a new promising optical imaging mode, showing a potential application in urban street fighting, public security reconnaissance, disaster relief, and so on.