Jingsong Wei

Research of underwater target detection using a Slit Streak Tube Imaging Lidar

Slit Streak Tube Imaging Lidar (STIL) is a promising imaging system as its high frame rate and good image quality. As its important applications, the depth under the water to detect a underwater target near the coast is less than 20m. It can effectively indemnify the safety of ships. We use a Slit Streak Tube Imaging Lidar, including a laser whose wavelength is 532nm and the energy of one pulse is 20mJ. Through the outfield experiment on the sea, we discussed the optical properties of the target surface and distinguished two targets with the distance more than 10cm in one image. Also we get the imaging of the target which is 6m deep in the sea. We calculated the relationship between lidar detectable range and laser power in different attenuation. It will provide the basis for the future experiments.

Experiments research on ocean surface wave detecting using Streak Tube Imaging Lidar

Synthetic Aperture Radar (SAR) can acquire the ocean wave spectrum in the wide-range area, and it can recognize the complicated space structure of the ocean wave. However, because the wavelength of SAR is long, its space resolution is not enough to analyze the micro-scale wave of the ocean surface. In the paper, Streak Tube Imaging Lidar (STIL) is presented firstly to collect the 4-D image (3-D range image + 1-D intensity image) of the ocean surface wave, which has high space resolution and range accuracy. Through analyzing the 4-D image, the variance of height and coarseness of the small-scale wave can be computed. Therefore, the micro-changes of wave are obtained. The experiments were performed in Yellow Sea, China. The results state that STIL can collect the 4-D images of the ocean wave with high accuracy, which can be used to analyze the micro-scale wave.