Affiliation:
1. University of Chinese Academy of Sciences
2. National University of Defense Technology
3. The 27th Research Institute of China Electronics Technology Group Corporation
4. Northwestern Polytechnical University
5. Shanxi University
Abstract
Streak tube
imaging lidar (STIL) can
obtain 4-D images of a target, and its performance is mainly
determined by the streak tube sensor. To obtain a large field of view,
we developed a streak tube
with a photocathode length as large as 35.3 mm, which is larger than
the commonly used ST-HDR (30 mm). At the same time, the temporal
resolution and dynamic spatial resolution are 60 ps and 12 lp/mm,
which are very suitable to obtain accurate target coordinates for 4-D
imaging. In addition, the streak tube has a high detection sensitivity
of 46 mA/W at 500 nm and, hence, prospects in remote imaging. To test
the performance of the streak tube, an underwater STIL experiment was
conducted. Echo signal processing was performed by means of a bandpass
filter and a matched filter, and then the peak detection algorithm was
used to reconstruct the image. The results indicate that a spatial
resolution better than 9 mm is achieved in the limpid water with a
depth of 20 m, and a range accuracy of 1 cm is achieved in the turbid
water with a depth of 10 m. Such a performance suggests that the
large-field streak tube is of great potential for underwater target
imaging and other remote imaging applications.
Funder
National Natural Science Foundation of
China
Youth Innovation Promotion Association of
the Chinese Academy of Sciences
Rising Research Star of Shaanxi
Province
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering