Affiliation:
1. Anhui Polytechnic University
2. Chinese Academy of Sciences
3. Wuhan University
Abstract
Realizing the integrated acquisition and identification of the elevation information
and spectral information of the observation target is at the frontier
and a future trend of Earth observation technology. This study designs
and develops a set of airborne hyperspectral imaging lidar optical
receiving systems and investigates the detection of the infrared band
echo signal of the lidar system. A set of avalanche photodiode (APD)
detectors is independently designed to detect the weak echo signal
of 800–900 nm band. The actual radius of the
photosensitive surface of the APD detector is 0.25 mm. We
design and demonstrate the optical focusing system of the APD detector
in the laboratory and obtain that the image plane size of the optical
fiber end faces of the APD detector from channel 47 to channel 56 is
close to 0.3 mm. Results show that the optical focusing system
of the self-designed APD detector is reliable. On the basis of the
focal plane splitting technology of the fiber array, we couple the
echo signal of 800–900 nm band to the corresponding APD
detector through the fiber array and conduct a series of test
experiments for the APD detector. Field test results of the
ground-based platform show that the APD detectors in all channels can
complete the remote sensing measurement of 500 m. The
development of this APD detector solves the problem of hyperspectral
imaging under weak light signals and realizes the accurate detection
of ground targets in the infrared band by airborne hyperspectral
imaging lidar.
Funder
Director Fund of Advanced Laser Technology Laboratory of Anhui Province
Chinese Academy of Sciences President’s International Fellowship Initiative
National Natural Science Foundation of China
National Key Research and Development Program of China
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering