To enhance imaging efficiency, a scannerless laser active imaging system by directly ranging was explored on the basis of an Avalanche Photo Diode (APD) array and a splitting beam illuminating method. A pulse laser was selected to be a light source, and the distant information of a target was obtained by measuring the time-of-flight of laser. A Dammann grating was used for illuminating by splitting beams to improve the usage efficiency of laser energy. Furthermore, a transceiving optical system with a common aperture was adapted to ensure the geometrical alignment between laser foot-prints and pixels of the APD array. Different from the constant threshold discriminator used in reference APD, a time discrimination method in combination of the constant threshold discriminator and the constant fraction discriminator was used to process the echo signal from APD array and to adapt the parametric variation of optical path. Moreover, dedicated time-detecting chip TDC-GP22 was used for each channel to test the interval between starting and stopping pulses, and to obtain the timing resolution of 45 ps.At last, an imaging experiment was conducted by choosing two corner reflectors respectively located in the distance of 19 m and 31 m as cooperative targets and the distant images were given. Result shows that the average distances of the two targets are 19.28 m and 31.54 m, respectively, and the distant errors are 0.28 m and 0.54 m. It concludes that the optical system and design method proposed are feasibility. 2016, Science Press. All right reserved.
Xuan, L.,B. He,L. F. Hu,et al. Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics[J]. Chinese Physics B,2016,25(9).
APA
Xuan, L..,B. He.,L. F. Hu.,D. Y. Li.,H. Y. Xu.,...&Q. Q. Mu and X. H. Lu.(2016).Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics.Chinese Physics B,25(9).
MLA
Xuan, L.,et al."Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics".Chinese Physics B 25.9(2016).
; B. He; L. F. Hu; D. Y. Li; H. Y. Xu; X. Y. Zhang; S. X. Wang; Y. K. Wang; C. L. Yang; Z. L. Cao; Q. Q. Mu and X. H. Lu
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