Long-distance measurement systems are widely used in vehicle ranging, obstacle avoidance, virtual reality and other fields. This paper proposes a fast and effective binocular stereo vision model method to improve the accuracy of long-distance measurement systems. We explored the experimental constraints of Zhang Zhengyou's calibration method, combined with the epi-polar correction method for image matching, improved ranging model based on binocular parallax, to attain accurate measurement results. We performed on obstacles within 100 meters to verify the effectiveness of the system. Using the method in this paper, the relative error within the overall ranging range is less than 10%,where the measurement error is less than 3% (distance: <60m) and less than 8% (distance: 60m~80m). The results show that ranging error is relatively smaller in the optimal calibrated sampling space. Our work has effectively improved the accuracy of longdistance measurement, which is expected to realize obstacle measurement at a low cost, improving the environmental perception ability based on passive ranging.
Phase transition can be used to alter the properties of a material without adding any additional atoms and are therefore of significant technological value. Most two-dimensional (2D) transition metal dichalcogenides (TMDs) exhibit more than one structural phase, leading to a number of remarkable physics and potential device applications beyond graphene. Here, we demonstrated a feasible route to trigger 2H-to-1T′ phase transition in few-layer molybdenum ditelluride (MoTe2) by laser irradiation. The Raman spectrum demonstrates a distinct change in few-layer MoTe2 after the laser irradiation (two prominent peaks at 125 cm-1 and 140 cm−1 ), which undoubtedly shows that a phase transition has occurred in few-layer MoTe2. Additionally, Raman mapping results reveals a high spatial resolution without any contamination by laser-irradiation-driven method. Last, we demonstrate that the metallic 1T′ phase of MoTe2 can be locally induced on semiconducting 2H phase nanosheets, thus decreasing contact resistances to 13.2 kΩ at zero gate bias. These results offer the opportunities for developing the next generation of high-performance nanoelectronics and optoelectronics based on MoTe2.
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