Shuaihua CUI, Lei YU, Junqing ZHU, Tian YAO, Bangshu XIONG, Qiaofeng OU. Measurement method of helicopter blade root torsion angle based on perspective transformation[J]. Journal of Applied Optics, 2023, 44(2): 412
- Journal of Applied Optics
- Vol. 44, Issue 2, 412 (2023)
Fig. 1. Schematic diagram of composition of measuring system
Fig. 2. Schematic diagram of calculating torsion angle of P1 azimuth
Fig. 3. Schematic diagram of perspective distortion
Fig. 4. Schematic diagram of solving perspective transformation matrix
Fig. 5. Schematic diagram of target image correction
Fig. 6. Measurement results of perimeter of rectangular frame
Fig. 7. Schematic diagram of ground simulation experiment
Fig. 8. Images before and after correction of P7 azimuth
Fig. 9. Target image of P1 azimuth
Fig. 10. Measurement results of fan blade torsion angle in P1~P7 azimuth
Fig. 11. Measurement results of physical distance of marker circle center
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Table 1. Experimental results of theoretical torsion of 15°(°)
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Table 2. Experimental results of theoretical torsion of 30°(°)
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