As a new generation of optical surfaces, free-form surfaces have a non-rotating symmetric structure and complex characterization ability. With the rapid development of optical manufacturing technology and detection technology, it is gradually applied in optical design. But the free surface structure is complex, different optical faces have different surface type features, no good generality. Combining the characteristics of free-form surfaces, proposed the conversion algorithm between different faces and deduced the common surface conversion, presented the use scene and the optical system optimization method, and verified the optical system design examples, proposing new ideas for optical system design. The design results show that the design optimization using the surface conversion algorithm helps to improve the image mass and skip the local minima.
The minimum resolution is one of the most important characteristics of human vision, during the flight of the aircraft, the pilot uses the head-up display(HUD) to observe and distinguish the information of the external scenery. Analyzing the impact of different transmittance HUD combiner under different environment brightness on the external resolution has important instruction and application value for aviation safety. The experiment uses the UASF1951 target plate and the transmittance of HUD combiners under two different environmental brightness. Record the minimum resolution angle and the difference between the two conditions. The result shows that, under the same brightness, the lower the contrast, the weaker the human eye can recognize; the minimum resolvability of the human eye is affected by contrast: when the brightness is lower, the lower the brightness, the higher the minimum contrast requirement for human eye to recognize objects. When the brightness is higher, the minimum contrast requirement for human eye to recognize objects does not change much with brightness, and after the brightness is increased to a certain range, the minimum contrast required by the human eye to recognize the object is almost unchanged. It can be seen that the resolution of the human eye is simultaneously affected by environmental brightness and contrast, and the experimental results basically conform to the Adrian’s Visual Acuity Model.
Optical waveguide display technology is an important branch in the field of augmented reality display. Because optical waveguide has the exit pupil expansion function, it can greatly reduce the exit pupil size of relay optical system and realize light and miniaturization design, so it is widely used in head mounted display. In this paper, the imaging principle of optical waveguide optical system is analyzed, the internal light propagation law is studied, an optical waveguide configuration design based on two-dimensional expansion mode is proposed to realize two-dimensional expansion in both horizontal and vertical directions, and a miniaturized relay optical system is designed to reduce the size of the entrance pupil from 5mm × 3mm extended to 23mm × 20mm, the display system of large exit pupil is realized, and the continuity of exit pupil is verified by simulation calculation. This configuration can be used in the field of head mounted display system.
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