| dc.description.abstract | In this thesis, we used two methods to design optical components. Converting a high-collimation light source into a special structured light of a dot array through the optical element. To achieve the high precision of structured light technology and the characteristics of fast scanning. In this study, using 632 nm collimated light source for design. Planning to produce a 60*60cm structure dot pattern at a distance of 50 cm. The structure was designed as a 100*100 rectangular dot matrix with a distance of 0.6 mm between each point.
Design method is divided into two, the first design approach is to use an Iterative Fourier transform algorithm to calculate the phase diffraction optical element between the original light field and the final result. An iterative approximation convergence of about 300 is performed. Then quantizing the diffractive optical element. The design result is a diffraction efficiency of 77% and a signal-to-noise ratio of 27.8dB. The diffraction pattern matches the target pattern and has 100*100 points in the diffraction area.
The second way is to use a microlens array. When the collimated light source passes through the lens array, it will be focused by the corresponding lens. These spots produced at the focal plane conduct Interference and diffraction, and produce the dot array in the far field. The period of the microlens affects the density of the structured light, and the focal plane spot size affects the screen image size. The design result is that the target area energy accounts for 93% of the total, and the rest of the energy is lost to the surrounding unclear lattice.
This study established two methods to design optical components to generate structural light, which can be selected according to different needs. The design freedom of the diffractive optical element is high, and in addition to the rectangular lattice in this study, special woven structure light can also be designed. The microlens array is designed to be fast, without the need for complex Fourier operations, to quickly understand design requirements and is relatively easy to manufacture.
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