研究目的
To improve the resolved field of view (RFOV) in line scan cameras by optimizing optical contrast along the line of interest using a single doubly symmetric mirror and Zernike coefficients.
研究成果
The LF method successfully doubles the resolved field of view (RFOV) in line scan cameras or increases illumination by 2.5 times while maintaining RFOV, by optimizing a single doubly symmetric mirror. This approach offers a simpler and more manufacturable alternative to previous methods like foveated scanning and SMS-based designs, with potential applications in high-end and high-volume production systems.
研究不足
The design is limited to a proof-of-concept single mirror system; practical implementations may face challenges in manufacturing and aligning free-form surfaces. The optimization may not find the absolute global optimum due to nonlinearity. Tolerance analysis indicates sensitivity to Zernike coefficient variations, requiring high-precision fabrication.
1：Experimental Design and Method Selection:
The study employs the Linear Fovea (LF) method, which involves designing a single surface reflective telescope with a doubly symmetric mirror. The optimization process uses Zernike coefficients to describe the mirror surface, aiming to maximize RFOV. Ray tracing and MTF analysis are performed using ZEMAX software.
2：Sample Selection and Data Sources:
A proof-of-concept single surface reflective (SSR) telescope is used as the test bench. The sensor is assumed to have 10,000 pixels, each 10 μm x 10 μm, covering a length of 10 cm. Simulations use a high-resolution file from the USAF-1951 target.
3：List of Experimental Equipment and Materials:
The setup includes a single mirror telescope with an effective focal length of 1 m and f-number of 8. The mirror is described by Zernike fringe sag coefficients. ZEMAX software is used for design and analysis.
4：The mirror is described by Zernike fringe sag coefficients. ZEMAX software is used for design and analysis.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The design involves optimizing variables such as sensor-to-mirror distance and Zernike coefficients (e.g., Z2^2 and Z4^0) to maximize RFOV. MTF is calculated at the Nyquist frequency (50 cycles/mm), and simulations are conducted for on-axis and off-axis imaging.
5：Data Analysis Methods:
Performance is evaluated using modulation transfer function (MTF) analysis, resolved frequency maps, and image simulations. The Rayleigh criterion (MTF > 0.09) is used to define resolvability. Optimization algorithms in ZEMAX, including damped least squares and global search, are employed.
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