An efficient optimal designing method for a quantitative dispersive objective lens used in line-scanning chromatic confocal displacement sensor was discussed. A multi-configuration optical system consisted of paraxial and diffractive surfaces was proposed to realize the quantitative inverse linear dispersion distance in the wide FOV. The ideal optical model was used as the objective FOV for the design of dispersive lens in the inverse optical path. The multi-configuration with the axial quantitative dispersion was implicit in the single configuration optical path, so that the image plane becomes a unified reference plane for image quality evaluation. With this method, a dispersive objective lens of 580nm-780nm working wavelength band and 0.37 mm axial dispersion distance was designed, which the line-scanning width is 16 mm and the dispersive linearity is better than 0.9997.
Fixed focal length lens was used by the optical module of the traditional centering instrument. Under the principle of reflection measurement, the measurement range is limited when defocusing imaging the curvature center of the measured surface. In view of the above situation, a high resolution centering instrument was developed by switchable lenses. The measurement principle of center aberration of optical lenses was introduced and the calculation formulas of center aberration was given. The optical system of optical measurement module was designed and optimized. According to image quality evaluation results, it can be concluded that the optical system has high imaging quality and meets the requirements of high-precision using. The measurement range of the instrument is -∞ ~ -2 mm and 2 mm ~ +∞, the measurement resolution is better than 2 μm.
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