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Rules for reducing the sensitivity of fringe projection autofocus to air temperature changes
Rules for reducing the sensitivity of fringe projection autofocus to air temperature changes
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机译:降低条纹投影自动对焦对气温变化的敏感性的规则
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摘要
Fringe projection autofocus systems are provided with variable pitch diffraction gratings or multiple diffraction gratings so that a reference beam and a measurement beam propagate along a common path. Alternatively, an input beam can be directed to a diffraction grating so that the selected diffraction orders propagate along a common path. In some examples, distinct spectral bands are used for reference and measurement beams.
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