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Defocused unicell photometer with aspheric zone
Defocused unicell photometer with aspheric zone
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机译:非球面散焦单池光度计
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摘要
A defocused unicell photometer of the type having a positive lens element is provided with at least one aspheric zone on a portion of the lens element surface to change the directional response characteristic of the photometer in a select manner without increasing the extreme field of view of the photometer.
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