measurement instrument and technology are needed for measuring the important parameters of contact lenses. A new method is proposed to use optical projection and self-scanning photodiode array to measure the curvature
optical center thickness and diameter of contact lenses. A new instrument based on the method has been successfully designed for measuring contact lenses. Its precision is superior to ?0.1 mm in lenses curvature
?0.01 mm in optical center thickness
and ?0.1 mm in diameter. The measuring principal
special construction
signal sampling process of this new instrument and the design of the single-chip microcomputer hardware and software system are discussed in detail.
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references
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