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Cover glasses and mounting medium together constitute the de facto front lens of every microscope objective. Even though flat, and not curved as lenses are, their combined thickness and optical properties influence the quality of image formation by objectives and eyepieces. Those who coverslip are, in effect, completing the assembly of a microscope...
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This work presents a portable optical meter for noncontact thickness measurement. The device shines a focused laser light on a thin and transparent sample, resulting in an interference between light reflecting from the top and from the bottom surface, and the interfering pattern is recorded by a linear sensor array before data analysis with an Arduino microcontroller. The device produced accurate thickness values from glass cover slips and transparent plastic sheets within a fraction of a second per measurement. Additionally, the sample’s refractive index is not required a priori. Therefore, it has a high potential to be of use in real-time quality control in transparent thick-film coating and manufacturing.
