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Dark field lighting, a critical concept in optical engineering and microscopy, is distinguished by its unique illumination technique contrasted with bright field lighting. Its primary application lies in enhancing the contrast of specimens or features that are difficult to observe under standard lighting conditions.

Dark field lighting is a powerful tool in microscopy and quality inspection, offering detailed visualization of objects that would otherwise be invisible or overlooked with traditional lighting techniques.

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It is commonly used in the manufacturing process because it is a non-contact test method. It is implemented at many stages through the manufacturing process ...

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The essence of dark field lighting lies in its ability to illuminate a specimen with light that would not enter the objective lens under normal conditions. Only the light scattered by the specimen is captured, creating a bright image of the object against a dark, almost black background.

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The critical aspect of dark field lighting is the angle at which light is directed onto the specimen. Unlike bright field illumination, where light is directed straight onto the specimen, dark field illumination involves lighting the specimen from the sides at very oblique angles, typically greater than the critical angle of light acceptance of the objective lens. This angle often falls in the range of 45 to 80 degrees relative to the optical axis.

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