When detecting metal body steps, scratches, dust or foreign particles on transparent surfaces, and dust or foreign particles on mirror-like surfaces using standard light, reflections, and ghosting can occur, making observation difficult.
One method is dark field observation. (For more details, please refer to “What is dark field observation?”)
By setting the background to black and using low-angle LED light, a simple form of dark field observation can be achieved.
If there are steps or scratches on the metal, those areas will appear white under illumination.
Dust and foreign particles on transparent surfaces (lenses) will also appear white under illumination.
Dust on mirror-like surfaces (silicon wafers) will also appear white under illumination.
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Low-angle LED ring light GR56-N |
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Low-angle bar LED light (Customized product requested by the customer) |
