Abstract
This sensor was plan to detect vibration with very small displacement.
By using a laser ray that has a nanometer wavelength,
we hoped that this sensor can detect a vibration with high sensitivity.
According to wave theory that was found by Young from his experiment,
"wave can create a bright and dark pattern that cause by interference effect"
With this pattern, we will detect a changing voltage when the ray detector through that area.
Keywords: LASER, phototransistor, interference, vibration
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