Engineering Science Fair Project
Detection of Automobile Metal Surface Defects Using Laser Light Reflection

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Project Information
Title: Detection of Automobile Metal Surface Defects Using Laser Light Reflection
Subject: Engineering
Subcategory: Laser Technology
Grade level: Middle School - Grades 7-9
Academic Level: Ordinary
Project Type: Engineering
Cost: Medium
Awards: Global Finalist
Affiliation: Google Science Fair
Year: 2016
Materials: 5 steel sheet metal pieces, green laser pointer, potentiometer, photo-diode, Arduino Micro-controller Board, 7-segment display
Concepts: Reflection of light, light scattering
Description: The objective of this project is to find out if a laser light reflection detects defects on a metal sheet surface? A laser light was shone on the surface of a metal sheet, its reflection was captured by a photo-diode and the amount of current the photo-diode produces was measured taking in account that defects such as dents, bumps, or scratches on the surface of the metal sheet cause the increase of the scattering of of the reflected light, thus decreasing the amount of the current the photo-diode produces.

Source: Wikipedia (All text is available under the terms of the Creative Commons Attribution-ShareAlike License)

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