3D LASER PROFILOMETER Srisharan.

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Presentation transcript:

3D LASER PROFILOMETER Srisharan

The problem - Rock surface roughness imaging Source: UNAVCO and Muralha et al. (2014)

Project objective Create an inexpensive Arduino based laser scanner prototype for rock surface scanning in the Penn State Rock Mechanics lab

Working principle

Working principle

Working principle

Working principle

Working principle

Working principle

List of parts Sparkfun RedBoard and associated parts (eg. jumper cables, breadboard etc.) 10k potentiometers x 2 Line laser module Logitech webcam NEMA 17 stepper motor (200 steps/revolution or 1.8o resolution) TB6612 Stepper driver 100 uF capacitor Open source codes – Arduino 1.6.11 and Processing 3.2.1

Mechanical build

Circuitry

Proof of concept results

Challenges Environmental reds interacting with poor webcam contrasts Microstepping and pulse width modulation Lens curvature distortion

Future work Better resolution Mirostepping or using geared DC motor for non-jerky movements ‘Blackbox’ for the setup Using Python/Matlab for pointcloud instead of Processing

Takeaways Learnt some fundamentals of electrical circuitry and profilometry Learnt all about stepper motor drivers Preemptive vs reactive design considerations

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