How to Make Something that Makes (almost) Anything | S21 | Review

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3D SCanning Review, worked with Quentin and Sandy

Joon worked on mechanical sensiong and active sensing part. Notes

3D Scanning Processes

• Laser Scanning
  Benefits - contactless tool and fast, use speed of light.
  • Line Laser - Triangulation
  • Time of Flight
  • Microscopy

• Emits continuous laser beam, sweeping of the beam over area
• Capture texture of captured point with extra camera while scanning
• Capture returning back signals and mesure time to calculate distance from the object to scanner
• Output : Pointcloud
• Applications : Terrestrial scanning, building inspection

Laser measurement technolgoy

Structured Light Scanning

Light Stage

Reflection Confocal Microscopy

• Confocal microscopy, confocal laser scanning microscopy(CLSM), or Laser Confocal Scanning Microscopy(LCSM)
• Applications: life science, semiconductor inspection and materials science.
• Laser source(RGB), Beam spliter, Pinholes(hole diameter?), Lens, Pinhole(size?), photo muliplier tube(extremely sensitive detectors of lights)
• XY: Rotates mirror, beam spliter to capture lights from specific XY location. Z: only allow lights comming from focal plane -> 3 motors?
• Introduction to Confocal Microscopy (3min)
• Software : rebuild muiltiple layered images into 3D object(how?)
• Avoid photobleaching by not using UV light
• Drawbacks: slow and low lisght efficiency (Spining disk confocal)

Photogrammetry

Computed Tomography(CT scanning)

Synthetic aperture

Simultaneous Localization And Mapping(SLAM)

Machines/Vender/Techonolgies
Intel® RealSense™ DepthCamera
Leica, Faro, Trimble, LiDAR(light detection and ranging) , David(HP), Artec,

Software
Smarphone apps: Trino, Qlone, Heges, Scandy Pro
Recap

DIY Projects
DIY Laser Scanning Microscope (LSM), DIY X-ray CT scanner controlled by an Arduino - scanned chicken

2 / 25 / 2021

I want to participate in reviewing 3D scanning and explore some questions that I had when dealing with 3D scanning and point cloud data.

some questions that I have :

• What different type of 3D scanning techniques and processing methods exist?
• How do the blinking lights help the scanning device to capture the shape of the objects?
• Why do David laser scanners need a background pattern board when Artec scanners don’t. why?
• Photogrammetry software like Autodesk Recap do not require each image’s captured position, but some, like the Trino smartphone app, require each image’s location. Why?
• How does the iPhone LiDAR camera sensor enable a smartphone to be a 3D scanner?
• How does software capture 3D coordinates of points and color at the same time?
• How does software sample points from point cloud and make mesh?