How can you use structured light scanning for reverse engineering or quality control?

1 What is structured light scanning?

Structured light scanning is a technique that uses a projector and a camera to create a 3D model of an object. The projector emits a pattern of light, such as stripes or dots, onto the object's surface, while the camera captures the images of the distorted light. By analyzing the changes in the light pattern, a software can calculate the depth and shape of the object and generate a 3D point cloud. The point cloud can then be processed and converted into a mesh or a CAD model.

2 How does it compare to other 3D scanning methods?

Structured light scanning is different from other 3D scanning methods, such as laser scanning, photogrammetry, or contact scanning, in several ways. One of the main advantages of structured light scanning is that it can capture high-resolution and accurate data in a short time, without requiring any markers or stickers on the object. It can also scan objects with complex geometries, textures, and colors, as well as shiny or transparent surfaces. However, structured light scanning also has some limitations, such as being sensitive to ambient light, requiring a fixed setup and calibration, and having a limited scanning range and field of view.

3 What are the applications of structured light scanning?

Structured light scanning can be used for various purposes, such as reverse engineering, quality control, inspection, metrology, or digital preservation. For example, you can use structured light scanning to create a 3D model of an existing part or product, and then modify it or reproduce it using CAD software and 3D printing. You can also use structured light scanning to measure the dimensions, tolerances, defects, or deformations of an object, and compare it to a reference model or a standard. Additionally, you can use structured light scanning to document and preserve the shape and appearance of historical artifacts, cultural heritage, or artworks.

4 What are the types of structured light scanners?

Structured light scanners come in various types, depending on the light source, the pattern, the camera, and the software. White light scanners use LED or halogen to project a sequence of patterns onto an object and can capture different colors and textures; however, they may be affected by external light sources. Blue light scanners use blue LED light to project a single pattern and can scan objects with higher accuracy and speed, but they may struggle with dark or reflective surfaces. Infrared scanners use infrared light to project a pattern and can scan invisible objects; however, they may not capture the color or texture of the object.

5 How to choose a structured light scanner?

When selecting a structured light scanner, you should take into account several factors such as the size and shape of the object, the surface and material of the object, and the purpose and output of the scan. It’s important to choose a scanner that can cover the whole object with its field of view and scanning range, capture the details and features of the object with its resolution and accuracy, handle the reflectivity, transparency, or color of the object's surface, avoid any interference or noise from the light source, produce the type and format of 3D model needed, and integrate with your software and workflow.

6 How to use a structured light scanner?

In order to use a structured light scanner, the first step is to set up and calibrate the scanner. This involves placing the scanner and the object on a stable and flat surface, as well as adjusting the distance and angle between them. Additionally, you must calibrate the scanner using a reference object or a calibration board. Next, you must begin the scanning process using the software or the controller of the scanner. Depending on your needs, you may need to scan the object from multiple angles or positions. Lastly, you must use the software to clean, edit, and optimize the scan, and to convert it into a mesh or a CAD model. You may also use other software to modify, analyze, or print the scan.