How Do 3D Scanners Work?

Hermary scanners and many industrial 3D scanners work on the principle of laser triangulation. A laser beam is projected at a known angle onto a target to be measured; a camera at a known offset from the laser views the projected image.

Principles of Laser Triangulation

Understanding the laser scanning process can help you choose the right industrial 3D scanners for the job. The principles of triangulation gather data points in a reference plane established by a laser fan beam. All data points will be somewhere on this plane. If the laser strikes an object at A, this will be seen by the scanner’s image sensor at location A’. If the laser strikes an object at position B, it will be seen at B’. By examining where the laser is seen by the sensor, the scanner can calculate the distance to the object. Principles of Laser Triangulation  

A Typical 3D Scanner Setup

The setup below is a typical industrial setting. There are many 3D scanners that combine both the illumination source and the imaging sensor in one housing.

A typical laser triangulation setup

A typical laser triangulation setup

3D Scanners Using Geometric Measurement Techniques

This video shows how laser scanners work seamlessly to capture a target object’s dimensions by using the principle of triangulation. In modern manufacturing, laser triangulation is one of the most robust and reliable industrial scanning methods. Find out more about 3D and 2D machine vision at Hermary’s Guide to Unlocking Your Automation Potential. Learning about the history of 3D vision technologies also helps you decide which machine vision technology works best for your project. Read the article or watch the videos here.