These are the metrics that are most important for transverse scanning in sawmills. We will be using them to compare the two types of lasers available.
For many years now, accuracy, reliability, and depth resolution have been achievable with both multi-dot and line lasers. The laser types begin to separate when we look at speed, occlusion angle, and points per scan.
Speed refers to the scan speed of the laser scanner: how many scans are captured per second or how close the rows of data are to each other.
Occlusion angle is a measurement of the separation between the laser and the camera. A high occlusion angle can create instances where board features can block (or occlude) the cameras ability to see other areas of the board.
And finally, points per scan means the number of 3D points we can gather along the board with a single scan: how close the columns of data are to each other.
We’ll now begin to look in-depth at both types of lasers.