3D line scan camera, also known as laser profiler, 3D line laser measuring instrument, basic principle: by projecting a line laser plane onto the surface of the object, the coordinates of the three-dimensional point at the intersection of the plane and the surface of the object to be measured are obtained, and the depth information of the object is solved. . Main components: line laser, lens, chip, processing board, interface board.
Main Principles: Triangulation
Among them, the principle of optical imaging: Sham imaging
Sham's Law Definition: When the extended planes of the subject plane, image plane, and lens plane intersect in a straight line, a comprehensive and clear image can be obtained.
"Sham's Law" was originally applied to photography. In order to ensure clear imaging from close-up to distant views, the focal plane is tilted. It can be understood that "Sham's imaging" is to expand the "depth of field" of photography.
When the "Sham lens" is used in the field of machine vision - a 3D line scan camera, the definition of "depth of field" refers to the field of view in the FOV-Y direction of the optical object plane (the depth direction in the 3D line scan camera). But in the field of machine vision - 3D area scan cameras, the definition of depth of field is still the definition in geometric optics.
The depth of field Z (Z-axis field of view) of the 3D camera is related to the lens angle α, the movement size, and the lens magnification. By selecting the appropriate lens angle α, the depth of field requirements of the 3D camera can be met; and it depends on the lens magnification χ and the lens clip. Angle α, calculate Sham angle β, the specific calculation method is as follows.
Sham angle estimation formula:
∠1, ∠1' calculation formula:
Depth of field calculation formula:
