Using Structured Illumination

Illumination is a censorious intrinsic of any machine vision system, and can often become the digression between a good imaging system and of a great one. The illumination location and wavelength requires to be solely considered for each appositeness not only does, but certain systems require structured illumination to aggrandize system performance.

Structured illumination takes advantage of straight-out impressions of light to detain the geometric contour and intensity of objects. A compelling 3D system can be cobbled up by illuminating objects with different impressions, such as dots, lines or grids, while reducing cost, parts, and multiplicity.

As a well-deliberated system aggrandizes measurement exactitude, it is substantial to know clearly that structured illumination isn’t solitary, and assured structures should be used to achieve certain measurements. For example, a dot grid impression may be good enough to scrutinize a few flecks on a gadget, but a line or a multiple line impression is needed to measure an gadget’s 3D contour.

The table given below shows some conventional structured illumination impressions and their prototypical appositeness.

Common Structured Illumination Patterns
Structured Illumination Method of Determination Purpose
 1-usi2-usi.jpg Triangulation Based Determining the dimensions of most objects while the object is scanned
 3-usi4-usi Shadow and Triangulation Based Determining the dimensions of refractive objects while the object is scanned
 5-usi6-usi Distortion Based Determining the depth information at multiple discrete points in a single exposure

Article is posted by Optics For Hire – lens design and manufacturing Consultant.

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