May, 2018


www.us-tech.com What’s Next for Visual and Optical Inspection? Continued from previous page


Greenough microscopes. CMOs are also capable of greater zoom ratios, reaching 20:1 or more. As with simple magnifiers, in -


creased magnification reduces the working distance of stereo micro- scopes. Working distances of 3.2 to 3.5 in. (8 to 9 cm) are common for stereo microscopes with 1x objectives, and that distance will shrink with higher


ed for this purpose. In a traditional trinocular ster -


eo microscope, light from one eye- piece will be directed to the camera for imaging, thus resulting in only one usable eyepiece while imaging. Some stereo microscopes, however, allow continued use of both eye- pieces, even while imaging. These are often referred to as


“true trinocular” stereo microscopes, such as the System 373 from LUXO Microscopes by UNITRON.


A New Age of Inspection Besides taking pictures, digital


inspection systems are focused on making inspection easier, efficient and more repeatable. Along with a


Ash Technologies Omni fully digital inspection system.


magnification lenses. As with Green - ough stereos, auxiliary or reducing lenses (less than 1.0x magnification) will lower the overall magnification, increase the field of view, and increase the working distance. If manual work or the use of tools are required, work- ing distance and reducing lenses may be quite important to consider. With stereo microscopes, op tions


for lighting go beyond that which are typically used with magnifiers. Ring lights, which attach to the bottom of the stereo microscope body or objec- tive, are very common and provide even illumination of the sample. Traditional ring lights use fluorescent tubes as the light source, while newer ring lights have LED lights with vari- able intensity. For applications where more intense and/or directional illu- mination is required, “goose neck” lights may be used, and these may be powered by halogen or LED light sources, have variable intensity, and give the user the ability to adjust the angle of the light.


Improving Workflow After magnification, zoom capa-


bility, proper lighting and ESD coat- ing, the next step is to improve or enhance observation, documentation and comparison — essentially the workflow. Such capability is especial- ly valued in contract manufacturing, inspection and repair. In the past, film-based cameras were used for doc- umentation, but that was the extent of the benefit. With video and now digital cameras, inspection can be facilitated with observation of the sample on monitors. Images can be readily taken and saved for documen- tation purposes. Digital images can also be aligned side-by-side for com- parison, and enable measurement and annotation directly on the image. A digital camera may be


attached to a stereo microscope pro- vided the stereo already has a cam- era or trinocular port. All that is needed is a camera adapter. Dif - ferent trinocular ports have different dimensions, and cameras have differ- ent sized sensors, so ask the micro- scope manufacturer for guidance so select the correct adapter for both the camera and microscope. If the stereo microscope does not


have a trinocular port, an eyepiece camera is a good option. These are designed to replace an eyepiece, and fit right into the eye tube. The camera and eyepiece can be swapped as need-


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Highlights Ersa VERSAFLOW 4/55 Highlights VERSAFLEX


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built-in camera, these systems deliv- er a plethora of features and func- tions all designed to accelerate work- flow, increase reproducibility and improve product quality. These features include measure-


ment applications with automatic edge detection, which ensures highly reproducible and repeatable measure- ments from sample to sample. Other rapid inspection applications include graticules, where go/no-go on-screen templates can define tolerance limits for rapid qualitative analysis. This is particularly advantageous for routine inspection pro cesses where an effi- cient go/no-go verification check replaces traditional time-consuming measurement checks.


For inspection processes that


compare samples to a master refer- ence image, digital inspection appli- cations, such as side-by-side and overlay image comparisons, allow samples to be easily and rapidly visu- ally compared to a stored master image on-screen. Quality control is essential in


industry and inspection systems, and digital inspections systems should have calibration traceable to an industry standard, such as ISO 175025. Reproducibility of inspection is further strengthened by the ability to save and recall standardized light and camera settings, and by setting limits on user privileges for even Continued on next page


Page 79


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Kurtz Ersa, S.A. de C.V. | Mexico Ersa Asia Pacific | China Ersa Hong Kong | China Ersa Shanghai | China Kurtz Ersa | France Ersa GmbH | Headquarters | Germany


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