Tech Reports

A New Paradigm for Multisensor Metrology: Fun

Imagine having a complete toolbox in your garage – one of those big red rolling toolboxes with drawers and compartments everywhere. Every wrench and ratchet, screwdriver and socket is neatly organized and available to be used. Just the right tool for every task.

This toolbox is now the world of modern multisensor measurement. Need speed to measure thousands of small features on a surface? Digital video systems gather thousands of measurement points in fractions of a second. Need high density points to characterize a 3D surface? High speed laser sensors scan part surfaces down to submicrometer resolution. Have features that present access problems such as bores or slots? Touch probes, both single point and scanning, are available to probe and scan the most inaccessible features. Need to access features on all faces of a part or features at odd angles? Wrists and Rotary Tables manipulate parts to create the perfect part/sensor relationship.

Which System is Right for Your Measurement Needs?

Dimensional measuring systems are essential technology for any manufacturing operation seeking to improve their manufacturing processes. In today's technology-driven environment, choosing the right measurement technology can require a significant investment of time and resources. Before making the decision to purchase a particular system, it is important to consider all the factors that will affect your choice.

Accurate Metrology with TeleStar Zoom Lens

The TeleStar zoom lens was developed by Quality Vision International (QVI®) for precision, three-dimensional metrology. The design provides the benefits of a large zoom range with the superior optical performance of a fixed lens system. Other companies improperly claim to have telecentric zoom lenses when, in fact, the lenses are only telecentric over a small part of their magnification ranges. The TeleStar zoom lens provides the benefits of continuously selectable magnifications, the optical performance of fixed lens systems, and telecentricity throughout its entire 10:1 zoom range ensuring accurate metrology at any magnification required for measurement of three-dimensional parts.

Large Field of View Measurements

The use of video measuring microscopes and comparators is common in modern manufacturing due to their ability to obtain fast and accurate non-contact measurements. There are many factors to consider when  choosing a measurement system including whether to purchase a traditional video measuring microscope, a comparator, or a system that provides a large field of view. This Technical Report will explain specific optical characteristics to consider when choosing a system.

Minimum Feature Size

There are many factors that can affect the validity of your measurements when using metrology equipment. Factors such as focus, edge characteristics and illumination are all significant, but with large field of view systems like QVI SNAP, SNAP DM200 and SNAP DM350, using the right magnification for the size of the feature being measured is especially important. The following provides a set of best practice guidelines to determine the correct magnification for the feature size you are trying to measure using QVI large field of view systems.

Digital Camera

There are many more choices of video cameras and technologies available on the market, and with those many choices has come a bewildering amount of myth, legend and partial understanding about what makes a "good" metrology camera. The first thing to understand in discussion of camera technology today is that not all video cameras are suitable for measurement. In this Technical Report, we hope to answer many frequently asked questions about video metrology cameras.

Configurable Optics

It seems like almost every month there is another new, low-priced video measurement system on the market. Many of these systems are offered by manufacturers or OEM resellers who package off the shelf optical components with a camera, stage and software for a "one-size-fits-all" solution. While some of these systems use high quality optical components, very few match the performance of the QVI® StarLite™ and SprintMVP™ systems.

QVI's advantage over these newcomers is that our optical and illumination systems are designed as a system to suit the intended application’s feature sizes and types. In this Technical Report, we will look at the factors that make QVI optical systems work effectively on a wide range of applications.

Video Autofocus

Autofocus accuracy is one of the most frequently misunderstood topics in optical measurement – and for good reason: it’s one of the most complex. Since it is the image of the part, and not the part itself that is measured, good focus is essential for accurate results. In this paper, we will look at how video autofocus works, and what determines its accuracy.

Ready to Measure

With so many video measuring systems on the market and so many service providers offering "expert" calibration services these days, there is a good deal of misunderstanding about accuracy and the effects of calibration on system performance.

In this Technical Report we will explain accuracy specs and best practices for calibration, so you will know when calibration is needed and what to expect when the work has been done right.