Imaging AccuracyLenses
Wed, 08/08/2007 - 22:00
In last month’s column, I talked about the accuracy funnel, which shows that in a measurement system where the sensor or the part is moved in one or more axes, the greater the distance, the larger the potential inaccuracies in the measured distance… Funneling AccuracyThe smaller the travel, the more accurate the measurement
Wed, 07/11/2007 - 22:00
In last month’s column, I talked about the format of accuracy specifications for video measuring machines. The following is a typical format for a single axis accuracy specification: Ex = ±[k + (multiplier * L)/1000] μm And this is an example of an… Accuracy, Repeatability, PerformanceAccuracy specifications for video measuring machines
Wed, 06/13/2007 - 22:00
Accuracy, repeatability, performance—knowing how to interpret specifications for measuring devices and systems is important. This month I’ll talk about accuracy specifications for video measuring machines, which I described last month. The… Dimensional Measurement with Vision
Wed, 05/09/2007 - 22:00
The past few columns about inspection and measurement have led to discussion of different systems for measuring based on images. One type of measurement done via image analysis is dimensional, or coordinate, measurement. The systems are… Automatic=Accurate, Right?Well, maybe
Wed, 04/11/2007 - 22:00
A metrologist wants to know that any variations in measurements are the result of variations of the parts being measured, not variations in the measuring devices or their users. Subjective interpretation of inspection or measurement devices is a… Measurement and InspectionIs there a difference?
Wed, 03/14/2007 - 22:00
Last month, I talked about vision vs. video and brought up the possibility of confusion between inspection and measurement. Some think that inspection is qualitative and measurement is quantitative. I can’t say I’ll put the matter to… Visual, Vision, Video InspectionWhat’s the difference?
Wed, 02/14/2007 - 22:00
Using the eye is visual. The use of magnified imaging by eye or with a camera is a common part of manufacturing. Some of that use is for inspection. Some is for measurement. Some is online. Some is offline. There are vision-inspection… Measuring New Year’s ResolutionsYou can’t know you got there without measuring.
Wed, 01/10/2007 - 22:00
It’s New Year’s resolution time. Many of the things we resolve to do in the New Year are measurable—lose weight, run farther or faster, quit smoking, do more of some things and less of other things. All can be measured. But how do you… Compensating for TemperatureWhat’s it all mean?
Wed, 12/13/2006 - 22:00
Continuing last month’s topic of temperature effects on measurements, what about temperature compensation? Some measuring systems claim increased accuracy with the usually optional temperature compensation. What’s that? What’s it supposed to do? And… Quantifying for QualityMetrology, A to Z
Wed, 11/08/2006 - 22:00
This is the first “Measurement Matters,” a column that will show how much measurement matters in achieving and maintaining quality, especially in manufacturing. I will cover topics such as types of measurements and measurement devices, how…
