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Choosing the Optical Measurement System That’s Right for You
Optical measurement refers to noncontact measurement using numerous light sources. It often requires at least one lens, a light source and a detector. It differs from other forms of inspection in that instead of utilizing a tactile measurement method like a contact probe, it makes use of either some extent of reference (e.g. a crosshair) or a pc to calculate edge detection. Two of its greatest benefits are its capability to measure features too small or fragile to measure by touch, and the truth that it is faster in comparison to different forms of measurement.
The medical, plastics, aerospace and automotive industries are where optical measurement has, and will continue to have, significant impact. However, in reality, this form of noncontact detection applies to applications throughout most verticals and sectors. Adopters of modern optical measurement devices are looking for easy-to-use technology that helps the acquisition of more accurate data in less time. Consequently, there’s a rising demand for in-line measurement and faster processing of acquired images as well as image stitching capability and bigger fields of view. There’s also a rising demand for progressive components like liquid lenses. However when deciding which—if any—optical measurement gadgets are right for you, all factors must be considered.
Profile Projectors/Optical Comparators
You possibly can think of this optical measuring system as a high-accuracy overhead projector much like what schools used within the 1970s, ‘80s and ‘90s. It might probably accommodate goal lenses as much as 100x magnification, use either contour or surface illumination, and has either a microscope-fashion stage or metal stage with T-slots that may hold as much as one hundred lbs. The stage is married to high-accuracy linear scales, which provide positional feedback, and a crosshair is typically etched onscreen as a measurement reference point. Measurement throughput could be elevated by adding edge detection, usually within the form of an onscreen fiber optic detector.
Operation is pretty straightforward, with a consumer placing a workpiece on the stage with the necessary fixturing, then bringing the workpiece into focus by adjusting the Z-axis position. As soon as there’s a targeted image on screen, the person moves the stage so the onscreen reference reticle is aligned with the function of interest. The user then can zero the scales on either the X- or Y-axis and move the stage to the following position on the feature. The scale readout will determine the distance traveled with elevated measurement repeatability made possible with the usage of edge detection software. Final data is stored and analyzed by an optional 2D processor.
Advantages: The design of the objective lens, coupled with a screen size that can measure 14 inches or larger, means profile projectors typically have a bigger subject of view. Having been a well-recognized staple for decades, they're one of the easiest measurement devices to use. Unlike a measuring microscope, profile projectors are inclined to inflict a low level of eye strain. And, general, they tend to be the least costly option while remaining one of the fastest.
Disadvantages: Profile projectors/optical comparators have a decrease optical resolution in comparison to measuring microscopes as well as a lack of digital processing capability and low throughput. Lighting options are additionally limited, sometimes only together with contour illumination.
Measuring Microscopes
It’s necessary to level out that measuring microscopes are totally different from traditional microscopes. Unlike a traditional microscope, in a measuring microscope the stage is connected to linear scales that provide positional feedback, and a reticle is either built into the eyepiece itself or positioned within the light path as a reference level for measurement. In addition, a measuring microscope comprises both in-line illumination for applications that require reflected light and transmitted illumination that allows for contour or profile measurements.
In terms of operation, measuring microscopes operate in a similar method to profile projectors. A workpiece is placed on the stage, and an image of the characteristic of interest is then introduced into focus by adjusting the coarse and fine focus knob. Once a transparent image is viewable, the person aligns the constructed-in reticle and then moves the stage to the subsequent fringe of the feature. The resulting scale readout shows the distance traveled. As with profile projectors, edge detection software can be added to achieve larger accuracy and repeatability towards figuring out the exact edge of a part.
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