This unique sort of lenses is mostly utilized in determining applications if the factor is to determine without perspectival distortion in situation of differing things positions (throughout the picture area in X as well as Y instructions). The aperture angle of the optics is basically no levels within a particular set area, i.e. the optical road is definitely parallel in an excellent situation.
The outcome is that the image has no point of view mistake, every component of the graphic is shown in alongside the optical course: in contrast to endocentric optics, not just the center of the image, however likewise the image margin is examined up and down. Three-dimensional frameworks like sides and also bores are not checked out.
An additional particularity of telecentric lenses is the result that, also in axial instructions (Z-direction, in the direction of or away from the electronic camera), gauged ranges have the exact same graphic level within a specified variety. This indicates that also if the item is placed a small amount of more away or closer to the electronic camera, the determined parts do not differ in the graphic!
When are telecentric lenses utilized?
Whenever various dimensions on various things degrees (e.g. tires “bottom/ leading”) are to be impacted as well as compared with each various other.
Whenever the range in between things and also lens differs because the eating is not entirely accurate. Just telecentric optics assure equivalent picture levels as well as constant outcomes within the telemetry variety.
Whenever the position of the component highly differs in X or Y instructions as well as should however be assessed as properly regarding be duplicated, considering that telecentric lenses have really reduced geometric distortion results.
Whenever openings need to be checked or gauged. Clear forms without viewpoint mistakes as well as no sight of the likely side could just be given by telecentric optics.
The complying with uses as a whole: For all preciseness sizes it is advised to utilize telecentric determining lenses, preferably. They assure repeatability of the sizes also under not totally perfect problems.
Fundamentals of telemetry
Object-sided telemetry
In a lot of applications, the lenses are simply telecentric in the direction of the examination item as the focus is on the proper capture of the component. An object-sided telecentric optical course is created using a convergent lens in a diaphragm in the image-sided focal aircraft. A lens of this layout is usually made use of in the applications explained over: through object-sided telemetry, the point of view mistake could be prevented and also components could be gauged to scale also if the functioning range differs.
Image-sided telemetry
Fairly a number of lenses is created in such a means that the optical course is simply parallelized to the electronic camera sensing unit, i.e. the focal factor is in the infinite. An image-sided telecentric optical course is produced by ways of a convergent lens in a diaphragm in the object-sided focal aircraft. The bigger the sensing unit chip in percentage to the lens install, the a lot more usually this result could be noted.
Double-sided telemetry
If both approaches are incorporated, lenses with double-sided telemetry could be created. These lenses normally have a specifically high object-sided deepness of industry.
My name is Mable Hall, a professional freelance writer, like to introduce Lees Optical System Inc. . Whenever the range in between things and also lens differs because the eating is not entirely accurate. Just Telecentric Lens assure equivalent picture levels as well as constant outcomes within the telemetry variety.
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