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Consider the surfaces of machined parts that you see all around you. These surfaces come in a wide variety of surfaces, from shiny and smooth to rough and matte. These outer differences are because of the different surface roughness of each part.

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Lens Rotation by Thomas Tag. There are three major types of lenses used in lighthouse towers – fixed, flashing, and a combination of fixed and flashing.

"I have been using laser diodes from QPhotonics for several years in time-resolved luminescence experiments. These laser diodes are rugged and reliable, which allows me to use them in state-of-the-art research experiments as well as educational projects." Uwe Hommerich, Hampton University, Hampton , Virginia .

The axicon is primarily used in the field of beam shaping and in various laser applications. A particular use is also the generation of non-diffractive Bessel- ...

Differences in surface roughness obviously lead to visual differences, however, they also have an effect on a variety of other characteristics. Examples include: the amount of wear, the ability to form a seal when a part makes contact with another surface, and the thickness of the paint needed to coat a part. This is why it is necessary to quantify surface roughness, that is, the microscopic asperity of surfaces.

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A translation stage with a motor is a precision mechanical device used in motion control applications that allows for precise linear movement along single or ...

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There are countless methods that can be used to quantify microscopic asperity. Some examples include finding the level difference between the highest and lowest points within a 1 mm 0.04" square area or finding the difference between the average of 5 high points and the average of 5 low points on a straight line 2mm 0.08" in length. However, if standards are determined in this sort of arbitrary fashion, inconsistencies may occur.

Feb 13, 2015 — Magnifying glasses make objects appear larger because their convex lenses (convex means curved outward) refract or bend light rays, so that they ...

This reader and case combo is a great value, offering high quality for a low price. 3.0 Magnification; 1 Case; Scratch Resistant Lenses; Spring hinges provide ...

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Traditionally, aspheric lenses have been produced by complex grinding, CNC machining or diamond turning, but with advances in glass molding technology, ...

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"I have been using laser diodes from QPhotonics for several years in time-resolved luminescence experiments. These laser diodes are rugged and reliable, which allows me to use them in state-of-the-art research experiments as well as educational projects." Uwe Hommerich, Hampton University, Hampton , Virginia . "the modules are working perfectly!" Yoel Fink, MIT, Cambridge, Massachusetts.

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Oct 7, 2020 — In order to be exact in solving for focal length, you would need to know the aspect ratio of the sensor. If exact is not necessary the diagonal ...

Surface roughness is defined as the shorter frequency of real surfaces relative to the troughs. If you look at machined parts, you will notice that their surfaces embody a complex shape made of a series of peaks and troughs of varying heights, depths, and spacing. Surface roughness is greatly affected by the microscopic asperity of the surface of each part.

A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (recessed inward).

When a part from company A is assembled together with a part from company B to form a final product, these component parts must have the same surface roughness. If they don't, the ability to form a seal will be compromised. In this situatoin, it is a major problem if companies A and B manage surface roughness using different standards. The International Organization of Standardization (ISO) regulates standards in order to define surface roughness.