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Photonics Buyers' GuideNYFORS CLEAVEMETER 3DThe CLEAVEMETER 3D is a non-contact interferometer designed for inspecting the end-faces of cleaved or polished optical fibers with cladding diameters of 125 µm to 1200 µm. It gives immediate and precise information on important end-face properties such as flatness, perpendicularity, hackles and dust. Based on the NYFORS CLEAVEMETER 3D design, in addition to producing sharp fringe patterns it also generates three-dimensional images of the cleaved fiber end. When used in this mode, the surface topography is reconstructed from the fringe pattern and presented graphically as a three-dimensional image of the fiber end. By rotating the image and adjusting the scale and contrast, the surface quality and cleave angle at different points can be analysed in close detail, allowing for a more comprehensive understanding and accurate interpretation of the data and the cleaving process.

While this capability is always important to cleave quality analysis, it can be even especially helpful when analysing cleaving of fibers with complicated structures such as polarization maintaining fibers, or micro-structured fibers. Extremely accurate measurements of both cleave angle and surface flatness over arbitrary diameters can be performed on the reconstructed end-face surface. These measurements are carried out automatically. This makes the system well suited not only for detailed cleave quality analysis in laboratory environments, but also for close production monitoring where software features such as optional pass/fail indication of cleave angle help ensure that consistent cleave quality is maintained over long periods of continuous cleaver operator. In addition to cleave angle measurements, the system can also be used to measure a number of other properties such as plane angles, fiber diameters and the distance between points. The software allows the user to view the pointwise slope across the whole fiber end-face, a very useful tool for spotting small scale irregularities and crack propagation behaviour.

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