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Optical Encoders Help Measure Material Fatigue


Continued from previous page


vertebral disc prostheses, various biomaterials, athletic footwear, and elastomeric components. These RESOLUTE absolute


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optical encoders are well suited for mechanical measurement applica- tions, such as material fatigue test- ing, due to their reliability, resolu- tion, accuracy, and ease of installa- tion. The encoders’ data-capture functions must be accurate and reli- able, since measurements on materi- al samples in many cases cannot be repeated. Failures such as miscount- ing are unacceptable because they lead to erroneous readings and potentially incorrect conclusions about a material sample. The RES- OLUTE absolute optical encoders provide high tolerance to the dirt, scratches, and grease that can cause other encoders to generate miscount- ing errors, and an independent posi- tion-checking algorithm also ensures that any potential problem is flagged long before it reaches the controller.


Very High Resolution Needed Strain measurements on stiff


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material samples require position encoders with extremely high resolu- tion. The low jitter of the RES- OLUTE encoders (less than 10 nm RMS) improves displacement sensi- tivity and allows more information to be gleaned from a material sample under test. The behavior of dynamic mate-


rials-testing machines must be pre- cisely controlled with either strain


feedback from an encoder or stress feedback from a load cell. The stan- dards body American Society for Testing and Materials (ASTM) toler- ates deviations within 2 percent of the maximum applied load before a test becomes invalid. The high accu- racy and excellent dynamic perform- ance of the RESOLUTE optical encoders permit more detailed analy- sis of samples at the point of failure, contributing to the accuracy of drawn conclusions. The RESOLUTE components


are also single-track absolute optical encoders, allowing for wider installa- tion tolerances than traditional multi-track encoders. An integral setup light-emitting diode (LED) in the RESOLUTE encoders further simplifies installation during initial installation and during servicing. Instron’s design engineers were


aware of the limitations of LVDT encoder technology and hoped to find the suitable encoder solution to meet the requirements of their new mate- rial measurement systems. The RES- OLUTE encoders supported by Renishaw’s BiSS protocol provide the advanced capabilities of the Electro - Puls measurement systems. In addi- tion, Renishaw’s close working rela- tionship with Instron continues to drive future product innovation and development across both companies. Contact: Instron, 825 University


Ave., Norwood, MA 02062-2643 % 800-564-8378 or 800-877-6674 E-mail: web@instron.com Web: www.instron.com r


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