17 July 2015 Measurement of thermal expansion coefficients of materials based on Nd:YVO4 laser feedback systems
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Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95240L (2015); doi: 10.1117/12.2186482
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore
Abstract
The noncooperative and high sensitivity optical displacement measurement technology is very relevant to the study and the determination of high-precision thermal expansion coefficients (TECs) of materials. This paper describes a measurement technology based on Nd:YVO4 laser feedback systems, which can realize fully non- contact measurement of many kinds of materials with surface reflectivity greater than 10-5. A muffle furnace is designed with two coaxial holes opened on the opposite furnace walls. This length determination technique is based on the frequency-shifted optical feedback effects and the heterodyne phase measurement technique. For validation, the samples are determined in the temperature range 298 to 748K, confirming high sensitivity non- contact measurement of the materials and demonstrating TEC-measurement capabilities with uncertainties in the range of 10-7 or less.
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Yingchun Ding, Fasong Zheng, Jing Lin, Yidong Tan, "Measurement of thermal expansion coefficients of materials based on Nd:YVO4 laser feedback systems", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95240L (17 July 2015); doi: 10.1117/12.2186482; http://dx.doi.org/10.1117/12.2186482
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KEYWORDS
Temperature metrology

Optical testing

Laser systems engineering

Modulation

Heterodyning

Neodymium lasers

Reflectivity

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