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Vol. 190, Issue 7, July 2015, pp. 86-91

 

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A Simple Method for Determining Thermal Expansion Coefficient of Solid Materials with a Computer-aided Electromagnetic Dilatometer Measuring System
 

1 Z. EZZOUINE and 2 A. NAKHELI

1 Spectrometry Laboratory of Materials and Archaeomaterials (LASMAR), Faculty of Science, Moulay Ismail University, BP 11201 Zitoune, Meknes, Morocco
2 Electrical Engineering Departments, High School of Technology, ESTM, Moulay Ismail University, Meknes, Morocco
1 Tel.: +212650844764

E-mail: ezzouine.zakaryae@gmail.com

 

Received: 23 June 2015 /Accepted: 27 July 2015 /Published: 31 July 2015

Digital Sensors and Sensor Sysstems

 

Abstract: In this study, we present a newly designed electromagnetic dilatometer with micrometer accuracy for the measurement of the coefficient of thermal expansion of a solid in the 30 C 96 C temperature range .The device has a graphical user interface to view real time data measurement. Iron and copper were subjected to temperature change in the thermal expansion experiment causing them to expand linearly. The voltage delivered in the electromagnetic dilatometer system, which includes the information about linear expansion and temperature change were transferred to a computer via a data acquisition card, presented by a program created in the LabVIEW environment, and the amount of linear expansion was detected in real time. The minimal change in length of the sample that can be resolved is 5m, which yields the sensitivity comprised between 10-4 m and 10-5 m. In order to calibrate the electromagnetic dilatometer, thermal expansion coefficients of copper and Iron have been measured. By this technique, the thermal expansion coefficient can be determined with an acceptable accuracy. The present results appear also to agree well with those reported previously in the literature.

 

Keywords: Coefficient of thermal expansion (CTE), Low temperature, Electromagnetic dilatometer, Measurement, Accuracy, Characterization of materials, LabVIEW.

 

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