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Instrumentation for Highly Accurate Index Measurement of Liquid

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Conference

2011 ASEE Annual Conference & Exposition

Location

Vancouver, BC

Publication Date

June 26, 2011

Start Date

June 26, 2011

End Date

June 29, 2011

ISSN

2153-5965

Conference Session

Effective Projects and Experiments in Instrumentation and Control

Tagged Division

Instrumentation

Page Count

9

Page Numbers

22.892.1 - 22.892.9

Permanent URL

https://peer.asee.org/18198

Download Count

12

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Paper Authors

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Chao-Chia Cheng National Central University

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Lee king-lien Department of Electro-Optic Engineering, National Taipei University of Technology, Taipei, Taiwan 542, R.O.C.

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Ph.D., Associate professor, Department of Electro-Optic Engineering, National Taipei University of Technology

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Chih-Hsiung Ku National Dong Hwa University

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Abstract

  Instrumentation for Highly Accurate Index Measurement of LiquidAbstract:The index of refraction is one important optical property of materials. It also providesinformation to analyze liquids or mixed solutions, such as chemicals, foodstuffs,drinks, and pharmaceuticals. In this work, we introduced a creative indexmeasurement method which aligned one penetrated laser beam to be incidentnormally on the exit surface of a prism shaped cell, and the index of liquid inside canbe deduced by the incident angle on the entrance surface according to Snell’s law.The measurement error was under 5  105 for DI water. With this method, we wouldbe capable to distinguish the index variation within 1 Celsius degree. This methodpresented similar merits as minimum deviation method inherently. However, thesimplicities in measurement process and experimental parameters showed greatpotential for accurate index measurement applications.Most of the design and developing works of this measurement system was performedby undergraduate students from Physics Department and Department of Optics andPhotonics. The hardware integration and the data-acquire automation providedpractical learning opportunities for the topics about optics, electronics, programming,and data analysis. The index measurement results can also provide much insight aboutthe temperature or concentration related index variation of liquid. 

Cheng, C., & king-lien, L., & Ku, C. (2011, June), Instrumentation for Highly Accurate Index Measurement of Liquid Paper presented at 2011 ASEE Annual Conference & Exposition, Vancouver, BC. https://peer.asee.org/18198

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