Abstract
Here a refractometer with broad refractive index measurement range is proposed. This refractometer uses the measured liquid as a liquid prism and utilizes CCD and a set of computer software based on Borland C++ to measure the refractive index of liquid. The proposed refractometer has a small volume. Meanwhile the structure and working principle of the proposed refractometer are introduced. Now the mainly used refractometer is Abbe refractometer which has a refractive index measurement range of 1.30-170. While the theoretical results of our work indicate the measurement range can be up to 1.00-3.60 when the vertex angle of the liquid prism is 30°, and the experimental results have proved it is viable.
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