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Proceedings Paper

An experimental calibration method for digital Abbe refractometer
Author(s): Hao Liu; Ke-cheng Yang; Wenping Guo; Jie Dai; Junwei Ye; Wei Li; Min Xia
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Paper Abstract

An improved calibration method for digital Abbe refractometer is proposed. Based on Fresnel reflection theory, digital Abbe refractometer measures the index of refraction by processing bright-dark pattern images. For extreme environment applications, our team has developed a digital Abbe refractometer. By analyzing bright-dark pattern images, it shows optical aberration may reduce positioning accuracy on critical angle. The main work of this paper is to propose a new calibrate method for digital Abbe refractometer. An optical system is built to simulate the refractometer. A motorized micropositioning stage is inserted to precisely control the position of bright-dark boundary. An area CCD captures an image each time boundary displaced. Get the boundary through entire measuring range to form an image database. The database indicates the corresponding relations between bright-dark pattern image acquired by CCD camera and boundary position read by motorized stage. When measuring the refractive index of liquid, match its bright-dark pattern image to images in database, and get the boundary position from the nearest match. Compared to the former method of computing boundary position from images with aberration, the proposed method calibrate refractometer by large amount of experimental data, thus improve stability of the measurement.

Paper Details

Date Published: 21 August 2013
PDF: 8 pages
Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 89081Z (21 August 2013); doi: 10.1117/12.2034682
Show Author Affiliations
Hao Liu, Huazhong Univ. of Science and Technology (China)
Ke-cheng Yang, Huazhong Univ. of Science and Technology (China)
Wenping Guo, Huazhong Univ. of Science and Technology (China)
Jie Dai, Huazhong Univ. of Science and Technology (China)
Junwei Ye, Huazhong Univ. of Science and Technology (China)
Wei Li, Huazhong Univ. of Science and Technology (China)
Min Xia, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 8908:
International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications
Jun Ohta; Nanjian Wu; Binqiao Li, Editor(s)

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