Acta Photonica Sinica, Volume. 35, Issue 3, 456(2006)
Geometrical Parameters Measurement of Contact Lens With A Novel Imaging Method
An imaging method to measure the geometrical parameters of contact lens is put forward. In imaging method,contact lens is projected into an enlarged image with a projecting lens. An imaging sensor is used to acquire the enlarged image,and a single board computer is adopted to process the image and to do the calculation of parameters. In addition,a glass ring emerged in the liquid was introduced to hold contact lens without any distortion or dehydration. An example of system is provided. With the system,the thickness t can be measured directly,and fore radius r1 and retral radius r2 can be calculated with the help of h1 and h2 and d2 and d2. With an imaging system of 20 times magnification,and a 512 pixels CCD linear imaging sensor of a 50 μm pixel spacing,the system has a resolution of 5 μm,which is much higher than the accuracy requirement of measurement 0.O1 millimeter.
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Chen Weimin, Zhang Jie. Geometrical Parameters Measurement of Contact Lens With A Novel Imaging Method[J]. Acta Photonica Sinica, 2006, 35(3): 456
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Received: Nov. 22, 2004
Accepted: --
Published Online: Jun. 3, 2010
The Author Email: Weimin Chen (wmchen@cqu.edu.cn)
CSTR:32186.14.