发明名称 |
METHOD AND APPARATUS FOR PARTICLE MEASUREMENT EMPLOYING OPTICAL IMAGING |
摘要 |
A system and method for measuring small particles suspended in a fluid are disclosed. The system employs optical imaging using diffraction enlargement. A sample of small particles illuminated by a light source is imaged onto a pixel array of detector elements using an imaging optical system having a reduced magnification not sufficient for forming a large enough image of a smallest particle of interest. A low- aperture imaging optics with NA < 0.05 is used to add diffraction enlargement to the image corresponding to at least 5 pixels to enable accurate measurement of images of smallest particles of interest, and to increase an optical sampling volume. Suitably programmed processor is used for determining at least a pixel count for each of the diffraction- enlarged images, and for generating a number, size or distribution of particles accounting for pre- determined diffraction enlargement of particle images of different sizes. The method enables analysis of large samples of small particles in one measurement. |
申请公布号 |
CA2487233(C) |
申请公布日期 |
2014.05.13 |
申请号 |
CA20042487233 |
申请日期 |
2004.11.10 |
申请人 |
BRIGHTWELL TECHNOLOGIES INC. |
发明人 |
KING, FREDERICK DAVID;LEBLANC, SERGE EMILE |
分类号 |
G01N15/00;G01N15/02;G01N15/04;G01N21/84 |
主分类号 |
G01N15/00 |
代理机构 |
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代理人 |
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地址 |
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