发明名称 |
PHOTODETECTOR ARRAY BASED OPTICAL MEASUREMENT SYSTEMS |
摘要 |
<p>A method and apparatus are provided for analyzing a light pattern produced on a photodetector array wherein a signal from the array is filtered by a low pass filter and then differentiated by at least one differentiator to obtain the first or second derivative of a point or points in the pattern. A zero crossing detector detects the point of zero crossing in the differentiated signal and a timer times this point to obtain the position of the point(s) in the pattern. This technique can be used with back-lit illumination of edge images as well as with diffraction fringes and triangulation spots, among other uses. Further techniques using photodetector arrays are also disclosed.</p> |
申请公布号 |
CA1166750(A) |
申请公布日期 |
1984.05.01 |
申请号 |
CA19810379292 |
申请日期 |
1981.06.08 |
申请人 |
DIFFRACTO LTD. |
发明人 |
LIPTAY-WAGNER, NICHOLAS;RENAUD, ROLAND;PRYOR, TIMOTHY R.;CLARKE, DONALD A. |
分类号 |
B07C5/10;G01B11/02;(IPC1-7):G06K9/82;G06K9/62 |
主分类号 |
B07C5/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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