发明名称 |
Method and arrangement for optically determining surface profiles |
摘要 |
A surface is subjected to a light field whose intensity is periodically modulated in a vertical direction to evaluate a scattered light pattern. The light field is obtained from interference between a first or central beam with vertical incidence and two symmetrical laterally disposed beams with oblique incidence. All beams are focussed to a common spot if the profile is obtained by scanning the surface or are superimposed as collimated beams if large area profiling is desired. The surface is imaged onto a diaphragm which selects appropriate locations of the surface for measurements by a photodetector to record sinusoidal intensity variations that are obtained when the light is periodically shifted in a vertical direction by phase modulating the first or central beam with respect to the lateral beams.
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申请公布号 |
US4714348(A) |
申请公布日期 |
1987.12.22 |
申请号 |
US19860940667 |
申请日期 |
1986.12.11 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
MAKOSCH, GUNTER |
分类号 |
G01B11/30;G01B9/02;G01B11/24;(IPC1-7):G01B9/02 |
主分类号 |
G01B11/30 |
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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