US Patent No: 4,972,092

Number of patents in Portfolio can not be more than 2000

Apparatus for determining the effective surface roughness of polished optical samples by measuring the integral scattered radiation

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Importance

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Abstract

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Apparatus for determining the effective surface roughness of polished optical samples, by measuring the total integrated scattering, only operates for non-light-transmissive samples. For a transmissive sample, the invention adds a light trap behind the sample for transmitted light, and a diaphragm in front of the sample. The rear surface of the diaphragm is provided with a non-reflective wafing which traps secondary light reflected or scattered by the inside rear surface of the sample.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
DEUTSCHE FORSCHUNGSANSTALT FUR LUFT-UND RAUMFAHRT E.V.COLOGNE38
DEUTSCHE FORSCHUNGSANSTALT FUR LUFT- UND RAUMFAHRT, LINDER HOHE, D-5000 KOLN 90, FED. REP. OF GERMANYCOLOGNE0

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Rosteck, Helmut T A Wolfenbuttel, DE 1 8
Schmitt, Dirk-Roger Braunschweig, DE 3 17

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Swiss Aluminium Ltd. (1)
* 4,703,187 Method and apparatus for the determination of the thickness of transparent layers of lacquer 12 1986
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
6,247,238 Laser marking device 9 1999
 
UNITED MODULE CORPORATION (1)
* 5,726,455 Disk film optical measurement system 35 1996
 
TECHINT COMPAGNIA TECNICA INTERNAZIONALE S.P.A. (1)
6,222,628 Surface characteristics measurement system and method 18 1999
 
HDI INSTRUMENTATION (1)
* 5,898,181 Thin film optical measurement system 11 1997
 
ALLIANCE FOR SUSTAINABLE ENERGY, LLC (1)
* 6,275,295 Optical system for determining physical characteristics of a solar cell 7 1999
 
SCHMITT MEASUREMENT SYSTEMS, INC. (2)
* 5,625,451 Methods and apparatus for characterizing a surface 25 1995
* 5,661,556 System for measuring the total integrated scatter of a surface 11 1996
 
OPTOMACHINES (1)
7,041,997 Device and method for optical control under diffuse illumination and observation means of crockery items or any glazed ceramic products 0 2001
* Cited By Examiner