Optical Monitoring of Film Thickness using Low-Coherence Reflectometry

1997 ◽  
Author(s):  
W. V. Sorin ◽  
S. Venkatesh ◽  
B. L. Heffner
Keyword(s):  
Film Thickness ◽  
Optical Monitoring ◽  
Low Coherence

scholarly journals Interferometric Instrument for Thickness Measurement on Blown Films

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 245
Author(s):  
Michele Norgia ◽  
Alessandro Pesatori
Keyword(s):  
Film Thickness ◽  
Temperature Compensation ◽  
Close Contact ◽  
Thickness Measurement ◽  
The Novel ◽  
Blown Films ◽  
Low Coherence ◽  
Real Time Measurement ◽  
Blown Film ◽  
Standard Techniques

Real-time measurement of plastic film thickness during production is extremely important to guarantee planarity of the final film. Standard techniques are based on capacitive measurements, in close contact with the film. These techniques require continuous calibration and temperature compensation, while their contact can damage the film. Different optical contactless techniques are described in literature, but none has found application to real production, due to the strong vibration of the films. We propose a new structure of low-coherence fiber interferometer able to measure blown film thickness during productions. The novel fiber-optic setup is a cross between an autocorrelator and a white light interferometer, taking the advantages of both approaches.

Thin-film thickness profile measurement using a Mirau-type low-coherence interferometer

2013 ◽  
Vol 24 (7) ◽  
pp. 075002 ◽  
Author(s):  
Young-Sik Ghim ◽  
Hyug-Gyo Rhee ◽  
Ho-Soon Yang ◽  
Yun-Woo Lee
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Profile Measurement ◽  
Thin Film Thickness ◽  
Low Coherence ◽  
Thickness Profile

Applications of Low Coherence Interferometry to Dynamic Oil Film Thickness Measurement

1997 ◽  
pp. 863-869
Author(s):  
S. R. Taplin ◽  
A. Gh. Podoleanu ◽  
D. J. Webb ◽  
D. A. Jackson ◽  
S. R. Nattrass
Keyword(s):  
Film Thickness ◽  
Thickness Measurement ◽  
Oil Film ◽  
Low Coherence ◽  
Low Coherence Interferometry ◽  
Film Thickness Measurement

Optical monitoring of thin oil film thickness in extrusion processes

2005 ◽  
Author(s):  
Robert Bogdanowicz ◽  
Piotr Wroczyński ◽  
Jan Graczyk ◽  
Marcin Gnyba
Keyword(s):  
Film Thickness ◽  
Optical Monitoring ◽  
Oil Film
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