Precise thickness profile measurement insensitive to spatial and temporal temperature gradients on a large glass substrate

When manufacturing glass substrates for display devices, especially for large-sized ones, the time-varying spatial temperature gradient or distribution on the samples is remarkably observed. It causes serious degradation of thickness measurement accuracy due to the combination of thermally expanded...

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Bibliographic Details
Published in:Applied optics (2004) 2020-07, Vol.59 (20), p.5881
Main Authors: Park, Jungjae, Mori, Hiroki, Jang, Yoon-Soo, Jin, Jonghan
Format: Article
Language:English
Subjects:
Accuracy
Degradation
Display devices
Glass substrates
Mathematical analysis
Mathematical models
Optical thickness
Profile measurement
Refractivity
Room temperature
Synchronism
Temperature
Temperature dependence
Temperature distribution
Temperature gradients
Thermal expansion
Thickness measurement
Time synchronization
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Summary:When manufacturing glass substrates for display devices, especially for large-sized ones, the time-varying spatial temperature gradient or distribution on the samples is remarkably observed. It causes serious degradation of thickness measurement accuracy due to the combination of thermally expanded thickness and temperature-dependent refractive index. To prevent or minimize the degradation in thickness measurement accuracy, the temperature distribution over an entire glass substrate has to be known in real time in synchronization with the thickness measurement to specify the refractive index of the sample based on an exact mathematical model of the temperature-dependent refractive index. In this paper, a measurement method for determining the thickness profile of a large glass substrate regardless of precise measurement of temperature distribution and the mathematical model of the refractive index was demonstrated. The widely used glass substrates with nominal thicknesses of 0.6 mm and 1.3 mm were measured at room and high temperatures. Through comparison of thickness profiles of hot glass substrates having large temperature gradients and those estimated through thermal expansion of thickness profiles measured at room temperature, it was confirmed that the proposed method can provide highly reliable thickness measurement results under such challenging conditions, unlike simple calculation from the optical thickness using the well-known refractive index.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.396550