A Concept for Measuring and Evaluating Optical Anisotropy Effects in Tempered Architectural Glass (1st ed. 2023)

Optical anisotropy effects can occur in building envelopes made of tempered glass. The visual effect has been neglected in the evaluation of the building product and increasingly leads to disputes between the parties involved. This thesis extends the state of knowledge on the cause and perception of optical anisotropic effects and presents a concept for measuring and evaluating them in flat monolithic tempered architectural glass. Initially, an overview and description of current photoelastic measurement methods are given, and the accuracy of the used measurement setups is veri�ed for the �rst time. The experimental basis for the concept is formed by extensive full-�eld retardation measurements in the laboratory and �eld studies of the maximum visibility of the anisotropy effects in an outdoor test rig with accompanying polarization measurements of the sky. Various glass types, geometries, and tempering levels are selected based on typically used products, and their influence on the resulting retardation image is investigated. Determining a correlation of the retardation images with the reflection images of selected test specimens in the outdoor test rig complements the experiments. Based on this, digital evaluation methods are presented, further developed, and applied to the measured retardation images. From the critical analysis of these results, limit values for different anisotropy quality classes are derived, and the concept is complemented. With the implementation of the evaluation methods and the limit values in commercial anisotropy scanners, the quality of each glass pane can be determined directly after tempering in the future. By choosing the highest quality class A, it will be possible in the future to signi�cantly reduce anisotropy effects in constructions made of tempered glass panes.

General

Imprint:	Springer Vieweg
Country of origin:	Germany
Series:	Mechanik, Werkstoffe und Konstruktion im Bauwesen, 70
Release date:	September 2023
First published:	2023
Authors:	Steffen Dix
Dimensions:	240 x 168mm (L x W)
Pages:	152
Edition:	1st ed. 2023
ISBN-13:	978-3-658-42028-4
Categories:	Books
LSN:	3-658-42028-6
Barcode:	9783658420284

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