Next Article in Journal
Dextran-Thyme Magnesium-Doped Hydroxyapatite Composite Antimicrobial Coatings
Previous Article in Journal
On Magnetohydrodynamic Flow of Viscoelastic Nanofluids with Homogeneous–Heterogeneous Reactions
Previous Article in Special Issue
Luminescence of CsI and CsI:Na Films under LED and X-ray Excitation
Open AccessArticle

Investigation of Photoelastic Property and Stress Analysis for Optical Polyimide Membrane through Stress Birefringence Method

1
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
2
Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(1), 56; https://doi.org/10.3390/coatings10010056
Received: 18 November 2019 / Revised: 2 January 2020 / Accepted: 7 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue Functional Thin Films: Design, Fabrication and Applications)
Optical polyimide (PI) membranes have been increasingly attractive in optoelectronic substrate and optical element material applications. Controlled stress distribution is very important to optical PI membrane-based optics. However, nondestructive absolute stress measurement inside optical PI membranes remains challenging. In this letter, we adopted the stress birefringence method to experimentally investigate the correlation between stress and retardation in uniaxially, biaxially, and circularly stretched PI membranes. The calculated value of the photoelastic coefficient was found to be around 400 nm/Mpa·cm. A theoretical model was established where the retardation angle is the negative arctan of the principal stress ratio in the biaxially stretched membrane. We also found that the average retardation angle is an important parameter for evaluating the uniformity of stretching force in the circularly stretched membrane. This work provides a better understanding of the stress birefringence measurement of membrane materials. View Full-Text
Keywords: optical polyimide membrane; stress analysis; photoelastic property; stress birefringence optical polyimide membrane; stress analysis; photoelastic property; stress birefringence
Show Figures

Figure 1

MDPI and ACS Style

Gao, G.; Mao, D.; Jiang, R.; Li, Z.; Liu, X.; Lei, B.; Bian, J.; Wu, S.; Fan, B. Investigation of Photoelastic Property and Stress Analysis for Optical Polyimide Membrane through Stress Birefringence Method. Coatings 2020, 10, 56.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop