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

Gao, Guohan; Mao, Danbo; Jiang, R. K.; Li, Zhiwei; Liu, Xin; Lei, Baiping; Bian, Jiang; Wu, Shibin; Fan, Bin

doi:10.3390/coatings10010056

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…First, a 100 nm thick gold reflector was deposited on a large-size PET membrane with a thickness of 4 μm using magnetron sputtering technology. Then, a large-size PET membrane was pre-tensioned using membrane tensioning ring [ 26 ], which is a method of applying pre-stress through mechanical stretching. The pre-tensioning force was applied to the PET membrane with a diameter of 68 mm.…”

Section: Fabrication and Packagingmentioning

confidence: 99%

“…The way to apply tensile pre-stress to flexible polymer diaphragms is relatively simple. Due to the flexibility of the polymer diaphragm, the diaphragm tensile pre-stress can be applied by mechanical stretching [ 26 ]. Therefore, a GI acoustic sensor based on a flexible polymer diaphragm is proposed and experimentally demonstrated in this study.…”

Section: Introductionmentioning

confidence: 99%

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A Grating Interferometric Acoustic Sensor Based on a Flexible Polymer Diaphragm

Xiong,

2023

Sensors

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This study presents a grating interferometric acoustic sensor based on a flexible polymer diaphragm. A flexible-diaphragm acoustic sensor based on grating interferometry (GI) is proposed through design, fabrication and experimental demonstration. A gold-coated polyethylene terephthalate diaphragm was used for the sensor prototype. The vibration of the diaphragm induces a change in GI cavity length, which is converted into an electrical signal by the photodetector. The experimental results show that the sensor prototype has a flat frequency response in the voice frequency band and the minimum detectable sound pressure can reach 164.8 µPa/√Hz. The sensor prototype has potential applications in speech acquisition and the measurement of water content in oil. This study provides a reference for the design of optical interferometric acoustic sensor with high performance.

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Section: Fabrication and Packagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Grating Interferometric Acoustic Sensor Based on a Flexible Polymer Diaphragm

Xiong,

2023

Sensors

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“…The photoelastic method has been used to characterize the stress-optical properties of polymer films. Gao et al measured the stress-optical coefficients of optical polyimide (PI) films by uniaxial stretching experiments [29]. In particular, Lee et al calibrated the stress-optical coefficients of PET and PEN films in two orthogonal directions using the split-beam two-dimensional photoelastic technique, and the results showed that their stress-optical coefficients were different in the 0 • and 90 • directions [30].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Characterization of the Anisotropy of the Stress-Optical Properties of Polyethylene Terephthalate Films Based on the Photoelastic Method

Wang

et al. 2022

Polymers

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Polyethylene terephthalate (PET) is one of the most commonly used substrate materials in the field of flexible electronics, and its stress-induced birefringence often has a detrimental effect on the optical properties of the device. Therefore, a deep and systematic understanding of the stress-optical properties of PET films is crucial for device design and manufacture. The photoelastic method is a direct optical measurement technique based on the stress-induced birefringence effect of materials, which has the advantages of being nondestructive and noncontact. In this work, the photoelastic method was used to quantitatively characterize the anisotropy of the stress-optical properties of PET films under the uniaxial stress state. First, a self-built reflection-transmission coaxial bidirectional photoelasticity measurement system was developed by means of a combination of transmission and reflection photoelasticity. Then, the stress-optical coefficients and isoclinic angles of PET films with different stretching angles were measured. Finally, the linear combinations of the photoelastic tensor components and refractive-index-related parameters were determined by fitting the analytical relationship between the stress-optical coefficients and isoclinic angles.

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“…The photoelastic method presents an advantage, compared to other experimental methods, that allows finding the whole stress field from the analysed specimen. Due to the advantages such as precision and rapidness, the photoelastic method continues to be one of the most effective methods for establishing the stress concentration factor [54][55][56][57]. The validation of a model can be obtained in two manners: qualitatively, by comparing the theoretical/numerical fields with the experimental ones provided by isochromatics (curves obtained for the constant difference between the normal principal stresses) [58,59], and quantitatively, by finding the complete stress tensor field; this requires finding, in addition to the isochromatic fields, the isoclinic fields (curves for which the directions of the principal stresses are the same) and the isopachic fields (curves for which the sum of the normal principal stresses is constant) [60][61][62][63].…”

Section: Introductionmentioning

confidence: 99%

Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces

2022

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The stress state from an eccentric ring made of an elastic material symmetrically loaded on the outer boundary by concentrated forces is deduced. The analytical results are obtained using the Airy stress function expressed in bipolar coordinates. The elastic potential corresponding to the same loading but for a compact disk is first written in bipolar coordinates, then expanded in Fourier series, and after that, an auxiliary potential of a convenient form is added to it in order to impose boundary conditions. Since the inner boundary is unloaded, boundary conditions may be applied directly to the total potential. A special focus is on the number of terms from Fourier expansion of the potential in bipolar coordinates corresponding to the compact disk as this number influences the sudden increase if the coefficients from the final form of the total potential. Theoretical results are validated both by using finite element software and experimentally through the photoelastic method, for which a device for sample loading was designed and constructed. Isochromatic fields were considered for the photoelastic method. Six loading cases for two different geometries of the ring were studied. For all the analysed cases, an excellent agreement between the analytical, numerical and experimental results was achieved. Finally, for all the situations considered, the stress concentration effect of the inner hole was analytically determined. It should be mentioned that as the eccentricity of the inner hole decreases, the integrals from the relations of the total elastic potential present a diminishing convergence in the vicinity of the inner boundary.

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

Cited by 7 publications

References 22 publications

A Grating Interferometric Acoustic Sensor Based on a Flexible Polymer Diaphragm

A Grating Interferometric Acoustic Sensor Based on a Flexible Polymer Diaphragm

Quantitative Characterization of the Anisotropy of the Stress-Optical Properties of Polyethylene Terephthalate Films Based on the Photoelastic Method

Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces

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