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Journal articles on the topic 'Thermal and optical stress'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Shiue, Sham-Tsong, and Wen-Hao Lee. "Thermal stresses in carbon-coated optical fibers at low temperature." Journal of Materials Research 12, no. 9 (1997): 2493–98. http://dx.doi.org/10.1557/jmr.1997.0329.

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The thermal stresses in carbon-coated optical fibers at low temperature have been analyzed. The thermally induced lateral pressure in the glass fiber would produce microbending loss. In order to minimize such a microbending loss, the thickness, Young's modulus, and Poisson's ratio of the carbon coating should be decreased. On the other hand, the maximum thermal stress is the tangential stress in the carbon coating that occurs at the interface of the carbon coating and glass fiber. It was experimentally observed that if the maximum thermal stress is larger than the tensile strength of the carbo

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2

Huang, Cai Hua, Xiao Hua Sun, Yi Hua Sun, and Jun Zou. "Thermal Effects Caused by Inclusions in Optical Films Irradiated by CW Laser." Advanced Materials Research 634-638 (January 2013): 2609–12. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2609.

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A steady thermal conduction model was presented to study the temperature field and thermal stress distribution in film irradiated by continuous wave laser. The thermal effects may arise from either the absorbing inclusions or the intrinsic absorption of film. Based on the plane thermal conduction assumption, the characteristics of damage resulted from local melting or evaporation and thermal stress were discussed. The damage region resulted from local melting or evaporation smaller than that from thermal stress. The circumferential stress σθis the main cause accounting for the stress damage. T

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3

Hu, Fu Kai, De Jian Zhou, and Lei Cheng. "Research and Design of Optical-Fiber-Embedded Structure in Optical Printed Circuit Board under Thermal Shock." Advanced Materials Research 763 (September 2013): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amr.763.238.

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To improve the serviceability of embedded optical fiber in OPCB, the paper discussed the optical-fiber-embedded structure in OPCB from the aspects of stress. Firstly, discussed optical fiber, groove and whether to use filler and provided six kinds of embedded structures. Then, finite element models were built for thermal simulation and thermal stress in fiber was calculated. Finally, compared different embedded structures from the stress in fiber and gave some suggestion about the design of embedded structure. The study proved that glass fiber is a better selection for OPCB; the stress concent

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4

HIGUCHI, Masaya, and Koji SHIMIZU. "Evaluation of thermal stress by optical interferometric method." Proceedings of Autumn Conference of Tohoku Branch 2004.40 (2004): 49–50. http://dx.doi.org/10.1299/jsmetohoku.2004.40.49.

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5

Evans, K. E. "Thermal stress mechanisms in optical storage thin films." Journal of Applied Physics 63, no. 10 (1988): 4946–50. http://dx.doi.org/10.1063/1.340438.

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6

Liang, Xianpeng, Bowen Liu, Quan Yuan, et al. "Fine Control of Optical Properties of Nb2O5 Film by Thermal Treatment." Micromachines 15, no. 12 (2024): 1453. http://dx.doi.org/10.3390/mi15121453.

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Thermal treatment is a common method to improve the properties of optical thin films, but improper thermal treatment processing will result in the degradation of the optical properties of the optical thin film. The thermal stability of niobium oxide (Nb2O5) thin films prepared by magnetron sputtering was systematically studied by analyzing the roughness and morphology of the film under different thermal treatment processes. The results show that the amorphous stability of the Nb2O5 thin film can be maintained up to 400 °C. Before crystallization, with an increase in annealing temperature, the

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Gao, You Tang, Shuo Liu, and Yuan Xu. "Analysis of Thermal Shock and Stress with Infrared Optical Domes." Applied Mechanics and Materials 325-326 (June 2013): 332–35. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.332.

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The development of infrared optical materials is always closely related to the research and exploration of material science. The infrared optical domes bears shock and produces stress when the infrared optical domes mounted on the missile moving at a high speed is shocked by high temperature. According to aerodynamics theory and thermo shock theory, the surge current will be transferred to optical parts through holding up layer and warms the surface of optical parts when infrared optical parts are shocked by high temperature. A compress stress is formed on the hot external surface of optical p

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8

Liu, Yueai, B. M. A. Rahman, and K. T. V. Grattan. "Thermal-stress-induced birefringence in bow-tie optical fibers." Applied Optics 33, no. 24 (1994): 5611. http://dx.doi.org/10.1364/ao.33.005611.

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9

Wong, D. "Thermal stability of intrinsic stress birefringence in optical fibers." Journal of Lightwave Technology 8, no. 11 (1990): 1757–61. http://dx.doi.org/10.1109/50.60576.

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10

Lee, Kyoungho, and Joong Seok Lee. "Optimal Design of the Flexure Mount for Optical Mirror Using Topology Optimization Considering Thermal Stress Constraint." Journal of the Korea Institute of Military Science and Technology 25, no. 6 (2022): 561–71. http://dx.doi.org/10.9766/kimst.2022.25.6.561.

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An optical mirror assembly is an opto-mechanically coupled system as the optical and mechanical behaviors interact. In the assembly, a flexure mount attached to an optical mirror should be flexible in the radial direction, but rigid for the remaining degrees of freedom for supporting the mirror rigidly and suppressing the wavefront error of the optical mirror. This work presents an optimal design of the flexure mount using topology optimization with thermal stress constraint. By simplifying the optical mirror assembly into finite shell elements, topology optimization model was built for effici

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11

Chen, Tei-Chen, Ching-Jiung Chu, Chang-Hsien Ho, Chung-Chen Wu, and Cheng-Chung Lee. "Determination of stress-optical and thermal-optical coefficients of Nb2O5 thin film material." Journal of Applied Physics 101, no. 4 (2007): 043513. http://dx.doi.org/10.1063/1.2435796.

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12

Knoll, R. W., and C. H. Henager. "Optical and physical properties of sputtered Si:Al:O:N films." Journal of Materials Research 7, no. 5 (1992): 1247–52. http://dx.doi.org/10.1557/jmr.1992.1247.

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Mechanical and optical properties and structural characteristics are described for Si:N films with Al and O additions (SixAl1−xOyN1−y) deposited by reactive RF diode sputtering on Si and SiO2 substrates. The thermal and intrinsic stress components, elastic stiffness, coefficient of thermal expansion (CTE), and refractive index were measured for films ranging in thickness from ∼2 μm to 50 μm. Some structural and microstructural data were obtained using x-ray diffraction, optical and scanning-electron microscopy, and surface profilometry. Alloying Si:N with Al to form Si:Al:N greatly reduced the

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13

Gong, Mingfeng, Xuejiao Sun, Cheng Lei, et al. "Study on the Degradation Performance of AlGaN-Based Deep Ultraviolet LEDs under Thermal and Electrical Stress." Coatings 14, no. 7 (2024): 904. http://dx.doi.org/10.3390/coatings14070904.

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AlGaN-based deep-ultraviolet (DUV) LEDs could realize higher optical power output when adopting a p-AlGaN contact layer instead of a p-GaN contact layer. However, this new type DUV LEDs exhibit poor reliability. Thus, this study thoroughly investigates the degradation behaviors of AlGaN-based DUV LEDs with a p-AlGaN contact layer through different aging tests, including single thermal stress, single electrical stress with air-cooling, single electrical stress, and thermoelectric complex stress. It can be found that both high temperature and large working current play crucial roles in accelerat

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14

Ylivaara, Oili M. E., Andreas Langner, Satu Ek, et al. "Thermomechanical properties of aluminum oxide thin films made by atomic layer deposition." Journal of Vacuum Science & Technology A 40, no. 6 (2022): 062414. http://dx.doi.org/10.1116/6.0002095.

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In microelectromechanical system devices, thin films experience thermal processing at temperatures some cases exceeding the growth or deposition temperature of the film. In the case of the thin film grown by atomic layer deposition (ALD) at relatively low temperatures, post-ALD thermal processing or high device operation temperature might cause performance issues at device level or even device failure. In this work, residual stress and the role of intrinsic stress in ALD Al2O3 films grown from Me3Al and H2O, O3, or O2 (plasma ALD) were studied via post-ALD thermal processing. Thermal expansion

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15

Blázquez-Castro, Alfonso. "Optical Tweezers: Phototoxicity and Thermal Stress in Cells and Biomolecules." Micromachines 10, no. 8 (2019): 507. http://dx.doi.org/10.3390/mi10080507.

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For several decades optical tweezers have proven to be an invaluable tool in the study and analysis of myriad biological responses and applications. However, as with every tool, they can have undesirable or damaging effects upon the very sample they are helping to study. In this review the main negative effects of optical tweezers upon biostructures and living systems will be presented. There are three main areas on which the review will focus: linear optical excitation within the tweezers, non-linear photonic effects, and thermal load upon the sampled volume. Additional information is provide

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16

Huang, M., and X. Yan. "Thermal-stress effects on the temperature sensitivity of optical waveguides." Journal of the Optical Society of America B 20, no. 6 (2003): 1326. http://dx.doi.org/10.1364/josab.20.001326.

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17

Nkansah, M. A., and K. E. Evans. "Modeling delamination due to thermal stress in optical storage media." Journal of Applied Physics 67, no. 7 (1990): 3243–48. http://dx.doi.org/10.1063/1.345356.

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18

Fu, Libin, Hugh A. McKay, and Liang Dong. "Extremely large mode area optical fibers formed by thermal stress." Optics Express 17, no. 14 (2009): 11782. http://dx.doi.org/10.1364/oe.17.011782.

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19

Shi, Nannan, Yanyu Chen, and Zhenbao Li. "Crack Risk Evaluation of Early Age Concrete Based on the Distributed Optical Fiber Temperature Sensing." Advances in Materials Science and Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/4082926.

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Cracks often appear in concrete arch dams, due to the thermal stress and low tensile strength of early age concrete. There are three commonly used temperature controlling measures: controlling the casting temperature, burying cooling pipe, and protecting the surface. However, because of the difficulty to obtain accurate temperature and thermal stress field of the concrete, the rationality and economy of these measures are not assessed validly before and after construction. In this paper, a crack risk evaluation system for early age concrete is established, including distributed optical fiber t

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20

Ching-Kong Chao, Shih-Yu Hung, and Cheng-Ching Yu. "Thermal stress analysis for rapid thermal processor." IEEE Transactions on Semiconductor Manufacturing 16, no. 2 (2003): 335–41. http://dx.doi.org/10.1109/tsm.2003.811884.

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21

Aversano, Lerina, Mario Luca Bernardi, and Marta Cimitile. "Water stress classification using Convolutional Deep Neural Networks." JUCS - Journal of Universal Computer Science 28, no. 3 (2022): 311–28. http://dx.doi.org/10.3897/jucs.80733.

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In agriculture, given the global water scarcity, optimizing the irrigation system have become a key requisite of any semi-automatic irrigation scheduling system. Using efficient assessment methods for crop water stress allows reduced water consumption as well as improved quality and quantity of the production. The adoption of Neural Network can support the automatic in situ continuous monitoring and irrigation through the real-time classification of the plant water stress. This study proposes an end-to-end automatic irrigation system based on the adoption of Deep Neural Networks for the multin

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Aversano, Lerina, Mario Luca Bernardi, and Marta Cimitile. "Water stress classification using Convolutional Deep Neural Networks." JUCS - Journal of Universal Computer Science 28, no. (3) (2022): 311–28. https://doi.org/10.3897/jucs.80733.

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In agriculture, given the global water scarcity, optimizing the irrigation system have become a key requisite of any semi-automatic irrigation scheduling system. Using efficient assessment methods for crop water stress allows reduced water consumption as well as improved quality and quantity of the production. The adoption of Neural Network can support the automatic in situ continuous monitoring and irrigation through the real-time classification of the plant water stress. This study proposes an end-to-end automatic irrigation system based on the adoption of Deep Neural Networks for the multin

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23

Liu, Shuaishuai, Bin Yang, Yuan Zhi, and Xiaohui Yu. "Thermal-mechanical performance analysis of parabolic trough receivers under various optical errors based on coupled optical-thermal-stress model." Renewable Energy 210 (July 2023): 687–700. http://dx.doi.org/10.1016/j.renene.2023.04.091.

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24

Ding, Junling, Yu Zhang, Yuankai Hao, and Xiuwei Fu. "Modelling and Control of Thermal Stress in TSLAG (Tb3Sc1.95Lu0.05Al3O12) Magneto-Optical Crystals Grown by Czochralski Method." Crystals 14, no. 6 (2024): 564. http://dx.doi.org/10.3390/cryst14060564.

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Tb3Sc1.95Lu0.05Al3O12 (TSLAG) crystals are novel and high-quality magneto-optical materials with the most promising application as the core component of Faraday devices. Cracking is an obstacle to TSLAG crystal growth and is closely influenced by crystal thermal stress distribution. In this work, the evolution of thermal stress during TSLAG crystal growth in the initial Czochralski (Cz) furnace is numerically studied. The reasons for high thermal stress in TSLAG crystal are explained based on the results about the melt flow, the temperature distribution in the furnace, and the crystal/melt int

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25

Liu, Shen, Hang Xiao, Yanping Chen, et al. "Nano-Optomechanical Resonators Based on Suspended Graphene for Thermal Stress Sensing." Sensors 22, no. 23 (2022): 9068. http://dx.doi.org/10.3390/s22239068.

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Nanomechanical resonators made from suspended graphene combine the properties of ultracompactness and ultrahigh detection sensitivity, making them interesting devices for sensing applications. However, nanomechanical systems can be affected by membrane stress. The present work developed an optomechanical resonator for thermal stress sensing. The proposed resonator consists of a section of hollow core fiber (HCF) and a trampoline graphene–Au membrane. An all-optical system that integrated optical excitation and optical detection was applied. Then, the resonance frequency of the resonator was ob

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26

Hirokawa, Yoshihiro, Haruki Nishi, Minoru Yamada, Shinsaku Zama, and Ken Hatayama. "Fracture Probability Analysis of Crack Occurrence on a Floating Roof due to Thermal Stress." Advanced Materials Research 622-623 (December 2012): 1539–44. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.1539.

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Several cracks were found on some actual floating roofs of a crude oil tank in the oil refinery located in southern Japan. We assumed that one of reasons would be due to thermal stress caused by temperature changes during the day. In order to consider whether the thermal stress could the cause damages on the floating roof, strain and temperature were measured on the actual floating roof by using optical fiber gauges. Furthermore, fracture possibility due to thermal stress was calculated to discuss whether thermal stress could cause fracture or not. As a result, the probability showed that ther

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27

Sasaki, Yoshida, Ogawa, Shitaka, and McGibboney. "Effect of Residual Stress on Thermal Deformation Behavior." Materials 12, no. 24 (2019): 4141. http://dx.doi.org/10.3390/ma12244141.

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This paper discusses a non-destructive measurement technique of residual stress through optical visualization. The least amount of deformation possible is applied to steel plates by heating the specimens +10 °C from room temperature for initial calibration, and the thermal expansion behavior is visualized with an electronic speckle pattern interferometer sensitive to two dimensional in-plane displacement. Displacement distribution with the thermal deformation and coefficient of thermal expansion are obtained through interferometric fringe analysis. The results suggest the change in the thermal

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Hirokawa, Yoshihiro, Haruki Nishi, Minoru Yamada, Shinsaku Zama, and Ken Hatayama. "Study on Damage of a Floating Roof-Type Oil Storage Tank due to Thermal Stress." Applied Mechanics and Materials 232 (November 2012): 803–7. http://dx.doi.org/10.4028/www.scientific.net/amm.232.803.

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Several cracks were found on some actual floating roofs of a crude oil tank in the oil refinery located in southern Japan. We assumed that one of reasons would be due to thermal stress caused by temperature changes during the day. In order to consider whether the thermal stress could the cause damages on the floating roof, strain and temperature were measured on the actual floating roof by using optical fiber gauges. Furthermore, thermal stress analysis was carried out as effective analysis.

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29

Tzeng, P. Y., C. H. Liu, W. K. Li, and C. Y. Soong. "Theoretical Analysis of Cylindrical Microparticle Photophoresis in a Perpendicular Optical Field with Thermal Stress Slip Model." Journal of Mechanics 28, no. 1 (2012): 113–21. http://dx.doi.org/10.1017/jmech.2012.12.

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ABSTRACTThe present study is concerned with a theoretical analysis of the photophoresis of a microsized long cylinder in a perpendicular optical field. Different from previous studies of photophoresis, thermal stress slip usually neglected is taken into account in the analysis. The gaseous fluid relative to the microparticle in photophoretic motion falls into slip-flow regime. Asymmetric distribution of the absorbed heat energy within the particle becomes the driving force for photophoretic motion of the cylinder-shaped particle. By evaluating heat source function distributions at various cond

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Yan, Dan, Wei Lu, Lili Qiu, Zihui Meng, and Yu Qiao. "Thermal and stress tension dual-responsive photonic crystal nanocomposite hydrogels." RSC Advances 9, no. 37 (2019): 21202–5. http://dx.doi.org/10.1039/c9ra02768h.

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31

Miller, W., C. W. Smith, P. Dooling, A. N. Burgess, and K. E. Evans. "Tailored thermal expansivity in particulate composites for thermal stress management." physica status solidi (b) 245, no. 3 (2008): 552–56. http://dx.doi.org/10.1002/pssb.200777710.

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OZAKI, Tsuyoshi, and Shigenori Kabashima. "256 Thermal stress analysis of OSR (Optical Solar Reflector) in satellite structures." Proceedings of the 1992 Annual Meeting of JSME/MMD 2001 (2001): 227–28. http://dx.doi.org/10.1299/jsmezairiki.2001.0_227.

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33

Benino, Yasuhiko, Takumi Fujiwara, and Takayuki Komatsu. "Development of New Crystallized Glasses with Nanocrystals and Nonlinear Optical Properties." Advanced Materials Research 11-12 (February 2006): 189–92. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.189.

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New crystallized glasses with nonlinear optical properties are developed by various thermal processes for glassy materials which involve the precisely controlled heat-treatment and the novel crystallization patterning using laser spot heating technique. The nonlinear optical functions and their applications are discussed based on the morphologies of the precipitated crystalline phases. The enhancement of the nonlinear optical properties can be expected by introduction of internal stress during the thermal process.

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34

Zhao, Zhan Feng, and Juan Ye. "Design Key Points for High Power LED Encapsulation." Advanced Materials Research 651 (January 2013): 706–9. http://dx.doi.org/10.4028/www.scientific.net/amr.651.706.

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LED performance was significantly improved because of the improvement of encapsulation design and materials properties. The design key points were reviewed in point view of optical, electrical, thermal, and reliability consideration. It was concluded that the packaging design should be simultaneously implemented with the chip design, integrally considering the optics, electrics, thermal, and reliability together. The interfacial thermal resistance and stress from packaging also play critical roles for the optical efficiency and reliability of packaged LED device.

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35

Venerus, David C., David Nieto Simavilla, and Jay D. Schieber. "THERMAL TRANSPORT IN CROSS-LINKED ELASTOMERS SUBJECTED TO ELONGATIONAL DEFORMATIONS." Rubber Chemistry and Technology 92, no. 4 (2019): 639–52. http://dx.doi.org/10.5254/rct.19.80382.

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ABSTRACT Investigations on thermal transport in cross-linked elastomers subjected to elongational deformations are reviewed and discussed. The focus is on experimental research, in which the deformation-induced anisotropy of the thermal conductivity tensor in several common elastomeric materials is measured using novel optical techniques developed in our laboratory. These sensitive and noninvasive techniques allow for the reliable measurement of thermal conductivity (diffusivity) tensor components on samples in a deformed state. When combined with measurements of the stress in deformed samples

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Guo, Y., and S. Liu. "Development in Optical Methods for Reliability Analysis in Electronic Packaging Applications." Journal of Electronic Packaging 120, no. 2 (1998): 186–93. http://dx.doi.org/10.1115/1.2792619.

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The mechanical analysis of electronic packaging has significant impact on the system reliability of an electronic device, and, therefore, is critical in packaging design and manufacturing. The main concerns of the mechanical analysis are the thermal strain/stress, interfacial failures, and the fatigue life of components and interconnections. As electronic technology advances, electronic packages are becoming smaller and smaller. Strain/stress concentrations are frequently localized in very tiny zones with high magnitudes. Determinations of thermal strain/stress and predictions of failure and r

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Wang, Kai, and Robert R. Reeber. "Thermal Residual Stress Modeling in AlN and GaN Multi Layer Samples." MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999): 209–14. http://dx.doi.org/10.1557/s1092578300002477.

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Thermal residual stresses can detrimentally affect the electronic and optical properties of epitaxial films thereby shortening device lifetime. Based on our earlier work on thermal expansion of nitrides, we provide a finite element modeling analysis of the residual stress distribution of multilayered GaN and AlN on 6H-SiC. The effects of thickness and growth temperatures are considered in the analysis.

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Jessy, Bagh1 &. Nirupama Dalai2. "Thermal stress management in poultry." Science world a Monthly e magazine 5, no. 5 (2025): 7158–62. https://doi.org/10.5281/zenodo.15519181.

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The poultry industry has been widely recognized as one of the most rapidly growing sector within the global agricultural sector (FAO 2023). Environmental variation is a key factor influencing the sustainability of livestock production systems in tropical climate (Sinha <em>et al.,</em> 2017). Chickens are highly sensitive to changes of environmental temperature with extreme weather conditions resulting in impacting their growth, egg production and overall health. In order to achieve optimal growth and economic returns, it is essential to maintained an ideal temperature for poultry.

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Huang, Shengzhou, Chengwei Jiang, Zhaowei Tian, et al. "Mechanism Study of Ultrasonic Vibration-Assisted Microgroove Forming of Precise Hot-Pressed Optical Glass." Micromachines 14, no. 7 (2023): 1299. http://dx.doi.org/10.3390/mi14071299.

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Microgroove structures with helical pitches in a wavelength level are increasingly required in optical areas. However, conventional manufacturing techniques generate relatively high stresses during pressing, resulting in poor precision when forming microgrooves. This paper reports on the mechanism of the ultrasonic vibration-assisted microgroove forming of precise hot-pressed optical glass. A finite element (FE) thermocompression model of the viscoelastic material was developed and the entire forming process was numerically simulated using coupled thermal-structural analysis. The analysis of s

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40

Mohamad, Khaled. "Exploring the influence of optical and thermal parameters on the effectiveness of parabolic trough collector receiver units." Clean Energy 8, no. 4 (2024): 15–33. http://dx.doi.org/10.1093/ce/zkae033.

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Abstract This study investigates the optimization of physical parameters in a parabolic trough collector receiver unit to improve its thermal and optical performance. The parameters include the transmissivity, reflectivity, absorptivity, emissivity and thermal conductivity of the outer cover and absorber pipe. This study utilizes a novel experimental design and a simulation model that accounts for the infrared reflectivity inside the receiver. The simulation results were validated by the experimental data, with a maximum deviation of 8%. The study analyses the effects of varying the physical p

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Chen, Guoxin, Xingyu Lu, Jin Yan, Hongwei Liu, and Baoguang Sang. "High-Temperature Deformation Behavior of M50 Steel." Metals 12, no. 4 (2022): 541. http://dx.doi.org/10.3390/met12040541.

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The hot deformation characteristics of M50 steel in the temperature range of 900–1150 °C and strain-rate range of 0.01–10 s−1 was investigated in this study using a Gleeble-3800 thermal simulation testing machine. The true stress–strain curves showed that the deformation resistance increased with decreasing deformation temperature, and increasing strain rate before the peak stress was reached. After the peak stress, dynamic reversion occurred, and consequently, the deformation stress decreased. The softening phenomenon was more obvious when the strain rate was low. The calculated values of the

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Wang, C., Y. Z. Wang, X. T. Jiang, et al. "Thermal stress-induced all-optical modulation in MXene-coated polarization maintaining fiber." Laser Physics Letters 16, no. 6 (2019): 065107. http://dx.doi.org/10.1088/1612-202x/ab1017.

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Kim, Jong Sun, Kyung Hwan Yoon, and Julia A. Kornfield. "Measurement of Stress-Optical Coefficients of COC’s with Different Composition." Key Engineering Materials 326-328 (December 2006): 183–86. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.183.

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Rheo-optical and mechanical properties of Cyclic Olefin Copolymers(COC’s) with different composition have been investigated across the glass transition temperature. Accurate measurement of stress or strain-optical coefficients and elastic modulus data across the glass transition are essential for predicting optical anisotropy in many optical products like pickup lenses and waveguides in LCD backlight unit since the material of these products have both flow and thermal history from the melt to glass. To obtain stress-optic behavior in the wide frequency region including rubbery, glassy and glas

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Huang, Cai Hua, Xiao Hua Sun, Yi Hua Sun, and Jun Zou. "Thermal Effects Induced by Absorbing Inclusions in Laser Optical Films." Advanced Materials Research 602-604 (December 2012): 1427–30. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.1427.

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The thermal transportation caused by absorbing inclusions in optical films under the radiation of laser pulse is unsteady heat conduction. The temperature distribution in films is ununiform and time-dependent. Considering the small size of inclusions, the absorbing inclusions were treaded as dot-heat sources. Based on this assumption, the unsteady heat conduction model was brought out and the temperature distribution in films was figured out and discussed, the mechanism that the catastrophic damage may avoid with micro-damage or micro-deformation in films through the release of stress concentr

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Sokalski, Peter, Zherui Han, Gabriella Coloyan Fleming, et al. "Effects of hot phonons and thermal stress in micro-Raman spectra of molybdenum disulfide." Applied Physics Letters 121, no. 18 (2022): 182202. http://dx.doi.org/10.1063/5.0122945.

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Micro-Raman spectroscopy has become an important tool in probing thermophysical properties in functional materials. Localized heating by the focused Raman excitation laser beam can produce both stress and local nonequilibrium phonons in the material. Here, we investigate the effects of hot optical phonons in the Raman spectra of molybdenum disulfide and distinguish them from those caused by thermally induced compressive stress, which causes a Raman frequency blue shift. We use a thermomechanical analysis to correct for this stress effect in the equivalent lattice temperature extracted from the

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Jassim, Abdulsattar M. "Thermal performance of Parabolic Trough Solar Collector." Al-Salam Journal for Engineering and Technology 3, no. 1 (2023): 128–40. http://dx.doi.org/10.55145/ajest.2024.03.01.011.

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The research progress of numerical simulation of parabolic trough solar collector was introduced. Especially the numerical simulation studies of the internal flow field in the collector tube and the external flow field of the concentrator were reviewed. In the study of the internal flow field in the collector tube, the type of heat transfer fluids and the characteristics of optical concentration have a significant effect on the heat collection performance and thermal stress distribution, especially in the water/steam medium heat collection loop. The unique gas-liquid two phase flow superpositi

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Beeri, Ofer, Rom Tarshish, Ran Pelta, and Tal Shilo. "Utilizing Optical Satellite Imagery to Monitor Temporal and Spatial Changes of Crop Water Stress: A Case Study in Alfalfa." Water 14, no. 11 (2022): 1676. http://dx.doi.org/10.3390/w14111676.

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Since the 1980s, thermal imagery has been used to assess crop water stress. The increase in the temporal resolution of optical satellite sensors (in the range of 400–2500 nm) and the better spatial resolution compared to the thermal imagery call for the definition of a new way for crop water stress monitoring. Hence, we are suggesting a new method utilizing spectral indices from three subsequent images to address this challenge. This method predicts the current water stress with the two past images and compares it to the current stress: if the existing conditions are better than the predicted

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Ye, Xia, Hong Bing Yao, Yan Qun Tong, et al. "Experiment Study of Influence on Laser Beam Quality Induced by Thermal Lens Effect and Depolarization Effect." Applied Mechanics and Materials 43 (December 2010): 670–74. http://dx.doi.org/10.4028/www.scientific.net/amm.43.670.

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For high power and repetitive Nd:Glass laser, there would appear serious thermal effect due to the significantly-enhanced pumping optical power density in laser rod, which would induce thermal double refraction, phase distortion, thermal focusing, thermal depolarization, etc. Thus, the laser output power and beam quality would be influenced severely. Influence of thermal lens effect and depolarization effect caused by thermal stress double refraction on laser beam were studied in this paper for high power and repetitive laser. In the experiment of thermal lens effect, change of the laser spot

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Wang, Zong, Yanheng Zhang, Ning Lu, Zhiyong Wang, and Wei Qiu. "Measurement of Stress Optic Coefficient for Thermal Barrier Coating Based on Terahertz Time-Domain Spectrum." Coatings 11, no. 10 (2021): 1265. http://dx.doi.org/10.3390/coatings11101265.

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The residual stress introduced inside the thermal barrier coating (TBC) top coating during manufacturing and service processes is one of the main causes of thermal barrier failure. Therefore, a nondestructive and accurate measurement of the residual stress in top coating is essential for the evaluation of TBC life. The terahertz time-domain spectroscopy (THz-TDS) technique, which is based on the calibration or measurement of the stress optical coefficients of the measured materials, is applicable to the measuring of internal stress of nonmetal materials. In this work, to characterize the inter

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Wu, Cheng-Wei, Xue Ren, Shi-Yi Li, Yu-Jia Zeng, Wu-Xing Zhou, and Guofeng Xie. "Significant regulation of stress on the contribution of optical phonons to thermal conductivity in layered Li₂ZrCl₆: First-principles calculations combined with the machine-learning potential approach." Applied Physics Letters 121, no. 17 (2022): 172201. http://dx.doi.org/10.1063/5.0122357.

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The layered solid electrolyte Li2ZrCl6 and Li metal electrodes have a very good contact stability, but the thermal transport properties of Li2ZrCl6 are still unclear. Here, we systematically study the intrinsic lattice thermal conductivity ( κp) of Li2ZrCl6 using the machine-learning potential approach based on first-principles calculations combined with the Boltzmann transport theory. The results show that the κp of Li2ZrCl6 at room temperature is 3.94 W/mK along the in-plane (IP) direction and 1.05 W/mK along the out-plane (OP) direction, which means that the κp is significantly anisotropic.

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