Thermally induced stresses in an optical glass fiber soldered into a ferrule

1994 ◽  
Vol 12 (10) ◽  
pp. 1766-1770 ◽  
Author(s):  
E. Suhir
Keyword(s):  
Glass Fiber ◽  
Optical Glass ◽  
Thermally Induced ◽  
Induced Stresses ◽  
Optical Glass Fiber

Thermal stress in a polymer-coated optical glass fiber with a low-modulus coating at the ends

2001 ◽  
Vol 16 (10) ◽  
pp. 2996-3004 ◽  
Author(s):  
E. Suhir
Keyword(s):  
Glass Fiber ◽  
Optical Glass ◽  
Calculated Data ◽  
Dissimilar Materials ◽  
Theory Of Elasticity ◽  
Manufacturing Cost ◽  
Coating System ◽  
Thermally Induced ◽  
Low Modulus ◽  
Induced Stresses

A polymer-coated glass fiber with a low-modulus coating at the ends is considered. The objective of the analysis is to find out if there is sufficient incentive to use such a dual coating system for lower interfacial thermally induced stresses. These are due to the different coefficients of thermal expansion (contraction) of the dissimilar materials in the trimaterial structure. The study is restricted to the evaluation of the shearing stresses only and is based on a simplified strength-of-materials model, rather than on a rigorous theory-of-elasticity method. Such a approach seems to be justified, since the most accurate predictions of the magnitude and the distribution of the induced stresses are beyond the scope of this analysis. On the basis of the calculated data, we conclude that there is a definite incentive for employing a bimaterial coating system, in which “conventional” (high modulus) polymeric material is used in the midportion of the fiber, while a low-modulus material (typically, with a higher coefficient of expansion) is applied at its ends. Such a system could be recommended, when there is a need to bring down the interfacial stresses, and the possible increase in the manufacturing cost is not viewed as an obstacle.

Mechanical characterization of optical glass fiber coated with a thin film of silver nanoparticles by nanoindentation

2014 ◽  
Vol 136 ◽  
pp. 63-66 ◽  
Author(s):  
A. Nevarez-Rascon ◽  
E. Orrantia-Borunda ◽  
J. González-Hernández ◽  
S. Flores-Gallardo ◽  
A. Hurtado-Macías
Keyword(s):  
Thin Film ◽  
Silver Nanoparticles ◽  
Glass Fiber ◽  
Mechanical Characterization ◽  
Optical Glass ◽  
Optical Glass Fiber

scholarly journals A Novel Diagnostic Test for End-Stage Sensory Failure Associated With Diabetic Foot Ulceration: Proof-of-Principle Study

2020 ◽  
pp. 193229681990025
Author(s):  
Ernst-Adolf Chantelau
Keyword(s):  
Glass Fiber ◽  
Likelihood Ratio ◽  
Diabetic Foot ◽  
Pain Perception ◽  
Rating Scale ◽  
Optical Glass ◽  
Positive Likelihood Ratio ◽  
Foot Ulceration ◽  
End Stage ◽  
Optical Glass Fiber

Background: Diabetic foot ulceration (DFU) affects only a subgroup of patients with diabetic neuropathy, that is, those with pain-insensitivity due to end-stage sensory failure. Pain perception failure develops insidiously and remains asymptomatic until first DFU. As loss of pain perception is clinically significant, timely detection is mandatory. Objectives: A novel suprathreshold pinprick pain stimulus of 512 mN force made from optical glass-fiber was explored in a prospective cross-sectional diagnostic accuracy study to detect DFU-related end-stage sensory failure. Methods: A total of 116 participants were studied (25 healthy people, 22 patients with diabetes without relevant complications, 19 patients with previous painful foot or leg injuries, and 50 patients with previous or active painless DFU [reference standard]). Palmar and plantar surfaces were stimulated in a standardized fashion. At the feet, the second and third toe skinfolds and the middle of the plantar arch were stimulated. Participants scored stimulated pricking discomfort or pain intensity 0 to 10 on a numerical rating scale. Results: At hands, intensity was rated on average 5 (1-10) [median (range)] by 114/116 participants. Per foot, participants without DFU scored 5 (1-10), while those with DFU scored 0 (0-3) ( P < .0001). At plantar toe skinfolds, the absence of pinprick pain perception detected DFU-associated sensory failure with an accuracy of 99.5% (sensitivity 99.5%, specificity 99.4%, positive likelihood ratio 248, and negative likelihood ratio 0.005). Conclusion: In this pilot study, nociceptive stimulation of a plantar toe skinfold with a 512 mN optical glass-fiber pinprick accurately identified DFU-associated end-stage sensory failure.

Effect of Zn Addition on Non-Resonant Third-Order Optical Nonlinearity of the Cu-Doped Germano-Silicate Optical Glass Fiber

2012 ◽  
Vol 12 (1) ◽  
pp. 629-634 ◽  
Author(s):  
Seongmin Ju ◽  
Pramod R. Watekar ◽  
Seongmook Jeong ◽  
Youngwoong Kim ◽  
Won-Taek Han
Keyword(s):  
Glass Fiber ◽  
Optical Glass ◽  
Optical Nonlinearity ◽  
Third Order ◽  
Zn Addition ◽  
Optical Glass Fiber

scholarly journals Optical Glass Fiber Technology

1983 ◽  
Vol 39 (5) ◽  
pp. P141-P146
Author(s):  
KENTARO MATSUYAMA
Keyword(s):  
Glass Fiber ◽  
Optical Glass ◽  
Fiber Technology ◽  
Optical Glass Fiber
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