In this work, authors present a new application of electronic speckle pattern shearing interferometry (shearography) to a phenomenon known as creep compliance, which is an important mechanical property of viscoelastic materials. Two different sealing elastomers were tested in a short-term creep experiment, applying a constant tensile stress to a specimen. An experimental in-plane shearography setup was implemented to measure the in-plane creep strains produced in the tested object. In order to show the effectiveness of shearography for the assessment of this viscoelastic mechanical property, results were compared to that obtained with an equipment of Digital Image Correlation (DIC). It was demonstrated that shearography can be potentially and successfully applied to the creep analysis of these kind of materials. Finally, advantages and limitations of this measurement method are discussed.
In this paper, authors present a new application of speckle shearing interferometry (shearography) to a phenomenon known as creep compliance, which is an important mechanical property of viscoelastic materials. Two different sealing elastomers were tested in a short-term creep experiment, applying a constant tensile stress to a specimen. An experimental in-plane shearography setup was implemented to measure directly the in-plane creep strains produced in the tested object. In order to show the effectiveness of shearography for the assessment of this mechanical property, results were compared to that obtained with an equipment of Digital Image Correlation (DIC). It was demonstrated that shearography can be potentially and successfully applied to the creep analysis of these kind of materials. Finally, advantages and limitations of this measurement method are discussed.
In this paper we analyzed and calculated the deformation based on noon symmetrical temperature distributions in the
cross section of optical fiber. Deformation distortion causes the micro vibrations of the optical fibers under periodical
thermal excitation applied to one side of cylindrical surface. Calculations were made to optimize the exposure and to
minimize energy, needed for realization of this class of sensors based on vibrations. The same effect can play negative
role for the fiber-optic communication's systems. The main feature in presented work from the similar theoretical
considerations is the analysis of the non-symmetrical heating azimuthally with appropriate deformations.
T. Tulaikova, B. Goryunov, E. Vinogradov, S. Sivergin, S. Kireeva, K. Veksler, M. Koldunov, S. Dolotov, A. Nemeruk, M. Simakova, P. Dorojkin, A. Michtchenko, N. Minhuey-Mendez
The main subject of presented work is the development of the family of fiber-optic chemical sensors for admixtures detection in air or in water. The experimental results are presented in details for the sensors for NH3, H2S and RSH with the appropriate models for operation in gas and liquid media. These sensors could be used for remote control of the common pollutions in environment, or for the measurements of the admixtures in different processes in industry. The production of these sensors for the detection and measurement of the concentrations of toxic gases yields rather simple and inexpensive tools for laboratory and industrial use.
In this paper we analyzed and calculated the temperature distributions and deformation fields in the cross section of optical fiber under periodical photo thermal excitation applied to one side of cylindrical surface. This calculations were made to optimize the exposure and to minimize energy, needed for realization of this class of sensors. The main difference from other papers is the non-symmetrical heating for initiating vibrations.
New waveguide effects are considered on the basis on various variants for self-focusing of the living cells of aquatic plant by laser beam irradiation. It is studying the process of forming of the 'living multi-mode fiber-optic' into the road of laser's beam in water with motion of green living cells. Analysis gives that the wide set of different profiles of the refractive index in this 'living optical fiber' could be easy produced depending the frequency of applied lasers. Optical waveguide approach gives high sensitivity in living layer readout and control, this waveguides could be apply to environmental processing or for a cell's studying, also different medical application could be realized according described mechanism.
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