Results 241 to 250 of about 36,426 (285)

Birefringence measurement under hydrostatic pressure in twisted highly birefringent fibers

IEEE Transactions on Instrumentation and Measurement, 1995
A new method of birefringence measurement in highly birefringent fibers influenced by hydrostatic pressure conditions up to 100 MPa is presented. The birefringence measurement method is based on twist-induced effects and has never been applied before in a high-pressure environment.
T.R. Wolinski, W.J. Bock
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Polymer Relaxation Times from Birefringence Relaxation Measurements

The Journal of Chemical Physics, 1967
A theoretical description of the time dependence of induced birefringence in polymers, based on the ``pearl-necklace'' model, is presented, and relations between relaxation and frequency dependence methods are discussed. The relaxation theory is applied to the results of measurements of the longest relaxation time for the DNA from bacteriophage T2. The
D S, Thompson, S J, Gill
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Birefringence measurement using a photoelastic modulator

Applied Optics, 1979
A high frequency photoelastic modulator is used to measure birefringence. A new method for determining large retardations is described and assessed. Its application permits the measurement of the numerical birefringence without the need to evaluate the fringe order number explicitly.
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Birefringence measurement by the self-compensation method

Applied Optics, 1992
A self-compensation method for measuring the birefringence of an optical material is proposed; an accuracy of ~10−6 is obtained. Only a thin sample is needed in this method.
L, Yi, Z, Yi, S, Xiyu, S, Lianke
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Flow birefringence of microtubules and its relation to birefringence measurements in cells

Cell Motility, 1985
AbstractUnderstanding the molecular basis of mitotic movements in living cells will require correlative experiments on intact cells, cell models, purified tubulin, and perhaps other biopolymers. Birefringence is one assay that is useful in all of these experimental situations.
R, Hard, R D, Allen
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Beat-length measurement of birefringent optical fibers

Optics Letters, 1987
We present a novel technique for the measurement of the beat length of birefringent single-mode fibers based on differential attenuation induced by a metal. The proposed technique is particularly suited for the measurement of local birefringence in polished-fiber semiplates. The technique should also find application in the characterization of polished
K, Thyagarajan, M R, Ramadas, M R, Shenoy   +2 more
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Birefringence measurements in gradient-index rod lenses

Applied Optics, 1999
Stress birefringence can be found in gradient-index (GRIN) materials because they contain a variation in composition. GRIN glass fabricated by ion exchange may contain stress from two different processes. These include a size difference between the exchange and the diffusing ions and a variation in the thermal-expansion coefficient across the gradient ...
J L, Rouke, D T, Moore
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Linear magnetic birefringence measurements of Faraday materials

Physical Review B, 1991
Measured values of the linear magnetic birefringence (Cotton-Mouton) coefficients of several Faraday-active materials (${\mathrm{Tb}}^{3+}$, ${\mathrm{Ce}}^{3+}$, and ${\mathrm{Pr}}^{3+}$ rare-earth composites) are presented. These coefficients are compared with the same coefficients measured for diamagnetic materials: ZnSe, and the liquid solvents ...
, Cho, , Bush, , Mazzoni, , Davis
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Spectral-domain measurement of phase modal birefringence in highly birefringent fibers

SPIE Proceedings, 2008
We present a new method for measuring the wavelength dependence of phase modal birefringence in highly birefringent fibers. The method is based on application of a lateral pointlike force on the fiber and resolution of the spectral interference fringes.
Petr Hlubina, Dalibor Ciprian, Jana Trojková   +2 more
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Towards Automatic Measurement of Birefringence

Nature, 1967
THE measurement of optical anisotropy is more difficult in photoelastic analysis than in other fields because of the variation in the birefringence from point to point. In addition, in three dimensional “frozen” systems the relative retardation is at most a few wavelengths, frequently less than one, and a discrimination of 0.01 wavelength can produce ...
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