A fast iterative procedure to determine photoelastic characteristic parameters

Srinath, L. S.; Keshavan, S. Y.

doi:10.1016/0093-6413(78)90051-4

Cited by 14 publications

(4 citation statements)

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“…If this condition is substituted in equation (2) This implies that the orientation 0 of the stressed model is not of relevance in the expression for intensity. In particular if 26=2nn (n=O, 1,2 ,..., etc) then the value of intensity for such light paths become an absolute minimum. The above configuration corresponds to the position of the optical elements for the dark field set-up in conventional photoelastic analysis.…”

Section: The Proposed Methodsmentioning

confidence: 99%

Minimum intensity seeking positions in polariscope set‐ups

Keshavan

1984

Strain

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Conventional polariscope set-ups like the plane polariscope or the dark or bright ,field set-ups specifi' the positions of the various optical elements with respect to the polarising axes of the photoelustic model for determining the isoclinic and isochromatic parameters. I n this paper, it is shown that such specification is not necessary since, for any light path, the positions of the optical elements for an absolute minimum in intensity of the light emerging from the analyser are unique. To illustrate this, the case of a general retarder introducing a retardation 26 at an azimuth 6 with respect to the axis of the polariser is discussed and the conditions for the determination of the isoclinics and isochromatics are obtained.

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Section: The Proposed Methodsmentioning

confidence: 99%

Minimum intensity seeking positions in polariscope set‐ups

Keshavan

1984

Strain

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“…A linear polariscope with a quarter wave plate is also used to measure y. The method is known as the Reversed Tamry method [27]. In this method the analyzer is set to 7r/4 radian to af found in (148) and the quarter wave plate is placed before the Kerr media and set to 7r/4 radian to a~.…”

Section: Measurement Of Ymentioning

confidence: 99%

“…Assuming the secondary characteristic direction is known, it can also be used to measure y with the orientation of the analyzer. In this arrangement, known as the Tardy method [27], the angle between the polarizer and the first quarter wave plate is set to 7r/4 and the angle between the second quarter wave plate and the secondary characteristic direction is set to -7r/4. The Jones matrix of the system is Point/plane electrodes are often used in HV research to obtain very large electric fields with relatively low applied voltages.…”

Section: Circular Polariscopementioning

confidence: 99%

Kerr electro-optic theory and measurements of electric fields with magnitude and direction varying along the light path

Ustundag

Gung

Zahn

1998

IEEE Trans. Dielect. Electr. Insul.

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ntial equations that govern light propagation in Kerr media are derived when the apectric field direction and magnitude vary along the light path. Case studies predict Kerr optic fringe patferns for the specific case of pointlplane electrodes. We apply the characirections theory of photoelasticity to understand these fringes. We also study birefrinia with small Kerr constant, in particular transformer oil. For this case we show that ions in the characteristic parameter theory is possible, resulting in simple integral res between the characteristic parameters and the applied electric field. We use these nships to extend the ac modulation method to measure the characteristic paramall Kerr constant media. Measurements of the characteristic parameters using the I 1070-9878/98/ $3.00 0 1998 IEEE Authorized licensed use limited to: IEEE Xplore. Downloaded on April 1, 2009 at 13:19 from IEEE Xplore. Restrictions apply.Here d,(z) and d y ( z ) are the components of d(z), e,(z) and ey(z) are the components of e(.) and ezj (2) are the components of the permittivity tensor. For lossless Kerr media ~i j ( . ) are real and symmetric. Beside the fixed zyz frame it is convenient to work in the frame that rotates with the applied electric field in which the Kerr effect is expressed. This frame will be referred as the ET frame (see Figure 2)

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“…According to our experiences, the simplest method to determine the characteristic angle is the iterative method of Srinath and Keshavan [20]. And a modified Senarmont method is suitable for determining the characteristic phase .…”

Section: Measurement Of Characteristic Parametersmentioning

confidence: 99%

Characteristic Parameters of Liquid Crystal Cells and Their Measurements

Tang

Kwok

2006

J. Display Technol.

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Abstract-The concept of equivalent characteristic parameters of a liquid crystal (LC) cell is introduced together with the characteristic circle and the characteristic ellipse. They are all related to the twist angle and retardation of the LC cell. Such equivalent characteristic parameters can provide a framework for analyzing LC modes, as well as providing a means to measure LC cell parameters. A new Stokes parameter method is also introduced to measure these characteristic parameters. Thus the twist angle and retardation of the LC cell can be determined accurately.

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A fast iterative procedure to determine photoelastic characteristic parameters

Cited by 14 publications

References 1 publication

Minimum intensity seeking positions in polariscope set‐ups

Minimum intensity seeking positions in polariscope set‐ups

Kerr electro-optic theory and measurements of electric fields with magnitude and direction varying along the light path

Characteristic Parameters of Liquid Crystal Cells and Their Measurements

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