Conoscopic method for determination of main refractive indices and thickness of a uniaxial crystal cut out parallel to its optical axis

2009 ◽  
Vol 42 (5) ◽  
pp. 878-884 ◽  
Author(s):  
Leonas Dumitrascu ◽  
Irina Dumitrascu ◽  
Dana Ortansa Dorohoi
Keyword(s):  
Liquid Crystal ◽  
Optical Axis ◽  
Ccd Camera ◽  
Uniaxial Crystal ◽  
Refractive Indices ◽  
Anisotropic Layer ◽  
Analysis Technique ◽  
Planar Orientation ◽  
Optical Sign

This paper presents a simplified data acquisition and analysis technique for use in determining the main refractive indices and thickness of a uniaxial anisotropic layer cut out parallel to the optical axis, by processing the conoscopic interference figures obtained using a polarizing microscope equipped with a CCD camera. For negative uniaxial crystals, the equations used permit the calculation of the optical sign of the studied material so it is not necessary to insert a quartz wedge into the conoscopic beam. The technique can also be applied to the study of liquid crystal layers in a planar orientation.

Refractive index measurements and order parameter determination of the liquid crystal p-ethoxybenzilidene-p-n-butylaniline

1981 ◽  
Vol 59 (4) ◽  
pp. 515-520 ◽  
Author(s):  
P. Palffy-Muhoray ◽  
D. A. Balzarini
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Order Parameter ◽  
Orientational Order ◽  
Parameter Determination ◽  
Refractive Indices ◽  
Temperature Changes ◽  
Interferometric Technique ◽  
Anisotropic Fluids

Using a simple new interferometric technique, the ordinary and extraordinary refractive indices of the nematic liquid crystal p-ethoxybenzilidene-p-n-butylaniline have been measured separately as a function of temperature. Changes in the refractive indices have been measured with an accuracy of ±0.005% and the absolute values with an accuracy of ±0.5%. Thermal expansivity data has been obtained by utilizing a specially constructed thermometer containing the sample. By using a recently developed Clausius–Mossotti relation for anisotropic fluids, the effective molecular polarizability and hence the orientational order parameter have been obtained from refractive index and density measurements as a function of temperature.

Determination of the optical-axis orientation of a uniaxial crystal by frequency-domain interferometry

1997 ◽  
Vol 22 (12) ◽  
pp. 931 ◽  
Author(s):  
L. Zheng ◽  
O. A. Konoplev ◽  
D. D. Meyerhofer
Keyword(s):  
Frequency Domain ◽  
Optical Axis ◽  
Uniaxial Crystal ◽  
Axis Orientation

Polarimetric method for the determination of the optical axis tilt angle at boundaries of a liquid-crystal layer

2007 ◽  
Vol 103 (4) ◽  
pp. 646-650 ◽  
Author(s):  
A. A. Karetnikov ◽  
N. A. Karetnikov ◽  
A. P. Kovshik ◽  
E. I. Ryumtsev
Keyword(s):  
Liquid Crystal ◽  
Tilt Angle ◽  
Optical Axis ◽  
Crystal Layer ◽  
Liquid Crystal Layer

Photogrammetric determination of the refractive properties of liquid crystal displays

2019 ◽  
Vol 86 (6) ◽  
pp. 319-324
Author(s):  
Marcus Petz ◽  
Hanno Dierke ◽  
Rainer Tutsch
Keyword(s):  
Liquid Crystal ◽  
Measurement Uncertainty ◽  
Liquid Crystal Displays ◽  
Refractive Indices ◽  
Simultaneous Observation ◽  
Glass Substrates ◽  
Contrast Pattern ◽  
Optically Detected ◽  
First Time

AbstractIn phase-measuring deflectometry for measuring reflecting and transparent surfaces, a high-contrast pattern displayed on a liquid crystal screen is usually optically detected. One of the most important non-idealities of liquid crystal displays with regard to the achievable measurement uncertainty is the refraction in the glass substrate, which leads to an angle-dependent offset between the actual location and the observed location of a feature displayed on the screen. Owing to the typical thicknesses and refractive indices of the glass substrates used, this offset reaches several tenths of a millimeter even at moderate viewing angles. In the approach presented here, the refraction-related offset of features displayed on the screen is determined by simultaneous observation of displayed features and features mounted on the screen. The model used so far was improved, so that apart from a distance of the features to be determined before the evaluation no further previous knowledge is necessary. Within the scope of the investigations carried out, statements on the measurement uncertainty of the method could also be made and verified for the first time.

Pengaruh Kepuasan Kerja terhadap Organizational Citizenship Behavior (OCB) Alumni Diklat Kepemimpinan Tingkat IV di Provinsi Banten

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Enong Rostiawati
Keyword(s):  
Job Satisfaction ◽  
Organizational Citizenship ◽  
Organizational Citizenship Behavior ◽  
Leadership Training ◽  
Survey Methods ◽  
Citizenship Behavior ◽  
Entire Study ◽  
Analysis Technique ◽  
Study Population

Abstract: Organizational Citizenship Behavior (OCB) is a variable that can be influenced by job satisfaction. This study aims to determine the effect of job satisfaction variables on Organizational Citizenship Behavior OCB alumni level IV leadership training in Banten Province. This research uses a quantitative approach through survey methods. Data analysis technique used is simple linear regression. The population in this study were 40 respondents and the sample used was 40 respondents. Determination of the sample using total sampling techniques or samples taken from the entire study population. The results of the analysis and interpretation of research data show that the value of the regulatory coefficient of influence on job satisfaction on Organizational Citizenship Behavior (OCB) alumni of leadership training level IV is 0.740 thus it can be concluded that job satisfaction has a direct positive effect on Organizational Citizenship Behavior alumni training, meaning that improvement of satisfaction in IV level leadership training is 0.740. work has an impact on improving Organizational Citizenship Behavior for training alumni, So Organizational Citizenship Behavior for training alumni can be achieved through job satisfaction.Keywords: Job satisfaction, Organizational Citizenship Behavior, Leadership Training Alumni Level IV

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