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1
Content available remote

Proposed Experiment with Rydberg Atoms to Study the Influence of Particle Size on Quantum Interference

100%
Gondran M., Božić M., Arsenović D., Gondran A.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
805-810
EN
We are looking for the answers to some questions which naturally arise when one starts to think about possible influence of the size of a particle on the transmission, diffraction and interference pattern behind an interference grating.
2
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A Study on Performance Effects of Standard and Stabilized He-Ne Lasers in an Interferometric Measurement System

100%
Böcekçi V.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
810-812
EN
Stabilized He-Ne lasers are commonly utilized in interferometric systems, and provide easy and accurate results. The main reason for their extensive use is their output beam's strength and stability. However, these are relatively high in cost. In interferometric measurement systems, standard He-Ne lasers can also be used. This type of lasers has a lower cost, but their output beam strength can fluctuate in time. And this in turn adversely affects the measurement performance. In this study, a standard He-Ne and a stabilized He-Ne lasers were used in the same measurement system. The measurement errors caused by the fluctuation of the output beam of the standard He-Ne laser are minimized by using a video processing technique. When the obtained results were compared with the ideal values, the relative error for the system with the stabilized He-Ne laser was recorded as 0.2%, while for the system with the standard He-Ne laser a relative error rate of 0.3% was achieved. When the results are analyzed, it is evident that in measurement systems with a standard He-Ne laser, the system performance can be boosted with a video processing technique, and that its results can achieve values closer to the performance of stabilized He-Ne lasers.
3
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Michelson Interferometer Based Displacement Measurement Using Video Processing

100%
Bocekci V., Varol H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
934-936
EN
In this study, investigation of video processing method which is a new technique for precision displacement measurement is presented. The video processing method was integrated with an interferometric system and the thermal expansion results and linear thermal expansion coefficients of a heated sample metals were compared with theoretical results. Michelson interferometer setup was used in our study due to its advantages in precision displacement information of a visual output, called interferograms. In the experimental studies, signals of interferograms containing displacement information were obtained from the measurement system. The amount of displacement in the sample metals under the temperature variation due to thermal expansion was measured with the analysis program, written in Matlab/Simulink environment, with a micrometer precision. The measured displacement amounts were compared with the results of theoretical calculations. According to the theoretical values, the relative error of the values measured with video processing based method, was found found to be 0.3%
4
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Newly Developed Systems for the Magnetostrictive Materials Strain Measurements

100%
Kuczyński K., Bieńkowski A., Salbut L., Dymny G.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
71-74
EN
Magnetostrictive effect is connected with changes of the dimension of soft magnetic materials during the process of theirs magnetization. The paper presents newly developed measuring systems for testing of the strain distribution in the magnetostrictive materials. The system uses simultaneously two measurement techniques: strain-gauge sensor for local strain measurement and grating interferometry for the global determination of strain distribution.
5
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Optimization of a Fabry-Perot Sensing Interferometer Design for an Optical Fiber Sensor of Hematocrit Level

100%
Wierzba P., Jędrzejewska-Szczerska M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
586-588
EN
Continuous measurement of the hematocrit level in blood can potentially be performed using optical fibre sensors. The Fabry-Perot interferometric sensors are a promising candidate in this application. The most important step in the design of the sensor is design of the sensing interferometer. Adequate cavity length and high interference contrast are two most important requirements in this application. The design method of the sensing interferometer presented in this paper uses a Gaussian beam approximation. In order to verify the design, an optical fibre Fabry-Perot interferometer with adjustable cavity length was built. Its performance was tested, confirming validity of the design approach.
6
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An Experimental Method for Determination of the Refractive Index of Liquid Samples Using Michelson Interferometer

100%
Abbas B., Alshikh Khalil M.
Acta Physica Polonica A
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2016
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vol. 129
|
issue 1
59-63
EN
A new experimental and theoretical method has been presented for measuring the refractive index of liquids and transparent solids. The experimental setup is based on a modified version of the Michelson interferometer employing a rotation stage. This technique allows us the determination of the refractive index of a given liquid (or a transparent sample) accurately to high precision, with an accuracy limited only by the precision in the determination of the rotation angle.
7
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Frequency Domain Optical Coherence Tomography Techniques in Eye Imaging

88%
Wojtkowski M., Kowalczyk A., Targowski P., Gorczyńska I.
Acta Physica Polonica A
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2002
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vol. 102
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issue 6
739-746
EN
This contribution presents an application of frequency-domain optical tomography to ophthalmology. Essential theoretical foundations of time-domain and frequency-domain optical tomography are presented. Images of sections through the anterior chamber, the corneo-scleral angle and fundus of the eye are reconstructed from the spectral fringes. The morphological information gained by tomograms is important for diagnosing and planning of a treatment of glaucoma.
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