oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 2 )

2019 ( 42 )

2018 ( 154 )

2017 ( 155 )

Custom range...

Search Results: 1 - 10 of 7468 matches for " Optical Rotation "
All listed articles are free for downloading (OA Articles)
Page 1 /7468
Display every page Item
Optical Rotatory Dispersion Measurement of D-Glucose with Fixed Polarizer Analyzer Accessory in Conventional Spectrophotometer  [PDF]
Alfons Penzkofer
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2013, DOI: 10.4236/jasmi.2013.34030
Abstract:

In the sample compartment of a conventional spectrophotometer, mounting of a polarizer before sample and an analyzer behind sample allows the determination of the optical rotatory dispersion of optical active media by measurement of the transmission ratio of crossed and parallel arranged polarizer and analyzer. A formula for the determination of the angle of rotation is derived from the transmission ratio. The arrangement is applied to determine the molar optical rotation of D-glucose in water in the wavelength range from 220 nm to 820 nm.

Influence of Magnetic Field Inhomogeneity on a Magneto-Optical Current Sensor  [PDF]
Hala J. El-Khozondar, Mathias S. Müller, Rifa J. El-Khozondar, Alexander W. Koch
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.21004
Abstract: The growth in the capacity of electric power system creates a demand for the protection of relaying systems. Optical current transducers—OCT that are mainly made up of single mode optical fibers which are subjected to Faraday rotation are used as a replacement for electromagnetic transducers due to their immunity to electromagnetic interference. However, the principal parameter in this system, the sensitivity to magnetic fields or current, depends on the Verdet constant, which is low in the case of optical fibers. However, the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we study a current sensor, which is made up of a conductor coil with a fiber inside, thus increasing sensitivity. We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor.
Resonant Faraday effect in a Fabry–Perot cavity
Krystian Sycz,Wojciech Gawlik,Jerzy Zachorowski
Optica Applicata , 2010,
Abstract: A standard approach to Faraday effect in a Fabry–Perot cavity is extended to resonant absorbing media. The analysis indicates that application of the cavity improves a magnetometric sensitivity despite the resonant absorption. The degree of this improvement depends strongly on the medium’s density and is maximal for diluted media. The best effect is expected with rarified media and/or with weak optical transitions.
Design and Development of a Low-Cost Optical Current Sensor
Joseba Zubia,Luciano Casado,Gotzon Aldabaldetreku,Alfonso Montero,Eneko Zubia,Gaizka Durana
Sensors , 2013, DOI: 10.3390/s131013584
Abstract: In this paper we demonstrate the design of a low-cost optical current sensor. The sensor principle is the Faraday rotation of a light beam through a magneto-optical material, SF2, when a magnetic field is present. The prototype has a high sensitivity and a high linearity for currents ranging from 0 up to 800 A. The error of the optical fibre sensor is smaller than 1% for electric currents over 175 A.
All-optical 2R regeneration based on self-induced polarization rotation in a single semiconductor optical amplifier
PinXiang Duan,LiGong Chen,ShangJian Zhang,XiaoLi Zhou,YongZhi Liu,Yong Liu
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0513-8
Abstract: An all-optical 2R regeneration based on self-induced polarization rotation in a single semiconductor optical amplifier is presented. A theoretical model is built up to simulate the system performance. Experiment evidence is also provided. An extinction ratio improvement of 8.3 dB is obtained at a bit-rate of 10 Gbit/s. In the BER measurements, 6 dB improvement of the power penalty is achieved, clearly demonstrating the feasibility of the proposed scheme. Our approach has a simple structure, and allows photonic integration.
差示旋光法对VC含量的测定及分析
Differential Polarimetry Measurement and Analysis of the Content of VC
 [PDF]

孙宝良, 孙文涛
Journal of Advances in Physical Chemistry (JAPC) , 2012, DOI: 10.12677/JAPC.2012.12003
Abstract:
维生素C的含量测定主要有碘量法、分光光度法、旋光法、高效液相色谱法、薄层扫描法等多种测量方法,其中碘量法测量过程较为繁琐,且不易排除辅料对维生素C复方制剂的干扰[1];而分光光度法、高效液相色谱法、薄层扫描法等对测量仪器要求较高,加大了检测成本[1]。本文应用物理学方法,借助于线性回归理论,利用维生素C在不同pH的溶液中其旋光度有显著差异,并且其差示旋光度和浓度在一定范围内呈线性关系的特点,通过差示旋光法对VC注射液的含量进行测定,同时对实验的有关影响因素进行研究分析。结果表明VC注射液在2.50 mg/ml~12.5 mg/ml范围内浓度与差示旋光度的线性关系良好,得到的相关方程为y = 0.1835x + 0.0113,相关系数r = 0.996。对比其他测量方法,该方法简单可靠,结果合理,从而达到快速、简便、准确的测定VC含量的目的,尤其适用于中小医院相关科室对药物的快速检测。
Determination of vitamin C content of the main iodometry, spectrophotometry, polarimetry, HPLC, TLC scanning method and other methods of measurement, iodometric method for the measurement process is more cumber-some and difficult to exclude excipients vitamin C compound interference; higher spectrophotometry, HPLC, TLC scan-ning method of measuring instruments, and increased testing costs. In this paper, methods of physics, by means of linear regression theory, the use of vitamin C in different pH solution in the optical rotation were significantly different, and the differential characteristics of the optical rotation and a linear relationship between concentration within a certain range, by difference show the polarimetry VC injection of content were measured at the same time to study and analyze the influencing factors of the experiment. The results show that the VC injection in 2.50 mg/ml. To 12.5 mg/ml concentra-tion and differential optical rotation of the linear relationship, the related equation y = 0.1835 x + 0.0113, the correlation coefficient r = 0.996. Compared with other measurement methods, the method is simple and reliable, the result is rea-sonable, so as to achieve fast, simple and accurate determination of the purpose of the VC content, especially for small and medium-sized hospital departments for the rapid detection of drugs.
THE USE OF POLARIZATION EFFECTS IN SEMICONDUCTOR OPTICAL AMPLIFIERS TO PERFORM ALL-OPTICAL SIGNAL PROCESSING
Kennedy,Brendan F; Surre,Frederic; Philippe,Severine; Bradley,Louise; Landais,Pascal;
Ingeniare. Revista chilena de ingeniería , 2007, DOI: 10.4067/S0718-33052007000300011
Abstract: as the need for higher and higher bandwidths in telecommunication systems continues, it is widely predicted that at some point in the future optical processing will need to be performed all-optically. several techniques have been proposed to perform such all-optical signal processing. in this paper a technique based on the nonlinear rotation in the state of polarization of an optical signal injected into a bulk semiconductor optical amplifier is discussed. an experiment to perform wavelength conversion at 2.5 gbit/s based on this effect is presented. the performance of the wavelength converter is tested in both co- and counter-propagation, and wavelength independent wavelength conversion is found in the non-inverted co-propagation setup.
Parámetros quimicofísicos de la carboximetilquitosana
Pérez Ramos,Patricia; Fernández Monaganas,Sol A; Bilbao Revoredo,Ofelia; Fajardo Ledea,Déborah; Mateo López,Lilliana;
Revista Cubana de Farmacia , 2005,
Abstract: the characterization of carboxymethylchitosan synthesized starting from chitin obtained from lobster shells, should be seen from an integral view. the results obtained by using different techniques and the making of tests, such as the determination of humidity and ashes, thermal analysis and the determination of the percentage of amino and carboxyl group, as well as the difraction of x-rays, allow to have a general assessment of the obtained product. these reports improve the databases necessary for the evolution and development of scientific research at the world level. it is proved in this paper that the thermal stability of carboxymethylchitosan synthesized extends to approximately 250oc, that the compound is amorphous, with percentages of present amino groups of 60.1 ± 3 % and pka of 5.9, whereas for the carboxyl groups 48 ± 4 % and pka of 3.2 , are reported. the specific optical rotation has an approximate value of 0,735 ± 0,007. . on the other side, the results of humidity and the ignition residuals correspond to the reported in literature.
Optical heterodyne-Zeeman modulation magnetic rotation spectroscopic technique
Yangqin Chen,Zhiyi Bi,Peipei Cai,Jingxin Ding,Rongjun Wang,Jingjing Lu,Longsheng Ma
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02886342
Abstract: Optical heterodyne detection using 500 MHz phase modulation was combined with the Zeeman modulation-magnetic rotation spectroscopy (ZM-MRS) to form a new spectroscopic technique, which effectively reduced the amplitude fluctuation from laser source and greatly improved the signal-to-noise ratio in the detection of transient molecules.
Usefulness of the fiber-optic interferometer for the investigation of the seismic rotation waves
Leszek R. JAROSZEWICZ,Zbigniew KRAJEWSKI,Roman TEISSEYRE
Optica Applicata , 2005,
Abstract: In the paper new areas of the fiber-optic Sagnac interferometer applications are discussed and proposed. Because this system detects the absolute rotation, its application is directly designed for detection of the seismic rotation waves which are rotational events existing in the seismic waves. In most cases those waves are extracted from recordings of differential seismic signals. However, all differences in responses of the seismometers cause disturbances which obscure these hidden components as it is for two antiparallel pendulum seismometers (TAPS) system. The presented device, named fiber-optic rotational seismometer (FORS), is free from this disadvantage and may be used for other rotational seismometer calibration, as well as for direct seismic rotation waves detection. The paper describes the design based on a well-known optical gyroscope configuration but with its optimization for its optimization for detection the absolute rotation, only. The obtained results have been the source of TAPS work improvement by applying the data smoothing by a spline function. Moreover, the first application of FORS for recording rotational parts existing in the seismic events has shown that they probably propagate with different velocity than classical earthquake waves.
Page 1 /7468
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.