Results 121 to 130 of about 542 (178)
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Review of Scientific Instruments, 1950
A recording polarimeter has been constructed. The principle of operation is essentially the replacement of an operator in conventional visual polarimetry by a photoelectric servo system. A photo-multiplier tube is used which, in conjunction with a mechanical chopping system, delivers an alternating current signal proportional to the unbalance.
G B, LEVY, P, SCHWED, D, FERGUS
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A recording polarimeter has been constructed. The principle of operation is essentially the replacement of an operator in conventional visual polarimetry by a photoelectric servo system. A photo-multiplier tube is used which, in conjunction with a mechanical chopping system, delivers an alternating current signal proportional to the unbalance.
G B, LEVY, P, SCHWED, D, FERGUS
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Journal of the American Pharmaceutical Association (Scientific ed.), 1950
A technical description of a new capillary polarimeter tube and of several methods for securing cover glasses is given. The new tube has been used for precision measurements on sucrose, using a wire recorder to take data in a darkroom; for work with essential oils; and for a novel “optical titration”.
F M, GOYAN, I J, SZEKELY
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A technical description of a new capillary polarimeter tube and of several methods for securing cover glasses is given. The new tube has been used for precision measurements on sucrose, using a wire recorder to take data in a darkroom; for work with essential oils; and for a novel “optical titration”.
F M, GOYAN, I J, SZEKELY
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Interferometric imaging polarimeter
Journal of the Optical Society of America A, 2004We describe a new imaging polarimeter that is based on a modified Sagnac interferometer and allows full polarimetric description of complex random electromagnetic beams from only two images as compared with the four images needed in conventional polarimetry. The procedure is analyzed in terms of the interference laws of Fresnel and Arago, and very good
Mujat, Mircea +2 more
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International Optical Design, 2006
A polarimeter is built to be used with the SCUBA-2 camera of the James Clerk Maxwell Telescope to study polarized sub-millimeter radiations. We simulated the effect of the polarimeter on image quality and polarization measurements. © 2006 Optical Society of America.
Leclerc M. R. +5 more
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A polarimeter is built to be used with the SCUBA-2 camera of the James Clerk Maxwell Telescope to study polarized sub-millimeter radiations. We simulated the effect of the polarimeter on image quality and polarization measurements. © 2006 Optical Society of America.
Leclerc M. R. +5 more
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Review of Scientific Instruments, 1979
A servo-polarimeter utilizing a rotating plastic film as a modulator has been modified to improve stability and sensitivity. The birefringence in a sample being scanned by moving it past a slit can now be determined to better than 3×10−9.
W, Primak, E, Monahan
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A servo-polarimeter utilizing a rotating plastic film as a modulator has been modified to improve stability and sensitivity. The birefringence in a sample being scanned by moving it past a slit can now be determined to better than 3×10−9.
W, Primak, E, Monahan
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A Photoelectric Skylight Polarimeter
Applied Optics, 1966A photoelectric skylight polarimeter to measure directly the Stokes parameters for plane polarized light is described. The basic principle of the instrument consists in the simultaneous measurement of the intensity of light (in the chosen spectral region) transmitted by polarizers oriented in four specific directions.
T A, Hariharan, Z, Sekera
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Proceedings of 12th International Conference on Pattern Recognition, 2002
The natural light field has long been known to be partly linearly polarized, and it has been suggested that various objects reflect light that is polarized at a specific orientation. Although humans use polarized light, our inability to see it limits our study and understanding of its distribution in nature and of the information it carries. By placing
T. W. Cronin +2 more
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The natural light field has long been known to be partly linearly polarized, and it has been suggested that various objects reflect light that is polarized at a specific orientation. Although humans use polarized light, our inability to see it limits our study and understanding of its distribution in nature and of the information it carries. By placing
T. W. Cronin +2 more
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Journal of Scientific Instruments, 1950
The design of a photoelectric recording polarimeter using a cooled multiplier phototube and d.c. amplification is described. The extinction point of crossed Nicol prisms is recorded electronically for any desired wavelength. Continuous rotation through the extinction point is facilitated by synchronous motor drive for each wavelength.
D H Rank, John H Light, P R Yoder
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The design of a photoelectric recording polarimeter using a cooled multiplier phototube and d.c. amplification is described. The extinction point of crossed Nicol prisms is recorded electronically for any desired wavelength. Continuous rotation through the extinction point is facilitated by synchronous motor drive for each wavelength.
D H Rank, John H Light, P R Yoder
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Optics and Spectroscopy, 2014
A polarimeter for measuring complete state of polarization of light in a wide spectral range is investigated. The light beam to be analyzed propagates through a continuously rotating first-phase plate; then through a continuously rotating second-phase plate; and, passing through a stationary linear polarizer, is incident on a detector.
A. S. Gurevich +2 more
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A polarimeter for measuring complete state of polarization of light in a wide spectral range is investigated. The light beam to be analyzed propagates through a continuously rotating first-phase plate; then through a continuously rotating second-phase plate; and, passing through a stationary linear polarizer, is incident on a detector.
A. S. Gurevich +2 more
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The Extreme Polarimeter (ExPo): design of a sensitive imaging polarimeter
SPIE Proceedings, 2008The Extreme Polarimeter (ExPo) is approaching its first deployment at the 4.2 m William Herschel Telescope at La Palma. This imaging polarimeter, developed at the Astronomical Institute of Utrecht University, aims to study circumstellar material at a contrast ratio with the central star of 10-9.
Rodenhuis, M. +3 more
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