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Polarimetry
Polarimetry
Published: 2016/04/13
Channel: Fun Man FUNG
A Brief Introduciton to Optical Rotation and Polarimetry
A Brief Introduciton to Optical Rotation and Polarimetry
Published: 2013/10/21
Channel: ChemSurvival
The Principle of Polarimetry
The Principle of Polarimetry
Published: 2011/09/23
Channel: HGTCChem
Polarimeter, Polarimetry, Laurent Half-Shade Polarimeter
Polarimeter, Polarimetry, Laurent Half-Shade Polarimeter
Published: 2012/07/28
Channel: vedupro
CHMB41-Polarimeter
CHMB41-Polarimeter
Published: 2016/10/06
Channel: vanessa zhou
What is POLARIMETRY? What does POLARIMETRY mean? POLARIMETRY meaning, definition & explanation
What is POLARIMETRY? What does POLARIMETRY mean? POLARIMETRY meaning, definition & explanation
Published: 2017/02/12
Channel: The Audiopedia
Polarimeter - Wie funktioniert das?
Polarimeter - Wie funktioniert das?
Published: 2015/06/29
Channel: TheSimpleChemics
Optical activity | Stereochemistry | Organic chemistry | Khan Academy
Optical activity | Stereochemistry | Organic chemistry | Khan Academy
Published: 2015/06/28
Channel: Khan Academy Organic Chemistry
POLARIMETER MOD.PL 1 ( OPTICS LAB)  IRAQ
POLARIMETER MOD.PL 1 ( OPTICS LAB) IRAQ
Published: 2010/03/05
Channel: physicslove1
Polarimetry Lab Video
Polarimetry Lab Video
Published: 2016/05/31
Channel: Jessica Simpson
Stereochemistry 21:  The Polarimeter and (+) and (-)
Stereochemistry 21: The Polarimeter and (+) and (-)
Published: 2013/05/17
Channel: T Holbrook
How to use the polarimeter
How to use the polarimeter
Published: 2014/12/08
Channel: steven rossington
Using a Polarimeter to Measure Specific Rotation
Using a Polarimeter to Measure Specific Rotation
Published: 2017/05/16
Channel: Cormac Quigley
Polarimetry
Polarimetry
Published: 2016/10/26
Channel: Ronald Davis
Autopol V PLUS Polarimeter from Rudolph Research
Autopol V PLUS Polarimeter from Rudolph Research
Published: 2012/02/10
Channel: Rudolph Research Analytical
Polarimetry: Measuring the polarization of light from stars and systems.
Polarimetry: Measuring the polarization of light from stars and systems.
Published: 2015/01/08
Channel: Denver Astronomical Society
How a polarimeter works
How a polarimeter works
Published: 2016/02/19
Channel: Scott Milam
Polarimeter - Yale CBIC
Polarimeter - Yale CBIC
Published: 2011/12/03
Channel: Yale CBIC
Stereochemistry 22:  More About Polarimeter & Specific Rotation
Stereochemistry 22: More About Polarimeter & Specific Rotation
Published: 2013/05/17
Channel: T Holbrook
20.3 Outline the use of a polarimeter in distinguishing between optical isomers [HL IB Chemistry]
20.3 Outline the use of a polarimeter in distinguishing between optical isomers [HL IB Chemistry]
Published: 2011/04/16
Channel: Richard Thornley
EAS251 TO DETERMINE THE SPECIFIC ROTATION OF CANE SUGAR SOLUTION USING POLARIMETER
EAS251 TO DETERMINE THE SPECIFIC ROTATION OF CANE SUGAR SOLUTION USING POLARIMETER
Published: 2014/06/12
Channel: Ambalika Institute Of Management & Technology
Kruess Polarimeter P8000
Kruess Polarimeter P8000
Published: 2012/03/29
Channel: A.KRÜSS Optronic
Polarimetry Chapter 1
Polarimetry Chapter 1
Published: 2011/02/11
Channel: TheMarinewalker
Refractometer and Polarimeter
Refractometer and Polarimeter
Published: 2016/10/16
Channel: Bonz Valles
John Wessels - SAR polarimetry for flooded vegetation
John Wessels - SAR polarimetry for flooded vegetation
Published: 2014/09/09
Channel: LanduseKN
PolariMeter
PolariMeter
Published: 2015/10/25
Channel: NJPhysics
Specific rotation by using Laurent
Specific rotation by using Laurent's Half Shade Polarimeter
Published: 2017/09/03
Channel: BHARAT KHODA
Polarimeter experiments
Polarimeter experiments
Published: 2017/03/28
Channel: piyush Gupta
Polarimeter - Video Learning - WizScience.com
Polarimeter - Video Learning - WizScience.com
Published: 2015/09/10
Channel: Wiz Science™
lab project: Polarimetry
lab project: Polarimetry
Published: 2015/12/05
Channel: Shannon Becker
Polarimetry - Video Learning - WizScience.com
Polarimetry - Video Learning - WizScience.com
Published: 2015/09/29
Channel: Wiz Science™
Polarimetry
Polarimetry
Published: 2014/11/27
Channel: Anna Anna
Polarimeter
Polarimeter
Published: 2016/09/13
Channel: Chemistry Channel
Polarimeter Measurement with an Autopol from Rudolph Research Autopol
Polarimeter Measurement with an Autopol from Rudolph Research Autopol
Published: 2012/02/10
Channel: Rudolph Research Analytical
Polarimetry Meaning
Polarimetry Meaning
Published: 2015/04/30
Channel: ADictionary
Polarimetry Lab Video
Polarimetry Lab Video
Published: 2017/08/31
Channel: BYU-I CHEM 351L
Polarimetric Classification of Radar Data in ERDAS IMAGINE
Polarimetric Classification of Radar Data in ERDAS IMAGINE
Published: 2016/09/02
Channel: Hexagon Geospatial
Fabio Muleri - "Astronomical X–ray polarimetry"
Fabio Muleri - "Astronomical X–ray polarimetry"
Published: 2014/10/29
Channel: AracneTv
Video 7   Polarimetry
Video 7 Polarimetry
Published: 2013/02/14
Channel: MedChemDebrecen
Optical Isomers polarimetry
Optical Isomers polarimetry
Published: 2017/07/18
Channel: chembam editor
Exp6_Determination of the specific rotation of sugar solution
Exp6_Determination of the specific rotation of sugar solution
Published: 2013/05/12
Channel: Omar adly
◙ POLARIMETER ◙
◙ POLARIMETER ◙
Published: 2014/10/23
Channel: sexyncko
Polarimetric SAR Remote Sensing
Polarimetric SAR Remote Sensing
Published: 2016/10/20
Channel: IIRS ISRO Digital Content
PASCO Polarimeter: Introduction
PASCO Polarimeter: Introduction
Published: 2015/01/13
Channel: pascoscientific
DOLPi MECH imaging car (Polarimetric Imaging with diy Polarization Camera)
DOLPi MECH imaging car (Polarimetric Imaging with diy Polarization Camera)
Published: 2015/09/14
Channel: diyPhysics
Polarimeter Experiment
Polarimeter Experiment
Published: 2013/02/15
Channel: penguinboy3312
Habib Mazaheri - Soil moisture estimation using polarimetric Radarsat-2 data
Habib Mazaheri - Soil moisture estimation using polarimetric Radarsat-2 data
Published: 2014/09/04
Channel: LanduseKN
Polarimetry of Stars and Planetary Systems
Polarimetry of Stars and Planetary Systems
Published: 2016/04/04
Channel: Arthur Ferguson
Analysis of mono- and disaccharides, Polarimetry
Analysis of mono- and disaccharides, Polarimetry
Published: 2012/12/12
Channel: Aurele Ben
Calibrate polarimeter
Calibrate polarimeter
Published: 2016/10/30
Channel: shahid iqbal
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Synthetic aperture radar image of Death Valley colored using polarimetry.

Polarimetry is the measurement and interpretation of the polarization of transverse waves, most notably electromagnetic waves, such as radio or light waves. Typically polarimetry is done on electromagnetic waves that have traveled through or have been reflected, refracted or diffracted by some material in order to characterize that object.[1][2]

Applications[edit]

Polarimetry of thin films and surfaces is commonly known as ellipsometry.

Polarimetry is used in remote sensing applications, such as planetary science, astronomy, and weather radar.

Polarimetry can also be included in computational analysis of waves. For example, radars often consider wave polarization in post-processing to improve the characterization of the targets. In this case, polarimetry can be used to estimate the fine texture of a material, help resolve the orientation of small structures in the target, and, when circularly-polarized antennas are used, resolve the number of bounces of the received signal (the chirality of circularly polarized waves alternates with each reflection).

Equipment[edit]

A polarimeter is the basic scientific instrument used to make these measurements, although this term is rarely used to describe a polarimetry process performed by a computer, such as is done in polarimetric synthetic aperture radar.

Polarimetry can be used to measure various optical properties of a material, including linear birefringence, circular birefringence (also known as optical rotation or optical rotary dispersion), linear dichroism, circular dichroism and scattering.[3] To measure these various properties, there have been many designs of polarimeters, some archaic and some in current use. The most sensitive are based on interferometers, while more conventional polarimeters are based on arrangements of polarising filters, wave plates or other devices.

Astronomical polarimetry[edit]

Polarimetry is used in many areas of astronomy to study physical characteristics of sources including active galactic nuclei and blazars, exoplanets, gas and dust in the interstellar medium, supernovae, gamma-ray bursts, stellar rotation[4], stellar magnetic fields, debris disks and the cosmic microwave background radiation. Astronomical polarimetry observations are carried out either as imaging polarimetry, where polarization is measured as a function of position in imaging data, or spectropolarimetry, where polarization is measured as a function of wavelength of light, or broad-band aperture polarimetry.

Measuring optical rotation[edit]

Optically active samples, such as solutions of chiral molecules, often exhibit circular birefringence. Circular birefringence causes rotation of the polarization of plane polarized light as it passes through the sample.

In ordinary light, the vibrations occur in all planes perpendicular to the direction of propagation. When light passes through a Nicol prism its vibrations in all directions except the direction of axis of the prism are cut off. The light emerging from the prism is said to be plane polarised because its vibration is in one direction. If two Nicol prisms are placed with their polarization planes parallel to each other, then the light rays emerging out of the first prism will enter the second prism. As a result, no loss of light is observed. However, if the second prism is rotated by an angle of 90°, the light emerging from the first prism is stopped by the second prism and no light emerges. The first prism is usually called the polarizer and the second prism is called the analyser.

A simple polarimeter to measure this rotation consists of a long tube with flat glass ends, into which the sample is placed. At each end of the tube is a Nicol prism or other polarizer. Light is shone through the tube, and the prism at the other end, attached to an eye-piece, is rotated to arrive at the region of complete brightness or that of half-dark, half-bright or that of complete darkness. The angle of rotation is then read from a scale. The same phenomenon is observed after an angle of 180°. The specific rotation of the sample may then be calculated. Temperature can affect the rotation of light, which should be accounted for in the calculations.

where:

  • [α]λT is the specific rotation.
  • T is the temperature.
  • λ is the wavelength of light.
  • α is the angle of rotation.
  • l is the length of the polarimeter tube.
  • is the mass concentration of solution.

See also[edit]

References[edit]

  1. ^ Mishchenko, M.I.; Yatskiv, Y.S.; Rosenbush, V.K.; Videen, G., eds. (2011). Polarimetric Detection, Characterization and Remote Sensing, Proceedings of the NATO Advanced Study Institute on Special Detection Technique (Polarimetry) and Remote Sensing Yalta, Ukraine 20 September - 1 October 2010, Series: NATO Science for Peace and Security Series C: Environmental Security (1st ed.). 
  2. ^ Tinbergen, Jaap (2007). Astronomical Polarimetry. Cambridge University Press. ISBN 0-521-01858-7. 
  3. ^ V. Tuchin (2000). Tissue Optics Light Scattering Methods and Instruments for Medical Diagnosis. Society of Photo Optical. ISBN 0-8194-3459-0. 
  4. ^ Cotton, Daniel V; Bailey, Jeremy; Howarth, Ian D; Bott, Kimberly; Kedziora-Chudczer, Lucyna; Lucas, P. W; Hough, J. H (2017). "Polarization due to rotational distortion in the bright star Regulus". Nature Astronomy. doi:10.1038/s41550-017-0238-6. 

External links[edit]

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