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The Principle of Polarimetry
The Principle of Polarimetry
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optical activity I: theory
optical activity I: theory
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POLARIMETER MOD.PL 1 ( OPTICS LAB)  IRAQ
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A Brief Introduciton to Optical Rotation and Polarimetry
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Introduction to the Vernier Chemical Polarimeter - Part 1 of 2 - Getting Started
Introduction to the Vernier Chemical Polarimeter - Part 1 of 2 - Getting Started
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Polarimeter - Yale CBIC
Polarimeter - Yale CBIC
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20.6.6 Outline the use of a polarimeter in distinguishing between optical isomers IB Chemistry
20.6.6 Outline the use of a polarimeter in distinguishing between optical isomers IB Chemistry
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Polarimeter Experiment
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Glory Aerosol Polarimetry Sensor (APS)
Glory Aerosol Polarimetry Sensor (APS)
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Polarimetry Chapter 2
Polarimetry Chapter 2
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IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part1
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part1
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14
04  03  2014 Practical in  SAR Polarimetry by Shashi Kumar
04 03 2014 Practical in SAR Polarimetry by Shashi Kumar
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IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 2
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 2
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Analysis of mono- and disaccharides, Polarimetry
Analysis of mono- and disaccharides, Polarimetry
::2012/12/12::
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17
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 4
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 4
::2014/02/26::
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18
03  03  2014 Advances in  SAR Polarimetry by Shashi Kumar Part 3
03 03 2014 Advances in SAR Polarimetry by Shashi Kumar Part 3
::2014/03/04::
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19
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 5
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 5
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20
03-03-2014 Advances in  SAR Polarimetry by Shashi Kumar Part 1
03-03-2014 Advances in SAR Polarimetry by Shashi Kumar Part 1
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21
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 3
IIRS EDUSAT Lecture 25 feb 2014 Basic of SAR Polarimetry by Shashi Kumar Part 3
::2014/02/26::
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22
03  03  2014 Advances in  SAR Polarimetry by Shashi Kumar Part 4
03 03 2014 Advances in SAR Polarimetry by Shashi Kumar Part 4
::2014/03/04::
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03  03  2014 Advances in  SAR Polarimetry by Shashi Kumar Part 5
03 03 2014 Advances in SAR Polarimetry by Shashi Kumar Part 5
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Polarimetric Interferometry Imagery of Toulouse
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03  03  2014 Advances in  SAR Polarimetry by Shashi Kumar Part 2
03 03 2014 Advances in SAR Polarimetry by Shashi Kumar Part 2
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Polarimetry Chapter 1
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Automatic Polarimeter SEPA-500 [English]
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Stereochemistry 22:  More About Polarimeter & Specific Rotation
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How to Pronounce Polarimetry
How to Pronounce Polarimetry
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Introduction to the Vernier Chemical Polarimeter - Part 2 of 2 - Advanced Analysis
Introduction to the Vernier Chemical Polarimeter - Part 2 of 2 - Advanced Analysis
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On the Reconstruction of Quad Pol SAR Data From Compact Polarimetry Data For Ocean Target Detection
On the Reconstruction of Quad Pol SAR Data From Compact Polarimetry Data For Ocean Target Detection
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Home made polarimeter, #2
Home made polarimeter, #2
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Kruess Polarimeter P8000
Kruess Polarimeter P8000
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Polarimeter Measurement with an Autopol from Rudolph Research Autopol
Polarimeter Measurement with an Autopol from Rudolph Research Autopol
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Analyse mit dem Polarimeter | Chemie | Analytische Chemie
Analyse mit dem Polarimeter | Chemie | Analytische Chemie
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Polarimeter, Automatic, Digital, BenchTop from Rudolph Research
Polarimeter, Automatic, Digital, BenchTop from Rudolph Research
::2012/02/10::
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38
Home made polarimeter
Home made polarimeter
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Polarimeter Technical Video: Cleaning a Rudolph Research Autopol Sample Cell
Polarimeter Technical Video: Cleaning a Rudolph Research Autopol Sample Cell
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How to Pronounce Polarimetric
How to Pronounce Polarimetric
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41
Wie man mit dem Polarimeter eine Analyse durchführt | Chemie | Analytische Chemie
Wie man mit dem Polarimeter eine Analyse durchführt | Chemie | Analytische Chemie
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ATAGO
ATAGO's Automatic Compact Polarimeter POL 1 2
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Optical Rotation of Sugars
Optical Rotation of Sugars
::2011/12/16::
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44
MCP polarimeter: Temperature control
MCP polarimeter: Temperature control
::2013/07/24::
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Home made polarimeter #3
Home made polarimeter #3
::2008/10/28::
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46
MCP polarimeter: Automatic adjustment
MCP polarimeter: Automatic adjustment
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47
Digital Polarimeter AA-10
Digital Polarimeter AA-10
::2012/06/11::
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48
NLC uv_blue polarimeter.wmv
NLC uv_blue polarimeter.wmv
::2011/07/02::
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49
POLARIMETER
POLARIMETER
::2012/05/07::
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Polarimeter
Polarimeter
::2013/05/23::
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RESULTS [51 .. 101]
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 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 are archaic and some are in current use. The most sensitive polarimeters are based on interferometers, while more conventional polarimeters are based on arrangements of polarising filters, wave plates or other devices.

Astronomical polarimetry[edit]

Light given off by a star is un-polarized, i.e. the direction of oscillation of the light wave is random. However, when the light is reflected off the atmosphere of a planet, the light waves interact with the molecules in the atmosphere and they are polarized.[4]

By analyzing the polarization in the combined light of an extrasolar planet and its star (about one part in a million), these measurements can in principle be made with very high sensitivity also on ground-based observatories, as polarimetry is not limited by the stability of the Earth's atmosphere. It is akin to transiting of a planet in front of its star.

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 an Ordinary light, the vibrations occur in all planes perpendicular to direction of propagation. When it is allowed to pass through a Nicol prism then its vibrations in all directions except the direction of axis of the prism are cut off. The light emerging out of 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 complete bright light is observed. If the second prism is rotated by an angle of 90°, the light emerging from the first prism is stopped by the second prism due to which complete dark or no light region is observed. The first prism is usually called polarizer and the second prism is called 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 measure the region of complete brightness or half-dark half bright region or complete dark region. 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.

 [\alpha]_\lambda^T = 100\alpha/l\rho\,\!

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.
  • \rho is the mass concentration of solution.

References[edit]

  1. ^ Mishchenko, M.I.; Yatskiv, Y.S.; Rosenbush, V.K.; Videen, G. (Eds.), ed. (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 Edition. ed.). 
  2. ^ Jaap Tinbergen Jaap Tinbergen (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. ^ Schmid, H. M.; Beuzit, J.-L.; Feldt, M. et al. (2006). "Search and investigation of extra-solar planets with polarimetry". Direct Imaging of Exoplanets: Science & Techniques. Proceedings of the IAU Colloquium #200 1 (C200): 165–170. Bibcode:2006dies.conf..165S. doi:10.1017/S1743921306009252. 

External links[edit]

Polariscope Computerised

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