Polarimetry pdf

-Transverse polarimeter (TPOL) near HERA-B hall. ZEUS lecture 26th September 2005 Page 8 Polarisation at HERA •Fills from yesterday •Rise of polarisation, some tuning and rise towards the end of the fill. ZEUS lecture 26th September 2005 Page 9 Polarisation at HERA Scattering polarimeter • Thomson cross-section approximates the angular dependence • From bound electrons one must account for both coherent and incoherent scattering and photoelectric absorption dσ /dΩ=(e / mc) (cos ϑcos ϕ+sin. 2. ϕ) r. I d d r F d d = 〈 + 〉 Ω = 〈 + 〉 Ω ϑ ϕ ϕ σ ϑ ϕ ϕ σ. 2 0 incoh 2 2 0 coh cos cos Compton polarimetry has been used extensively in both fixed-target and collider environments -standard technique in storage rings since it is non-destructive àHighest precision has been achieved using electron detection, for longitudinally polarized electrons Polarization Measurement via Compton Polarimetry Compton Scatter Polarimetry 8 Paolo Soffitta The Extreme and Variable High Energy Sky Chia Laguna 19-21/09/2011 φ At 90o of angle of scattering (θ) the modulation factor is 100 % since there are not photons diffused along the electric field. X-ray polarimetry with Thomson scattering θ is the angle of scattering. Circumstellar Polarimetry IAUS 305 Introduction • Dust Interstellar Polarization Arises from - Dust grains aligned by - ISM'sMagnetic Field • ISM Polarization provides info on -Dust properties ! size, composition -B sky B component projected on the sky - It has to be taken into account 5 adapted from Ponthieu, Lagache; planck.fr B field POLARIMETER: BASIC DESIGN A polarimeter consists of a light source, two polarizing prisms or filters, a liquid cell placed between the two polarizers, an eyepiece and a protractor for measuring the angular rotation of light by the solution. Historically, polarimeters have been based on very carefully cut prisms made ofIceland Spar (calcite). Here is a polarimeter based on a Wollaston prism. We can take the signal as the difference in outputs of detectors A and B. Since they won't be exactly the same, we need to rotate the entire instrument on the telescope, or even better rotate the telescope! But that sounds pretty awkward. Polarimetry is the oldest and most widely used method constituting a nonseparation technique. It relies upon measurement of a net effect. Data from pure enantiomers are required for comparison. The technique is based on the fact that chiral molecules rotate the plane of polarization of plane polarized light.81 2. Calibrate the polarimeter with a blank sample. a. Obtain an empty polarimeter tube and fill it with solvent, to a volume specified by your lab procedure. The tube has a cross-sectional area of 2.5 cm 2, so each cm of depth contains 2.5 mL of volume. b. Place the cell into the polarimeter by snapping it into the black brackets along the front. Polarimetry Basics, Techniques & Sensors September 20, 2017 English Methods, PolSAR Radar SAR EDU Unit Description The lesson "PolSAR" deals with the nature of electromagnetic waves and polarization as basic features to describe and analyze objects on the Earth's surface. Basics of SAR polarimetry Polarimetric decomposition techniques Polarimetry is a sensitive, nondestructive technique for measuring the optical activity exhibited by inorganic and organic compounds. A compound is considered to be optically active if linearly polarized light is rotated when passing through it. A radio polarimeter comprised of a dual-polarized actively beam- formed receiving antenna array