✔ 最佳答案
in fact,it's not a 癈's stuff,it'sthe measurement and interpretation of the polarization of transverse waves, most notably electromagnetic waves, such as radio waves and light. Typically polarimetry is done on electromagnetic waves that have traveled through or reflected, refracted, or diffracted from some material or object in order to characterize that object.
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 of thin films and surfaces is commonly known as ellipsometry.
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.
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).
by the way,Optically active samples, such as solutions of chiral molecules, often exhibit circular birefringence. Circular birefringence causes rotation of the polarisation of plane polarised light as it passes through the sample.
hope this can help you!
2008-10-17 15:58:29 補充：
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.
2008-10-17 15:59:07 補充：
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
2008-10-17 15:59:30 補充：
hope this can help you
2008-10-17 16:01:55 補充：
嗯,可能你需要一個中文的吧,ok,就這樣:
性质：又称偏振计。测量偏振光通过旋光性物质后的旋转角度的仪器。主要构成部分是起偏振器（如尼科尔棱镜）和检偏振器（如尼科尔棱镜）。当它们处于一定的位置时，视场的两半照度相等。如果在它们中间放置旋光性物质，则视场的两半照度发生变化，旋转检偏振器使两半照度重新相等，读出旋转角度的大小并算出被测物质的比旋度。旋光度与旋光性物质的分子结构、溶液的浓度和温度、溶剂的性质、光的波长等有关。旋光计常用于检定物质的纯度、测定溶液的浓度以及鉴别光学异构体等。旋光测糖计或糖量计是专门用于测定糖溶液浓度的一种旋光计。
