Polarizing Microscope and Applications

A polarizing microscope is a special kind of microscope that utilizes two polarizing lens to gain inescapable visual data from the specimen. The polarizing microscope is used extensively in the field of visual mineralogy which supports such applications as geology, asbestos testing, and forensic science. Often those working in different fields will sometimes refer to the polarizing microscope by different names such as geology microscope, petrographic microscope, pol microscope, and Plm (polarized light microscope.)

The key disagreement in the middle of the polarizing microscope and a suitable aggregate microscope is the increasing of a fixed polarizer in the middle of the light source and the specimen and the increasing of an adjustable polarizer in the middle of the objective and the eyepieces. The 2nd polarizer is called the "analyzer" and usually can insert in and out on a rotating piece in the neck of the microscope. Other coarse accessories contain a rotating stage and insertable retardation plates made from gypsum or quartz.

Microscope

With these added elements, the this microscope can gain visual data from a specimen that no other microscope can. The key visual facts ready includes refractive index, birefringence, sign of elongation, pleochroism, and angle of extinction, all of which provide clues to the crystallography of the material that is being investigated.

The first uses of these kinds of microscopes over one hundred years ago was the identification of minerals in geology. In addition, the most coarse form of lab determination to test for asbestos is performed with a polarizing microscope. Because of the their capability to provide visual data, these kind of microscopes are very ordinarily used in forensic science where the identification of unknown materials is a routine part of the job. Some of the first evidence disputing the claimed age of the so-called "Shroud of Turin" was determined by determination of pigments using a polarized light microscope.

The polarizing microscope is a very versatile and considerable instrument in the identification of materials. It is a key tool in any scientific fields, and can sometimes be the best selection over more expensive technologies. For example, in routine asbestos determination the polarizing microscope was determined to be more accurate and much more cost sufficient than the other high-tech options that were first investigated, such as x-ray diffraction and scanning electron microscopy. It is a considerable tool with many applications.

Nikon's MicroscopyU has quite a bit of facts on how the polarizers and the science work to provide analytical information: http://www.microscopyu.com/articles/polarized/polarizedintro.html

Polarizing Microscope and Applications

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