A polarizing microscope is a special kind of microscope that utilizes two polarizing lens to collect obvious optic data from the specimen. The polarizing microscope is used extensively in the field of optic 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 discrepancy between the polarizing microscope and a standard aggregate microscope is the addition of a fixed polarizer between the light source and the specimen and the addition of an adjustable polarizer between the objective and the eyepieces. The 2nd polarizer is called the "analyzer" and regularly can insert in and out on a rotating piece in the neck of the microscope. Other base accessories include a rotating stage and insertable retardation plates made from gypsum or quartz.
Microscope
With these added elements, the this microscope can collect optic data from a specimen that no other microscope can. The key optic 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 base form of lab determination to test for asbestos is performed with a polarizing microscope. Because of the their quality to provide optic data, these kind of microscopes are very commonly 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 thought about by determination of pigments using a polarized light microscope.
The polarizing microscope is a very versatile and powerful instrument in the identification of materials. It is a key tool in some scientific fields, and can sometimes be the best choice over more costly technologies. For example, in routine asbestos determination the polarizing microscope was thought about to be more strict and much more cost effective than the other high-tech options that were first investigated, such as x-ray diffraction and scanning electron microscopy. It is a powerful 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 ApplicationsRelated : Picking Safety Products Finishing Products hd blu ray player
No comments:
Post a Comment