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A conoscopic interference pattern or interference figure is a pattern of birefringent colours crossed by dark bands (or isogyres), which can be produced using a geological petrographic microscope for the purposes of mineral identification and investigation of mineral optical and chemical properties.
This simple arrangement is the basis for all conoscopic devices (conoscopes). It is not straight forward however to design and manufacture lens systems that combine the following features: maximum angle of light incidence as high as possible (e.g., 80°), diameter of measuring spot up to several millimeters,
A particular light pattern on the upper lens surface of the objectives is created as a conoscopic interference pattern (or interference figure) characteristic of uniaxial and biaxial minerals, and produced with convergent polarized light. To observe the interference figure, true petrographic microscopes usually include an accessory called a ...
A petrographic microscope, which is an optical microscope fitted with cross-polarizing lenses, a conoscopic lens, and compensators (plates of anisotropic materials; gypsum plates and quartz wedges are common), for crystallographic analysis. Optical mineralogy is the study of minerals and rocks by measuring their optical properties.
Abbe in 1880 [1] designed an orthoscopic eyepiece for stereoscopic microscopes which minimized distortion. The term was also used in stereoscopy by Heine [ 2 ] [ 3 ] for the condition when the perceived depth in a stereogram is the same as that in the actual view of the scene.
Polarizing microscope operating principle Depiction of internal organs of a midge larva via birefringence and polarized light microscopy. Polarized light microscopy can mean any of a number of optical microscopy techniques involving polarized light.
In a conoscopic system, a laser beam is projected onto the surface and then the immediate reflection along the same ray-path are put through a conoscopic crystal and projected onto a CCD. The result is a diffraction pattern , that can be frequency analyzed to determine the distance to the measured surface.
An example total ion current chromatogram from an LC-MS analysis. The total ion current chromatogram (TICC) represents the summed intensity across the entire range of masses being detected at every point in the analysis. [2] [3] The range is typically several hundred mass-to-charge units or more. In complex samples, the TICC often provides ...