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refractive index method of mining

refractive index method of mining

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In case of determining the refractive index by polarizing the relative index of refraction of a mineral with respect to the immersing medium-The Canada Balsam ; or the two adjoining minerals in contact is determined. The methods commonly employed, are as (a) Central illumination or Becke-line method. (b) Oblique illumination method

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diffusion coefficient by refractive index method

Oct 25, 2016 · Refractive Index Method. Refractive index is the ratio of the velocity of wave propagation in a reference phase to that in the phase of interest. Normally, the refractive index used in diffusion measurement is taken as the ratio of the velocity of light in vacuum to the velocity of light in the relevant phase: Where, c = velocity of light in

(pdf) refractive index measurement using comparative

A method using the Talbot effect and a moire technique to measure the refractive index of transparent materials is described for a plane-parallel plate and a liquid. Experimental verification has

analysis of test method for physical model test of mining

Mar 01, 2019 · The common utilization research methods in mining engineering include theoretical analysis, mechanical modeling, similarity model test, numerical simulation, and field test. ... Using internal writing or laser to form periodic defects on the fiber to change the refractive index of the core region, when the external parameters (temperature

[pdf] measurement of the effective refractive index of a

We propose and analyse a simple method to measure simultaneously the real and imaginary parts of the effective refractive index of a turbid suspension of particles. The method is based on measurements of the angle of refraction and transmittance of a laser beam that traverses a hollow glass prism filled with a colloidal suspension. We provide a comprehensive assessment of the method

refractive index of gemstone - gemlab

The refractive index of a gemstone provides the single most important piece of information to a gemologist seeking to identify an unknown stone. It is a constant that is measurable to four significant figures (i.e. 3 decimal points) and can allow gems to be distinguished even when their

us20040253735a1 - method for measuring liquid hydrocarbons

Aug 01, 2017 · The present invention is an apparatus and method for measuring the content of water in unrefined hydrocarbons through the application of a refractive index comprising a capacitance measuring device and a density measuring device. The capacitance measuring device may be calibrated according to linear data regarding the refractive index of an emulsion of oil and water to provide output

refractometer - gemstone buzz

This method is more effective for singly refracting stones, uniaxial stones (ordinary ray direction) and high R.I. stones. Minimum Deviation Method: This method uses a table spectrometer (goniometer) and is the most accurate method of measuring the refractive index. It requires both skill and ideal conditions for the results to be accurate

glass of high refractive index for optics and optical fiber

Certain properties of the glasses are investigated, giving special consideration to the optical properties (refractive index and transmission in the far-IR range). The investigation results reveal the possibility of producing stable glasses, a few millimeters thick, using a special method of synthesis

stress and refractive index control of sio2 thin films for

Film stress and refractive index play an important role in the fabrication of suspended waveguides. SiO2 waveguides were successfully fabricated on multiple substrates including Si, Ge, and Al2O3 wafers; the waveguides were deposited using inductively coupled plasma chemical vapor deposition at 100 °C. The precursor gases were SiH4 and N2O at 1:3 and 1:9 ratios with variable flow rates

(pdf) shape and light directions from shading and

The input requirements of these method that [18] does not solve the refractive index, while [1] needs are basically different, however, the number of input im- the true refractive index as input, hence their results for re- ages are fixed for all the methods: 6, 8, 16, 24, 36, and 48

(pdf) synthesis structural and optical properties of cmc

Nanocomposites were prepared by the method of solution casting with different proportions of magnesium oxide nanoparticles (0, 1, 3, 5, 7 and 9) wt%. ... extinction coefficient, refractive index

what is optical mineralogy? - mining information

Jul 10, 2019 · The refractive index refers to the speed of light as it spreads through a mineral. In optics, this occurrence translates to a dimensionless number. The refractive index shows the extent to which the path of light bends, or is refracted when going through a mineral

refractive index of some mammalian tissues using a fiber

The index of refraction n of the many mammalian tissues is an important but somewhat neglected optical constant. Archival and oral papers have quoted the use of values of n for tissue generally ranging from 1.35 to 1.55. However, these values are frequently without experimental basis. They have arbi

standard test method for refractive index of viscous materials

1.1 This test method covers the measurement of refractive indexes, accurate to two units in the fourth decimal place, of transparent and light-colored viscous hydrocarbon liquids and melted solids that have refractive indexes in the range between 1.33 and 1.60, and at temperatures from 80 °C to 100 °C. Temperatures lower than 80 °C can be used provided that the melting point of the sample

iso - iso 489:1999 - plastics — determination of

Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet. or film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured or. opaque materials but also to anisotropic materials. The method

a new method of measuring lens refractive index - buckley

Aug 07, 2008 · There are several methods for assessing the refractive index. Measuring the lens thickness difference from centre to edge and using calculations to determine the refractive index has merit but is likely to lack accuracy, as this ignores the effect of base curve. Other methods involve measurement of lens curvature and lens power

refractive index and measurement of refractive index

Sep 17, 2019 · R = n 2 – 1 /n 2 +2 × 1/D. Where R is a specific refraction and refractivity ,Which is independent of temperature,n is the refractive index and d is the density of the liquid.. For comparison molar refraction or molar refractivity Rm is employe which is equal to the product of the specific refraction and molar mass.. I.E. Rm = n 2 – 1 /n 2 +2 × M/D The molar refraction like specific

analysis of mining-induced variation of the water table

Mar 18, 2021 · Based on the interdependence between mining, geology and ecosystems, Yang et al. studied environment types in Shennan mining area according to a fuzzy matrix coefficient method. On the other hand, remote sensing data analysis has been widely used in studies of mining-induced environments, ecology, hydrology, and landscape change in arid and

osa | on the immersion liquid evaporation method based on

Usually, the immersion liquid method uses a set of immersion liquids with different refractive indices or continuously mixes two liquids with different refractive indices, e.g., using a pumping system. Here, the phenomenon of liquid evaporation has been utilized in defining the time-dependent refractive index variation of the host liquid - refractive index database

Extinction coefficient [ i ] k = 3.9046. Created with Highcharts 5.0.14. Wavelength, µm n, k. Chart context menu. 0.5 1 1.5 0 2.5 5 7.5 10 12.5 15 RefractiveIndex.INFO Ag (Silver) Johnson and Christy 1972: n,k 0.188-1.94 µm. n k LogX LogY eV

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