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Method for measuring medium refractive index

A refractive index and medium technology, applied in the field of refractive index measurement, can solve the problems of inability to measure the refractive index of mm-level samples, inability to measure the refractive index of opaque media, and very high requirements for instrument precision, achieving easy operation, high measurement accuracy, and material selection. handy effect

Inactive Publication Date: 2015-01-28
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have certain defects; the needle insertion method requires the measured medium to be relatively thick, and cannot measure the refractive index of mm-level samples; the minimum deflection angle method requires the measured sample to be a specific triangular shape; the Abbe refractometer method can only measure Refractive index within a certain range; optical interferometry not only requires very high precision of the instrument but also complicated operation; and these methods have a common disadvantage that they cannot measure the refractive index of opaque media

Method used

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  • Method for measuring medium refractive index
  • Method for measuring medium refractive index

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Using the method of the present invention, visible light is selected to measure the refractive index of a transparent K9 glass sheet with a thickness of 1 mm.

[0024] (1) Dissolve 0.3g of chalk ash in 10ml of absolute ethanol, the mass volume ratio of the chalk ash to absolute ethanol is 3g / 100ml, shake for 15min to prepare a chalk ash suspension;

[0025] (2) Spin-coat the prepared chalk dust suspension on the surface of the K9 glass sheet, and spin-coat 5 layers until the dust film can be clearly seen on the glass sheet with the naked eye to make a coated glass sheet;

[0026] (3) Put the glass sheet coated with the dust film at the focal point of the lens, make the dust film face the lens, turn on the laser, and focus the laser light on the glass sheet coated with the dust film through the lens, and you can see clearly on the dust film halo;

[0027] (4) The measured inner radius difference between adjacent halos is ;

[0028] (5) Substitute into the formula ,...

Embodiment 2

[0031] Using the method of the present invention, infrared light with a wavelength of 980nm is selected to measure the refractive index of polysilicon (gray opaque) with a thickness of 3mm. Replace the chalk dust in Example 1 with infrared fluorescent powder, and replace the organic solvent absolute ethanol with acetone, and the rest of the steps are the same. Measure the inner radius of the first halo ;Into the formula , The calculated refractive index of the measured polysilicon is 3.481.

[0032] Prior art: The refractive index of the sample is measured by an infrared interferometer to be 3.485, which is consistent with the experimental results.

[0033]

Embodiment 3

[0035] By adopting the method of the present invention, ultraviolet light with a wavelength of 320nm is selected to measure the refractive index of an opaque and ultraviolet transparent plastic sheet in the visible wave band with a thickness of 1mm. The chalk dust in Example 1 was replaced with ultraviolet-excited fluorescent powder, the organic solvent absolute ethanol was replaced with toluene, and the rest of the steps remained unchanged. The result was measured ;Into the formula , the calculated refractive index of the measured plastic sheet is 1.667.

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Abstract

A method for measuring a medium refractive index comprises the following steps that firstly, fluorescent powder is selected according to wavelengths, and the fluorescent powder and organic solvent are mixed and vibrated; secondly, the surface of a measured sample with the thickness ranging from 1 mm to 10 mm is coated with the fluorescent powder suspension liquid; thirdly, the coated sample is placed at the focus of a lens, the face coated with a thin film is made to right face the lens, a laser is turned on, laser light is focused on the to-be-measured sample coated with the thin film through the lens, and a series of concentric circle light rings can be observed on the thin film; fourthly, the internal radius of a first inner side light ring or the difference of internal radii of the adjacent light rings is recorded as d; fifthly, d is substituted into the formula seen in the specification, and then the refractive index is calculated. The refractive index of a slab medium can be measured in the near ultraviolet band, visible light band and near-infrared band through the method.

Description

technical field [0001] The invention belongs to the technical field of refractive index measurement, and relates to a method for measuring the refractive index of a medium, in particular to a non-destructive, in-situ, rapid measurement of the refractive index of a parallel plate medium that is transparent in the visible band or opaque in the visible band but transparent in the ultraviolet or infrared band. Methods. Background technique [0002] The refractive index of a medium has always been an important optical parameter. Using the principle of total reflection to measure the refractive index of a medium is a simple, convenient, fast and easy method. Existing techniques for measuring the refractive index of media mainly include pin insertion method, minimum deflection angle method, Abbe refractometer method, optical interference method, etc. These methods have certain defects; the needle insertion method requires the measured medium to be relatively thick, and cannot mea...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 肖思刘圣张景迪王鹏何军王道伟
Owner CENT SOUTH UNIV
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