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
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[0022] Example 1
[0023] Using the method of the 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 0.3 g of chalk ash in 10 ml of absolute ethanol, the mass-volume ratio of the chalk ash to the absolute ethanol is 3g / 100ml, shake for 15 minutes to prepare a chalk ash suspension;
[0025] (2) Then spin-coated the prepared chalk ash suspension on the surface of K9 glass sheet, spin-coated 5 layers, until the dust film can be clearly seen on the glass sheet with the naked eye, and made a coated glass sheet;
[0026] (3) Place 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 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 difference in the inner radius of adjacent halos is measured as ;
[0028] (5) Substitute the form...
Example Embodiment
[0030] Example 2
[0031] Using the method of the present invention, infrared light with a wavelength of 980 nm is selected to measure the refractive index of polysilicon (gray opaque) with a thickness of 3 mm. The chalk ash in Example 1 was replaced with infrared phosphor, and the organic solvent absolute ethanol was replaced with acetone, and the rest of the steps were the same. Measure the inner radius of the first halo ;Into the formula , The calculated refractive index of the tested polysilicon is 3.481.
[0032] Existing technology: The refractive index of the sample measured by an infrared interferometer is 3.485, which is consistent with the experimental result.
[0033]
Example Embodiment
[0034] Example 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 a transparent plastic sheet with a thickness of 1mm in the visible band and opaque ultraviolet band. The chalk ash in Example 1 was replaced with ultraviolet excitation phosphor, the organic solvent absolute ethanol was replaced with toluene, and the remaining steps were unchanged. Results measured ;Into the formula , The calculated refractive index of the measured plastic sheet is 1.667.
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