Method for realizing liquid refractive index measurement by utilizing Newton ring

Abstract

The invention relates to refractive index measurement, in particular to a method for achieving liquid refractive index measurement through Newton rings. The technical scheme is that the top of a coneis attached to the circle center of a cylinder inner side bottom face circle; the included angle between the conical side surface and the conical bottom surface is 0.1-0.2 degree; a diameter marking line is marked on a circular surface of the cone, the diameters Dm and Dk of m-level dark fringes and k-level dark fringes of the Newton rings are measured in the direction of the diameter marking line, m and k are both positive integers, k is larger than m, and the diameter difference d1 is calculated according to the formula that d1=Dk-Dm; liquid is injected into a water pipe, an ear washing ballis connected to an opening of the water pipe, the ear washing ball is gently pressed such that liquid is uniformly distributed in a gap between the cone and a bottom surface of the cylinder, the diameters Dm and Dk of m-level dark fringes and k-level dark fringes of the Newton rings are measured again along the direction of the diameter marker line 5, and the diameter difference dn=Dk-Dm is calculated; the refractive index n of the liquid is equal to d1 / dn. The Newton rings are distributed at equal intervals.

Description

technical field [0001] The present invention relates to the measurement of the refractive index, in particular of liquids. Background technique [0002] To measure the refractive index of the liquid through Newton’s ring, first measure the diameter Rm of the m-level dark stripe and the diameter Rk of the k-level dark stripe, where k>m; calculate S1=Rk 2 -Rm 2 ;Inject liquid into the gap between the spherical surface and the plane of Newton's ring by immersing in the liquid, and then measure Sn=Rk again 2 -Rm 2 ; Then the refractive index n=S1 / Sn. [0003] Problems with this method: (1) The Newton rings are sparse in the middle and densely packed at the edges, and are not equally spaced, so the interference order k cannot be too large, and the measurement accuracy cannot be improved by increasing the difference between k-m; (2) Soaking injection , affected by the surface tension of the liquid, the injection speed is slow and inconvenient to control, and bubbles are pro...

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Problems solved by technology

[0003] Problems with this method: (1) The Newton rings are sparse in the middle and densely packed at the edges, and are not equally spaced, so the interference order k cannot be too large, and the measurement accuracy cannot be improved by increasing the difference between k-m; (2) Soaking injection , affected by the surface tension of the liquid, the injection speed is slow and inconvenient to control, and bubbles are prone to appear; (3) The liquid in the gap is not easy to remove, which makes it more troublesome to measure the refractive index of another liquid

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