Experimental apparatus for measuring refractive indexes of liquid and measuring method thereof

Abstract

The invention relates to an experimental apparatus for measuring refractive indexes of liquid. A luminescent device is arranged at the lower end of a cassette; a diaphragm is arranged on the cassette above the luminescent device; flat transmission glass is arranged on the upper surface of the diaphragm; flat image display glass is arranged on the upper surface of the flat transmission glass; a window is machined on the left side of the cassette, and the window is provided with a shading cover; bouffant shading paper is arranged at the upper end of the cassette; two stand columns are arranged on a base; millesimal position finder with scales is arranged at the upper ends of the two stand columns; a hand wheel is arranged at the end of the millesimal position finder; the hand wheel is connected with a lens cone of which the second lower part passes through the bouffant shading paper to penetrate into the cassette through a rotary translation switching mechanism; and a sealplate is arranged between the lens cone and the bouffant shading paper. A method for measuring the refractive indexes of liquid through the measuring device comprises the steps that: liquid to be measured forms a liquid film between the flat transmission glass and the flat image display glass; visible light passes through a clear aperture and the flat transmission glass, and the liquid film of the liquid to be measured to form a circular dart spot which takes an incidence point as the centre of a circle on a frosted surface of the flat image display glass; and the refractive indexes of the liquid to be measured are calculated.

Description

technical field [0001] The invention belongs to the technical field of using optical means, that is, using infrared light, visible light or ultraviolet light to test or analyze materials, and specifically relates to using an interference measurement method and a schlieren method to test the refractive index of a liquid. Background technique [0002] The refractive index of liquid is a parameter that must be measured in experiments such as optics, chemical engineering, and biological food, and is also an important measurement parameter in industrial and agricultural production and scientific research. At present, the measurement of liquid refractive index can be divided into two categories: geometric optics and wave optics. Although the measurement accuracy of the wave optics method is high, the cost of the required instruments is high, the operation is difficult, the measurement conditions are strict, and the scope of application is small, and the required instruments are no...

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Problems solved by technology

[0004] In the use of the Abbe refractometer, the direct measurement of the Abbe refractometer is the critical angle, and the measurement of the critical angle must have a process, that is, by adjusting the refraction angle, find out the angle corresponding to the critical light in the field of view, so this instrument is not real-time Measuring instruments; in addition, in the Abbe refractometer, the optical device is two optical prisms, the structure is complex, and the cost of the instrument is high; secondly, the direct measurement quantity in the Abbe refractometer is the angle, relative to the linear distance measurement, the angle measurement is complicated and the accuracy is also low. Difficult to improve

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