CN202494637U - Double-lens device for measuring liquid reflective index - Google Patents

Abstract

The utility model discloses a double-lens device for measuring liquid reflective index, relates to a measuring device of liquid reflective index and is aimed to solve the problems that the measurement of the reflective index has low precision, small scope and is complicated to operate since the liquid reflective index is measured through abbe refractometer or grazing incidence method in physical experiments at present. Provided is the double-lens device for measuring the liquid reflective index. The double-lens device for measuring the liquid reflective index comprises a sodium lamp, a micrometer eyepiece, a beam splitter and double lenses. Each simple pens on the double lenses is a plano-convex lens, and convex faces of the two plano-convex lenses are arranged opposite to each other, and the centers of the two convex faces contact with each other. The micrometer eyepiece is arranged on one side of the double lenses along an axle of the double lenses, the beam splitter is arranged between the double lenses and the micrometer eyepiece. The axle of the micrometer eyepiece and the axle of the double lenses are arranged to form an included angle of 45 degrees, the sodium lamp is arranged on one side perpendicular to the axle of the double lenses, and light beams on the sodium lamp are aligned at the center of one side of the beam splitter towards the double lenses. The double-lens device for measuring the liquid reflective index is used for measuring the liquid reflective index.

Description

A double-lens device for measuring the refractive index of liquid

technical field

The utility model relates to a measuring device for liquid refractive index.

Background technique

At present, in ordinary physics experiments in universities, the refractive index of liquids is mostly measured by Abbe refractometer or grazing incidence method. Corresponding to the wavelength; using the grazing incidence method on the spectrometer to measure, the accuracy is not high, the experimental adjustment is complicated, and the dividing line between light and dark is not easy to find, and the measurement data is inaccurate.

Utility model content

The purpose of this utility model is to solve the problems of low measurement accuracy, small measurement range and complicated operation by using Abbe refractometer or grazing incidence method to measure the refractive index of liquid in current physical experiments, and to provide a method for measuring the refractive index of liquid. dual-lens device.

The technical scheme that the utility model takes for solving the above problems is:

A double-lens device for measuring the refractive index of a liquid, which consists of a sodium lamp, a micrometer eyepiece, a beam splitter and a double lens, each single lens on the double lens is a plano-convex lens, and the convex surfaces of the two plano-convex lenses are arranged oppositely, And the centers of the two convex surfaces are in contact, the micrometer eyepiece is arranged on one side of the micrometer eyepiece along the axis of the double lens, the beam splitter is arranged between the double lens and the micrometer eyepiece, and the axis of the beam splitter and the double lens is 45° The included angle is set, the sodium lamp is set on the side perpendicular to the axis of the double lens, and the light beam on the sodium lamp is directly opposite to the center of the side of the beam splitter facing the double lens.

Compared with the prior art, the utility model has the following beneficial effects:

1. The utility model uses the principle of optical interference to measure the refractive index of the liquid through two oppositely arranged plano-convex lenses on the double lens, and the measurement accuracy is higher. The utility model can improve the contrast of Newton's ring fringes, make the phenomenon intuitive and clear, and can also measure the curvature radius of the lens while measuring the refractive index of the liquid, and increases the experimental content of equal thickness interference. 2. The utility model has the advantages of simple structure, high cost performance and convenient operation.

Description of drawings

Fig. 1 is a front view of the overall structure of the utility model.

Detailed ways

Example 1:

A double-lens device for measuring the refractive index of a liquid, which consists of a sodium lamp 1, a micrometer eyepiece 2, a beam splitter 3 and a double-lens 4, each single lens 4-1 on the double-lens 4 is a plano-convex lens, two The convex surfaces of the two plano-convex lenses are arranged oppositely, and the centers of the two convex surfaces are in contact. The micrometer eyepiece 2 is arranged on one side of the micrometer eyepiece 2 along the axis of the double lens 4, and the beam splitter 3 is arranged on the double lens 4 and the micrometer eyepiece 2. Between them, the beam splitter 3 and the axis of the double lens 4 are set at an angle of 45°, the sodium lamp 1 is set on the side perpendicular to the axis of the double lens 4, and the light beam on the sodium lamp 1 and the beam splitter 3 face the double lens The center of one side of 4 is facing. Sodium lamp 1 has a wavelength of 5893A.

The measurement process of the present utility model: place the micrometer eyepiece 2, the beam splitter 3 and the double lens 4 respectively on the two-dimensional translation base before the measurement, then place the above-mentioned base and the sodium lamp 1 on the optical shockproof platform, and use a drip tube Inject the liquid to be measured into the gap of the double lens, and measure the Newton ring fringe spacing when the gap is air and the liquid to be measured, and the refractive index of the liquid to be measured can be obtained. By observing the changes in the width of the air film and liquid film stripes, vivid Visually demonstrate the effect of refractive index changes on fringes.

Claims (1)

1. a double lens device for measuring liquid refractive index, its composition comprises sodium lamp (1), micrometer eyepiece (2), beam splitter (3) and double lens (4), it is characterized in that: described double lens ( 4) Each single lens (4-1) on the top is a plano-convex lens, the convex surfaces of the two plano-convex lenses are arranged oppositely, and the centers of the two convex surfaces are in contact, and the micrometer eyepiece (2) is arranged on the axis of the double lens (4) One side of the micrometer eyepiece (2), the beam splitter (3) is arranged between the double lens (4) and the micrometer eyepiece (2), the axis of the beam splitter (3) and the double lens (4) is 45° The angle is set, the sodium lamp (1) is set on the side perpendicular to the axis of the double lens (4), and the beam on the sodium lamp (1) is directly opposite to the center of the side of the beam splitter (3) facing the double lens (4) .

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