Simulated optical fiber light guide experimental demonstrator and demonstration method

Abstract

Provided is a demonstration instrument for simulating an optical fiber light transmission experiment. A support of a semiconductor laser is arranged on a base, the base is provided with a fluid storage tank, and the fluid storage tank is composed a left fluid tank and a right fluid tank, wherein the left fluid tank is internally provided with two horizontal partition boards and is arranged at the left side of a light guide plate used for simulating an optical fiber core, the right fluid tank is arranged at the right side of the light guide plate. The two partition boards divide the interior of the left fluid tank into an upper fluid storage chamber a, a middle fluid storage chamber b and a lower fluid storage chamber c which are mutually sealed and are equal in size. The upper fluid storage chamber a is filled with water used for simulating optical fiber cladding, the middle fluid storage chamber b is filled with glycerol used for simulating the optical fiber cladding, the lower fluid storage chamber c is filled with water used for simulating optical fiber cladding. The right fluid tank is filled with water, castor oil and aviation kerosene from the bottom to top, and the water, the castor oil and the aviation kerosene are used for simulating optical fiber cladding and are equal in volume. The instrument can simulate and demonstrate a total reflection critical angle experiment, a experiment that the refractive index of the optical fiber cladding must be smaller than the refractive index of the optical core and the experiment that the refractive index of the optical fiber cladding determines optical fiber numerical apertures, and can be used for college physics, photo-communication principle lessons and experiment teaching in middle schools.

Description

technical field [0001] The invention belongs to the technical field of optical experimental instruments, and in particular relates to a demonstration experimental instrument for optical fiber light guiding. Background technique [0002] As one of the landmark achievements of high-tech, optical fiber has been widely introduced in primary and secondary school textbooks and professional courses such as physics and optical communication principles. In recent years, the experimental demonstration equipment that cooperates with the teaching materials of the principles of optics and optical communication has also been greatly developed. As we all know, optical fiber light guide is based on the principle of total reflection of light, but most of the existing optical fiber light guide demonstration experimental instruments and disclosed patented technologies only demonstrate to students that optical fiber can transmit optical signals or electrical signals from one end of the optical ...

AI Technical Summary

Problems solved by technology

First, the overall transparent cylinder structure composed of a solid glass cylinder and its surrounding filling fluids with different refractive indices allows the observer to observe the light transmission path in the solid glass cylinder from the side, but the light seen by the observer is actually It is seen through the "cylindrical lens" formed by transparent liquids with different refractive indices wrapped around a solid glass cylinder. It is well known to those skilled in the art that this will seriously deform the light and make it impossible to see the light trace clearly, so it is also It is impossible to see clearly the process of the incident angle reaching the critical angle

Impossible to achieve the desired presentation effect

Second, in the process of reflecting the transmitted light, the cylindrical surface of the solid glass cylinder will destroy the unidirectionality of the laser beam after one reflection, causing the beam to diverge obviously, and the divergent beam will pass through the "column" formed by the surrounding transparent liquid. "lens" observation, it will be blurred, unable to achieve the required demonstration effect

Third, the refractive index of the liquid used in this invention is lower than that of the glass cylinder, so it can only be used to observe the light transmission of the glass cylinder when the "cladding" refractive index is smaller than the "core" refractive index, and It is impossible to demonstrate to students that when the "cladding" refractive index is greater than the "fiber core" refractive index, the fiber cannot guide light

Fourth, the invention uses a glass cylinder as a simulated "fiber core", which cannot simultaneously immerse the glass cylinder in two liquids with different refractive indices, and simultaneously observe the refracted beams of the same laser beam in different liquids with different refraction angles. That is to say, students cannot feel the decisive effect of the "cladding" refractive index on the numerical aperture of the fiber through its intuitive comparison

It can be clearly seen from the above that although the invention structurally simulates the structural characteristics of the optical fiber, its demonstration effect is far from ideal

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