Experimental device for measuring Young modulus by using single slit diffraction

Abstract

The invention relates to an experimental device for measuring Young modulus by using single slit diffraction. The experimental device comprises a transverse beam arranged on a first bracket, wherein the lower side surface of the transverse beam is hinged with a suspension beam; the lower side at one side of the suspension beam is connected with a test sample by virtue of a tension meter; the experimental device also comprises a blade bearing connected to a second bracket in an adjustable manner; a first blade and a second blade which correspond to each other are arranged in the blade bearing; a slit is formed between cutting edges of the first blade and the second blade; an ejector rod is movably connected to the transverse beam which corresponds to the upper side of a pressing rod; the ejector rod is in pressing fit with the suspension beam; and the device is provided with a laser and a white screen used for receiving laser light emitted by the laser. The experimental device disclosed by the invention has the advantages that a lever principle is adopted, the slit distance between the cutting edges of the first blade and the second blade is adjusted, tension is read on the tension meter, the variation of the slit width is obtained according to the relation between the spacing among single slit diffraction fringes and the slit width, the Young modulus is further calculated, and the small change length is measured by adopting a single slit diffraction method, so that the actual measurement accuracy is improved, and the experimental error is reduced.

Description

technical field [0001] The invention relates to the technical field of optical measuring equipment, in particular to an experimental device for measuring Young's modulus by single-slit diffraction. Background technique [0002] One of the effects caused by a force acting on an object is to deform the object under force. The deformation of an object can be divided into elastic deformation and plastic deformation. The elastic deformation of solid materials can be divided into longitudinal, shear, torsion, and bending; for elastic deformation, Young's modulus can be introduced to describe the ability of materials to resist deformation. Young's modulus is one of the important parameters that often need to be involved in the selection of materials in engineering design. Generally, it is only related to the properties and temperature of the material, and has nothing to do with the geometric shape. [0003] Optical lever method: It is a method that uses the optical principle to am...

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Problems solved by technology

[0004] The purpose of the present invention solves the problems that the existing single-slit diffraction experiment equipment has complex structure, is not easy to adjust, the stability of the experimental equipment is not good, and the measurement accuracy is not high, and a proposed method uses single-slit diffraction to measure Young's modulus experimental device

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