Young's modulus of metal wire measured by Michelson interference

Abstract

The invention discloses a Young's modulus of a metal wire measured by Michelson interference and relates to the field of measuring of Young's modulus. The current Young's modulus measuring apparatus has the defects of small metal wire variation, poor measuring precision of many length parameters due to limits of the apparatus and difficulty in regulation of the apparatus. In order to overcome the defects of the current Young's modulus measuring apparatus and obtain more accurate measurement, the tiny elongation of the metal wire is measured by using a Michelson interference method disclosed by the invention. The technical scheme is as follows: one end of the metal wire is fixed at a plane mirror of a Michelson interferometer device; force is slowly applied to elongate the metal wire so that interference fringes move; and the number of the interference fringes is counted, the count variation of a tension sensor is obtained, the length of the metal wire is determined, the diameter of the metal wire is measured by using a micrometer, and then the Young's modulus of the metal wire is calculated. The Young's modulus of the metal wire measured by the Michelson interference has the advantages of accurate measurement, intuitive variation and simplicity in operation, reflects the mutual technology integration when being used for college physics experiments and improves the interests of students in conducting experiments.

Description

technical field [0001] The present invention relates to the measurement of Young's modulus, in particular the measurement of Young's modulus using Michelson interferometry. Background technique [0002] Young's modulus is a classic experiment in university physics experiments. However, due to the relatively small elongation during measurement, optical levers are generally used to enlarge, increase or decrease the number of weights, and observe the scale image in the telescope to move across a certain reticle. The number of tick marks on the line to obtain the change in wire length. [0003] Due to the small change in Young's modulus, the metal wire is clamped between the two chucks, which makes it difficult to measure the length; the distance between the light lever and the scale is generally measured with a tape measure suspended in the air, the bending of the tape measure and whether the tape measure is perpendicular to the scale, etc. All will bring measurement errors; t...

AI Technical Summary

Problems solved by technology

[0003] Due to the small change in Young's modulus, the metal wire is clamped between the two chucks, which makes it difficult to measure the length; the distance between the light lever and the scale is generally measured with a tape measure suspended in the air, the bending of the tape measure and whether the tape measure is perpendicular to the scale, etc. All will bring measurement errors; the measurement accuracy of the distance from the back foot of the light lever to the mirror is relatively low; the relative adjustment between the telescope, the plane mirror of the light lever and the scale is also relatively difficult

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