Experimental instrument for measuring Young modulus of metal wire through reflection type laser method

Abstract

The invention discloses an experimental instrument for measuring the Young modulus of a metal wire through a reflection type laser method, relating to the technical field of experimental instruments of college physics. A metal wire is hung on a metal wire hanging frame; the metal wire hanging frame is supported by a metal wire hanging frame rod and a metal wire hanging frame base; the perpendicularity of the metal wire hanging frame rod is adjusted by a metal wire hanging frame base screw; a metal wire clamping platform is fixed on the metal wire; a weight hanging frame is hung below the metal wire; a weight is placed on the weight hanging frame; the front pivot and the rear pivot of an optical lever are respectively arranged on an optical lever platform and the metal wire clamping platform; a reflector is at the front end of the optical lever; the optical lever platform is fixed on the metal wire hanging frame rod; a scaleplate is supported by a scaleplate rod and a scaleplate base; the perpendicularity of the scaleplate is adjusted through a scaleplate base screw; a laser head is installed in a laser head installation hole in the scaleplate; and the laser head is connected with a laser generator through a laser conduction optical fibre. The micro amount of the metal wire disclosed by the invention can achieve great visibility by amplifying light reflected by the optical lever on the scaleplate; and furthermore, the measurement error can be controlled within less degree.

Description

technical field [0001] The invention relates to an experimental instrument for measuring the Young's modulus of a metal wire by a reflective laser method, belonging to the technical field of university physics experimental instruments. Background technique [0002] The metal wire Young's modulus measurement experiment is a relatively classic university physics experiment. Because it involves the measurement method of tiny physical quantities and is a combination of mechanical and optical experimental methods, it is of great significance to set up this experiment. [0003] In the original metal wire Young's modulus measurement experiment instrument, the measurement of the tiny elongation of the metal wire is the method of using a mirror + adding a telescope. Because it is an observation of natural light, the visibility of the experiment is limited to a certain extent. What is more important is that the experimental accuracy is greatly restricted by the optical and mechani...

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Problems solved by technology

[0003] In the original metal wire Young's modulus measurement experiment instrument, the measurement of the tiny elongation of the metal wire is the method of using a mirror + adding a telescope. Because it is an observation of natural light, the visibility of the experiment is limited to a certain extent. What is more important is that the experimental accuracy is greatly restricted by the optical and mechanical accuracy of the telescope, so there is inevitably a large systematic error in the experiment.

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