Optical lever used in measuring instrument for Young's modulus of steel wire

Abstract

The invention relates to the field of physical experimental equipment, more specifically to an optical lever used in a Young's modulus experimental instrument. In order to overcome the defects of inaccuracy in measuring a vertical distance from a rear pivot point to the mirror surface of an optical lever and difficulty in leveling of the effective length of the optical lever in a Young's modulus experiment, the invention designs a novel optical lever. The novel optical lever mainly comprises an optical lever rear arm, the rear pivot point, a reflecting mirror, a level meter, an optical lever support base, a front pivot point, a rear arm locking screw, an optical lever support, a threaded hole of the optical lever support base, a scale of the optical lever rear arm, a threaded hole of the optical lever rear arm, and a smooth circular hole of the optical lever support base. In an experiment, after the optical lever rear arm is placed at a proper position in the smooth circular hole, theoptical lever rear arm is fixed by the rear arm locking screw; through the scale on the optical lever rear arm, the effective arm length of the optical lever can be accurately read; and through adjustment of the length of the rear pivot point penetrating the optical lever rear arm, and utilization of the level meter arranged on the optical lever rear arm, the optical lever rear arm can be strict adjusted to a level condition.

Description

technical field [0001] The invention relates to the field of physical experiment devices, in particular to an optical lever used in Young's modulus experiment instruments. Background technique [0002] Determining the Young's modulus of steel wire by stretching is a traditional physical experiment. In colleges and universities, most science and engineering students need to choose this experiment project. This experiment plays an important role in cultivating students' experimental skills. During the experiment, it is necessary to use an optical lever to measure the elongation of the steel wire . It can be known from the geometric relationship and the principle of light lever , where L is the effective arm length of the light lever, the effective distance is the vertical distance from the rear fulcrum of the light lever to the line connecting the two front fulcrums, D is the distance from the mirror surface of the light lever to the ruler, It is the change amount of the...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the inaccurate measurement of the vertical distance from the rear fulcrum of the optical lever to the mirror surface and the difficulty in leveling the effective length of the optical lever in the Young's modulus experiment, the present invention designs an optical lever, which can well solve this problem

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