Laser optical lever measurement device

Abstract

The invention discloses a laser optical lever measurement device, which belongs to the technical field of physics experiment instruments. The device includes a bottom plate, a top plate, a laser, a support leg, two mirrors, a display with scales, and a support. The support is fixedly mounted on one of the mirrors. A horizontal shaft is arranged between the laser and the support. One end of the laser is fixedly connected with the support leg, and the other end is a laser emitting end. When the support leg moves along the vertical direction, the laser can rotate around the horizontal shaft. The angle between the projection of the light emitted by the laser on the bottom plate and the projection of the mirrors on the bottom plate is an acute angle. The laser light emitted by the laser is reflected back and forth between the two mirrors to form a light path. The display is arranged at the end of the light path. The operation and reading are convenient, and the process of change in reading along with the change in length of an object can be observed. The measuring efficiency is high. The device occupies a small space, which is conducive to improving the space utilization rate of laboratories.

Description

technical field [0001] The invention belongs to the technical field of physical experiment instruments, in particular to a laser optical lever measuring device. Background technique [0002] In various scientific experiments, it is often necessary to measure small changes in length. For example, measuring the Young's modulus of materials by stretching is one of the common ones. The traditional stretching method to measure the Young's modulus of metals uses the principle of optical levers. , the small elongation of the metal wire under the action of tension is amplified by the mirror light lever, and observed through the telescope and ruler placed in the distance. [0003] However, the above-mentioned optical lever measurement method has the following disadvantages: [0004] 1. The magnification of the optical lever is too small. The magnification of the optical lever is proportional to the distance between the mirror and the scale. The greater the distance between the mirr...

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Problems solved by technology

The magnification of the optical lever is proportional to the distance between the mirror and the scale. The greater the distance between the mirror and the scale, the greater the magnification of the optical lever and the higher the measurement accuracy. However, due to the limited space of the university laboratory, the general distance is also It is one to two meters, such a steel wire with a diameter of about 0.3mm, under the action of a Newton force, the final reading change on the scale is only about half a millimeter, and the measurement accuracy is not high

[0005] 2. It is inconvenient to operate and read. The Young’s modulus measuring instrument adjusts the tension parameters and observes the scale value at different positions. The experimenter needs to move back and forth at both ends, which affects the efficiency of the experiment, and cannot observe the process of the change of the reading when the tension changes.

[0006] 3. It is difficult to adjust the telescope, and it takes a long time to adjust the telescope so that the ruler presents a clear image in the telescope, and even the time to adjust the telescope is much longer than the specific measurement time

[0007] 4. It takes up a lot of laboratory space, which is not conducive to improving the utilization efficiency of the laboratory

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