An optical lever measuring device

Abstract

The invention discloses an optical lever measuring device, and belongs to the physics experiment apparatus technical field; the optical lever measuring device comprises a base plate, a top plate, a laser, a leg, a first reflective mirror and a second reflective mirror arranged in parallel, a reflector, a display screen with scales and a support; the support is fixed on the first reflective mirror;a horizontal shaft is arranged between the laser and the first support; one end of the laser is fixedly connected with the leg, and the other end is a laser emission end; the reflector is fixed on acolumn vertical to the base plate; the column bottom is fixedly provided with a worm gear; the base plate is also provided with a worm engaged with the worm gear; the worm is horizontally arranged, and the worm end portion penetrates the display screen bottom; the worm penetrating end is fixedly provided with an adjusting turn button. The optical lever measuring device is convenient in operation and to read, high in measuring efficiency, small in occupation space, and the reading changing process can be observed when the object length changes, thus improving the laboratory space utilization rate.

Description

technical field [0001] The invention belongs to the technical field of physical experiment instruments, in particular to an 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 mirror an...

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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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