Interference and diffraction experiment with laser pointer as light source


For some electronic products such as mobile phones, the appearance requirements are high, and defects such as stains and scratches will occur in the production.

For some electronic products such as mobile phones, the appearance requirements are high, and defects such as stains and scratches will occur in the production. In the prior art, a spot gauge (stain card) is manually used under lighting conditions to measure and compare the area, diameter, width, length, etc. of stains, scratches, etc., of mobile phone shells, lenses, displays, etc., and whether they exceed the prescribed standards. . The green laser pointer gauge (stain card) is a plastic transparent rectangular sheet, and the surface is provided with dimensional standards for points, lines, and surfaces. When comparing, place the point gauge on the stains and scratches on the surface of the product for direct measurement, and compare and determine the benignity of the product through different size benchmarks.

A high powered laser includes a pen body, a pen tip fixedly connected to one end of the pen body, a laser generator housed in the pen tip, a power switch for controlling the laser generator, and a measuring device. The measuring device includes a tick A dial and a measuring disk; the dial can be relatively rotatably connected to the pen body and accommodated in the pen tip; the peripheral wall of the dial is provided with a scale area corresponding to the size of the product defect, and the peripheral wall of the dial Exposure to the tip of the pen; the measuring disc is provided with a plurality of circular holes corresponding to the scale area of ​​the scale to transmit the laser beam generated by the laser generator; the measuring disc is fixedly connected to the scale through the rotating scale The size of the circular hole of the measuring disk located on the optical path of the laser generator can be adjusted to control the size of the light spot generated by the laser pointer.

In middle school physics teaching, light interference and diffraction are both the key content and difficult content of teaching. Existing teaching laser interference diffractometers all use helium-neon blue laser as light sources for experiments, which are not only expensive, but also unable to compare the fringes produced by two colors of light, which cannot fully meet the teaching requirements. From the high-power blue laser pointer, the temperature is the degree of inflammation of the laser beam itself. For example, you can refer to matches, cigarettes, etc. If you accidentally irradiate the human body with this type of laser, you will immediately feel a burning sensation. If you are the focus of power, the burning will be stronger, and it will hurt your skin. If exposed to the eyes, the result will be more problems. A concrete example to understand what I can do.