Moir é fringes are an optical phenomenon first discovered by French researcher Moir é in the 18th century. Technically speaking, Moir é fringes are the visual result of interference between two lines or objects at a constant angle and frequency. When the human eye cannot distinguish between these two lines or objects, only interference patterns can be seen, and the patterns in this optical phenomenon are Moir é fringes.
Specifically, the Moir é fringe phenomenon refers to a series of alternating bright and dark stripes produced under the illumination of light when there is a small gap between two transparent media. This phenomenon is caused by the principle of light interference. When light passes through the interface between two transparent media, a portion of the light is reflected and another portion is refracted. When there is a small gap between media, reflected light and refracted light will interfere with each other. If the phase difference between two beams of light is an integer multiple of the wavelength, interference will be enhanced, forming bright fringes; If the phase difference between two beams of light is an odd multiple of the wavelength, interference will be weakened, forming dark fringes.
In industrial applications, Moir é fringe optical technology uses two sets of gratings, one main grating and one reference grating. The main grating of the contour surface is detected through the reference grating, and the contour surface shape of the object is calculated based on the pattern of the fringes. This technology quickly and accurately reveals the surface contour and curvature of an object by analyzing the phase changes of light on the surface of the object.
2、 Advantages and disadvantages
advantage
High precision: Moir é fringe optical technology can achieve high-precision measurements, especially in the field of flatness measurement, with much higher accuracy than traditional contact measurement methods.
Non contact measurement: This technology avoids direct contact with the sample, thus not causing any damage to the sample, which is particularly important for modern industries that require extremely high surface quality.
Strong adaptability: Moir é fringe optical technology is not only suitable for transparent objects, but also for opaque objects such as PCB boards, demonstrating strong adaptability.
Real time performance: Through precise sensors and intelligent algorithms, this technology can quickly capture small surface changes, providing real-time and accurate data support for quality control in the production process.
shortcoming
High equipment cost: Moir é fringe optical technology requires high-precision gratings and sensors, so its cost is relatively high.
There are requirements for the production of gratings: The production of gratings has certain limitations, such as requirements for accuracy, stability, etc., which may increase the difficulty and cost of production.
Limited measurement range: Although Moir é fringe optical technology performs well in flatness measurement, its measurement range may be limited to some extent, especially when dealing with complex shapes or large-sized objects, which may face challenges.
In summary, Moir é fringe optical technology has been widely applied in the industrial field due to its advantages of high precision, non-contact measurement, and real-time performance. However, its high equipment cost, requirements for grating production, and limited measurement range also need to be taken into account when using it.