Application of coaxial light source filter in machine vision
The success or failure of a machine vision project depends on whether it can obtain an excellent illuminated image. If the quality of the collected images is poor, it will make the following image processing work difficult, and thus coaxial light sources have emerged. The basic principle of coaxial light source is to scatter the LED light source through a diffuser plate onto a semi transparent and semi reflective mirror splitter, which reflects the light onto the object and then onto the lens. Due to the fact that the light reflected by the detected object is on the same axis as the CCD and camera, a light source in this way is called a coaxial light source.
Coaxial light sources can generate simulated parallel coaxial illumination effects, eliminating surface irregularities and reducing interference, providing alignment and surface inspection illumination for high reflective surfaces, such as metal surface scratch inspection, thin film, chip, thin film and glass, chip and silicon wafer damage inspection. Testing, glass panel surface damage, PC motherboard atlas inspection, printed board graphic inspection, etc. As an emerging technology, coaxial light sources provide more uniform illumination than traditional light sources, thus improving the accuracy and reproducibility of machine vision. They can uniformly illuminate flat and glossy surfaces, enhance engraving, indentation, or embossing features. The inherent superiority of the technology makes it promising in multiple fields. At the same time, coaxial light sources have outstanding advantages such as easy installation, flexible configuration, and portability, which are highly favored by the market.
What are the characteristics of coaxial light: diffuse, uniform, and straight up to the lens.
Coaxial light sources are mainly used to detect flat objects with high reflectivity. According to the characteristics of coaxial light, only flat surfaces can reflect light well into the lens, while light on uneven surfaces is obliquely reflected to other places, resulting in dark colors in the image. Therefore, only those uneven areas can be better highlighted, mainly used to detect bumps, scratches, cracks, and foreign objects on flat and smooth surfaces of objects. Scratch detection on surfaces such as metal, glass, film, and chips, damage detection on chips and silicon chips, Mark point positioning, and packaging barcode recognition.
The coaxial light source filter for machine vision mainly includes a semi reflective half lens (spectroscope) and an anti reflective filter (also known as an anti reflective filter or AR lens).
The main function of an anti reflection filter is to reduce or eliminate the reflected light on the surface of optical components such as plane mirrors, thereby improving the transmittance of optical components. Anti reflective filters are divided into single-sided anti reflective and double-sided anti reflective. The anti reflective bands include visible light anti reflective, infrared light anti reflective, ultraviolet light anti reflective, and can also be coated with single point anti reflective. From the perspective of usage effect, double-sided anti reflective filters have better performance than single-sided anti reflective lenses.
Inside the coaxial light source, there is also a 45 degree mounted half mirror, also known as a spectroscope or beam splitter. The emitted light first illuminates the detected object vertically through reflection. The light reflected by the object under test enters the camera vertically through semi transparent and semi reflective mirrors. This not only eliminates reflections, but also avoids camera reflections in the image. According to different requirements of coaxial light sources, different spectral ratios can be configured, such as T: R=50:50, as well as 70/30, 20/80, 80/20, etc; The spectral band of the beam is different from the working band of the LED light source, which can be 470nm, 532nm, 650nm, 850nm, and so on.
The machine vision coaxial light source filter produced by Ruicheng Optoelectronics has high-precision optical medium coating, no ghosting, high surface smoothness, no black spots or stray light in imaging, small spectral ratio error, clear imaging, and uniform brightness. It can be customized according to the needs of customers.
Coaxial light sources can generate simulated parallel coaxial illumination effects, eliminating surface irregularities and reducing interference, providing alignment and surface inspection illumination for high reflective surfaces, such as metal surface scratch inspection, thin film, chip, thin film and glass, chip and silicon wafer damage inspection. Testing, glass panel surface damage, PC motherboard atlas inspection, printed board graphic inspection, etc. As an emerging technology, coaxial light sources provide more uniform illumination than traditional light sources, thus improving the accuracy and reproducibility of machine vision. They can uniformly illuminate flat and glossy surfaces, enhance engraving, indentation, or embossing features. The inherent superiority of the technology makes it promising in multiple fields. At the same time, coaxial light sources have outstanding advantages such as easy installation, flexible configuration, and portability, which are highly favored by the market.
What are the characteristics of coaxial light: diffuse, uniform, and straight up to the lens.
Coaxial light sources are mainly used to detect flat objects with high reflectivity. According to the characteristics of coaxial light, only flat surfaces can reflect light well into the lens, while light on uneven surfaces is obliquely reflected to other places, resulting in dark colors in the image. Therefore, only those uneven areas can be better highlighted, mainly used to detect bumps, scratches, cracks, and foreign objects on flat and smooth surfaces of objects. Scratch detection on surfaces such as metal, glass, film, and chips, damage detection on chips and silicon chips, Mark point positioning, and packaging barcode recognition.
The coaxial light source filter for machine vision mainly includes a semi reflective half lens (spectroscope) and an anti reflective filter (also known as an anti reflective filter or AR lens).
The main function of an anti reflection filter is to reduce or eliminate the reflected light on the surface of optical components such as plane mirrors, thereby improving the transmittance of optical components. Anti reflective filters are divided into single-sided anti reflective and double-sided anti reflective. The anti reflective bands include visible light anti reflective, infrared light anti reflective, ultraviolet light anti reflective, and can also be coated with single point anti reflective. From the perspective of usage effect, double-sided anti reflective filters have better performance than single-sided anti reflective lenses.
Inside the coaxial light source, there is also a 45 degree mounted half mirror, also known as a spectroscope or beam splitter. The emitted light first illuminates the detected object vertically through reflection. The light reflected by the object under test enters the camera vertically through semi transparent and semi reflective mirrors. This not only eliminates reflections, but also avoids camera reflections in the image. According to different requirements of coaxial light sources, different spectral ratios can be configured, such as T: R=50:50, as well as 70/30, 20/80, 80/20, etc; The spectral band of the beam is different from the working band of the LED light source, which can be 470nm, 532nm, 650nm, 850nm, and so on.
The machine vision coaxial light source filter produced by Ruicheng Optoelectronics has high-precision optical medium coating, no ghosting, high surface smoothness, no black spots or stray light in imaging, small spectral ratio error, clear imaging, and uniform brightness. It can be customized according to the needs of customers.