Judgment principle: using the long wavelength of red light
Red light has a longer wavelength, and long-wavelength light waves are less likely to be reflected or absorbed by the surface and can be transmitted more internally. Therefore, I use the characteristics of red light to penetrate the coffee beans. When the coffee beans are moldy or worm-eaten inside, the damaged parts will block the red light because of their dark color, allowing you to quickly judge the internal quality of the coffee beans.
Please spread the coffee beans evenly on the bean tray, and then slowly increase the brightness. The stones will be irregular and completely black, while the unripe beans and broken beans will be shiny.
As the brightness is increased, the defective beans will gradually emerge. An oval bean has irregular black
Use a clip to pick out defective beans. By the way, although red light is used by manufacturers for photobiomodulation, it is called red light low-energy light therapy.
But if you are afraid of light, please wear red or yellow goggles, or use the camera of your tablet or mobile phone to look at the coffee beans instead of you.
