When parallel light shines on the optical fiber from the side, due to the refraction of the optical fiber, the bright and dark images between the core and cladding, and between the cladding and the air can be observed, and the horizontal and vertical images of the optical fiber can be observed by moving microscope. The objective lens focuses on the charge coupler to obtain an analog video signal, which is then converted into a digital signal by an analog-to-digital conversion circuit. The microprocessor in the welding machine processes and recognizes the image, so as to display the alignment of the core wire and the cladding directly. The electrode pre-discharge cleans the end face of the optical fiber, and the electrode discharge melts the butted end face of the optical fiber, and the optical fibers are connected by the acting force of the timely molecules.
Domestic welding machines have related patents, but I remember that the patents related to objective lens should only be owned by Nanjing Jilang, so we can clearly see the process of core alignment welding, which is quite awesome.