On optical fiber and its application

  • Detail

Brief discussion on optical fiber and its application

Abstract: This paper analyzes optical fiber and its application in military, industry, medicine, aviation, transportation and civil

key words: optical fiber guide beam optical fiber diameter numerical aperture optical acceptance angle Untitled Document glassopticalfiberlightguide (typegofg) gofg type guide beam is a glass optical fiber element, which contains thousands to tens of thousands of single fibers. Its typical structure is a cylindrical cable bundle, both ends of the bundle are fixed into hard ends with adhesive, and the middle is a soft and bendable cable bundle. Inorganic optical fiber is made of two kinds of optical glass with different refractive index. More than a hundred of these fibers are combined, plus protective tube materials. Both ends are connecting ends made of metal materials. Optical fiber can be made into various specifications and sizes. Analysis and Research on the cost and energy consumption of plastic granulation machinery product characteristics: high visible and infrared transmission rate; Resistant to high temperature, humidity and electromagnetic waves 1 Product specification: hy ⑴ 080 interference; High precision, fast display, intuitive, stable and reliable. The production technology of optical fiber itself is reliable, but the manufacturing process of optical fiber requires high requirements. Optical fiber can be made into road, railway, traffic signs and signals; Sea and river beacon lights; Airport lighthouse; Various airport running lights; High obstacle warning lamp; Special lighting and warning devices such as flameproof and explosion-proof lamps. Optical fiber can be made into precision instruments for industrial and mining enterprises and industrial control data transmission. Thermal power plant is an indispensable component for automatic temperature measurement and flame signal measurement. The characteristics of optical fiber determine its broad application fields. Various optical conductors, optical rods and optical fiber panels made of optical fibers are widely used in industry, national defense, transportation, communications, medicine, aerospace and other fields. Optical fiber is most widely used in the field of communication, that is, optical fiber communication. Since the 1960s, optical communication has developed very rapidly due to major breakthroughs in light sources and optical fibers. As a light source, laser has strong directivity and high frequency, which is an ideal light source for optical communication; Compared with radio communication, optical frequency bandwidth can provide more communication channels and meet the requirements of high-capacity communication system. Therefore, optical fiber communication and satellite communication have become the two most active communication methods in the communication field. In medicine, optical fibers can be used for the optical elements of deep exploration endoscopes (gastroscope, angioscope, etc.) such as esophagus, rectum, bladder, uterus, stomach, etc., and surgical laser knives that directly insert into the body without cutting flesh and skin, and remove cancer tissue, that is, the laser is transmitted to the surgical site by optical fibers. In terms of lighting and light energy transmission, using optical fiber to enter a short distance can realize one light source multi-point lighting, optical cable lighting, and plastic optical fiber cable can be used to transmit sunlight as underwater and underground lighting. Because the optical fiber is soft and easy to bend, Northcote indicates that it can be made into any shape, with low power consumption, stable light quality, soft gloss and wide range of colors. It is the best lamp in the future. If combined with the utilization of solar energy, it will become the most economical and practical light source. In the future, high-rise buildings, auditoriums, hotels, hospitals, entertainment places, and even families can directly use ceilings or walls made of optical fiber, as well as color woven optical fiber calligraphy and painting. They can also be used for street lights of roads and public facilities, lighting of squares, and advertising of shop windows. In addition, it can also be used as a safety light source in places where transmission lines and electrical lighting are not suitable in flammable, explosive, humid and corrosive environments. In national defense and military affairs, optical fibers are also widely used. Optical fibers can be used to make fiber-optic periscopes, which are equipped on submarines, tanks and aircraft for reconnaissance of complex terrain or deep shielded enemy situations. In industry, laser can be transmitted for machining; Various sensors are made to measure pressure, temperature, flow, displacement, gloss, color, product defects, etc; It can also be used in factory automation, office automation, signal transmission within and between machines, photoelectric switches, photosensitive elements, etc. In addition, it can also be used for large display screens in railway stations, airports, squares, securities trading places and so on; Short distance communication and data transmission; The photocell fiber cloth and optical fiber cloth are cleverly combined to make night clothes with light at night, which not only plays a lighting role for night walkers, but also improves the observation distance of drivers, and can effectively reduce the occurrence of traffic accidents. Optical fiber will make new breakthroughs on the existing basis of communication, national defense, medical treatment, lighting and various technology transmission, and will be more widely used in various fields. When selecting the substrate of optical fiber, it is generally required that the light transmittance of the core material is high, while the refractive index of the coating material is low, and the greater the difference between the refractive index of the core material and the coating, the better. In terms of thermal performance, it is required that the thermal expansion coefficients of the two materials are similar. If the difference is large, the formed optical waveguide will produce internal stress, reducing the light transmittance and fiber strength by 10 In the operating parameters window of the software. In addition, the softening point of the two materials and the viscosity at high temperature are required to be close, otherwise, the combination of core material and coating material will be uneven, which will affect the optical conductivity of the fiber. There are many factors that affect the performance of optical fiber. The light collecting ability, light transmittance, resolution and contrast of optical fiber are the main indicators that affect the image transmission ability of optical wire. Numerical aperture is used to indicate the light collecting capacity of optical fiber and the amount of light received. The size of numerical aperture is directly related to the refractive index of optical fiber core and coating. The greater the difference between the refractive index of core and coating, the stronger the light collecting capacity. The light transmittance of optical fiber is related to the material used, numerical aperture and the geometric size of fiber, and decreases rapidly with the increase of fiber length. The clarity of the image is determined by the resolution, which is inversely proportional to the diameter of the optical waveguide, so the diameter of the optical waveguide should be as thin as possible. The main factors that affect the contrast of optical fiber are the light collecting ability, light transmission ability, resolution ability and coating thickness of the fiber. However, the coating thickness should be moderate. If the coating thickness is too thick, light will interfere with each other, and if it is too thin, light will leak. Compared with the traditional optical system, the guided beam has the characteristics of very simple structure, fine volume, large numerical aperture, high light transmission efficiency, arbitrary bending of light energy or light signal, long-distance direct transmission to any spatial position and so on. Main characteristics of single fiber

Copyright © 2011 JIN SHI