The composition structure of the optical fiber sensor network
2021-06-07
The fiber optic sensor network has three basic components, one of which is called a single-point sensor. An optical fiber only plays the role of transmission here, and the other is called a multi-point sensor, where one optical fiber connects many sensors together so that many sensors can share the light source to realize network monitoring. Then there is the smart fiber optic sensor. The multi-point optical fiber sensor is a grating from the outside, and periodic intervals are found through ultraviolet irradiation. When an optical fiber is incident, if the wavelength of the optical fiber is exactly twice the interval, the light wave will be strongly reflected, and if the optical fiber is subjected to temperature changes or strains, the reflected wavelength will change. This kind of sensor There can be many on one fiber, and it can be used for a variety of sensing applications by connecting them. The single-point sensor is one of the three basic components of the optical fiber sensor network. An optical fiber only plays a role in transmission, and the other is called a multi-point sensor. One optical fiber connects many sensors together, and many sensors can share the light source to realize network monitoring. Then there is the smart fiber optic sensor. The multi-point optical fiber sensor is a grating from the outside, and periodic intervals are found through ultraviolet irradiation. When an optical fiber is incident, if the wavelength of the optical fiber is exactly twice the interval, then the light wave will be strongly reflected, and if the optical fiber is subjected to temperature changes or strains, the reflected wavelength will change. There can be many on a single optical fiber, and it can be used for various sensing applications by connecting them. Because the optical fiber is soft, it can be two-dimensional or three-dimensional, so the horizontal axis is the position in space, and the vertical axis is the measurement object. What problem does such a sensor network solve? It solves the problem of what happened at what location and how strong that thing is, that is, it provides two-dimensional information. This is the problem that the intelligent optical fiber sensor needs to solve. It has very prominent characteristics and requirements, including small size, high strength, good stability, and can be implanted in materials. Anti-electromagnetic interference and environmental resistance. Fiber optic sensors have been successfully applied to aircraft structure monitoring. The characteristic of A-380 and Boeing 787 is that more than half of the quantity is carbon fiber. For example, carbon fiber conforms to the resin. There are several types of defects. One is the peeling between layers. Because this material is relatively strong, it is difficult to be like aluminum alloy materials. Carry out carbonic acid testing. Therefore, the researchers studied to embed the fiber optic sensor in the composite material. Because the thickness of this material is about 125 microns, the fiber optic sensor must be a very small fiber sensor, about 50 microns in diameter. The optical fiber sensor network can be used as the diagnostic technology of the optical fiber communication network.
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