SOLUTION OF SPECIFIC PROBLEMS OF PRE-FLIGHT SERVICE AND FLIGHT SAFETY IN THE FRAMEWORK OF "FIBER-OPTIC BOARD" CONCEPT DEVELOPMENT

Abstract

Flight control systems of the aircraft are currently built based on two concepts: “Fly-by-wire” and “Fly-by-light”. In development of the latter, we have proposed a concept with the working title “Fiber-optic onboard”, distinguished by an additional layer of sensors, the target task of which is to form a database at the pre-flight preparation stage and during the flight, according to which it is possible to determine the pre-flight settings, structural integrity and quality of operation of the onboard units, so as assemblies in order to prevent emergency situations. In this case, this group of sensors is connected to the onboard fiber-optic data transmission and control network and is a source of information for the flight control system. It is necessary to note the features of this group of sensors: they are not fiber-optic sensors built into the composite structures of the fuselage, which are the subject of research by many authors and organizations, and are not sensors that exclusively determine the laws of motion of the flight trajectory control units in normal flight. In particular, the article considers addressable fiber Bragg structures for the onboard weight and balance control system, parallel end Fabry-Perot interferometers for the icing control system, parallel Fabry-Perot interferometers based on two ultrashort fiber Bragg gratings with different measuring bases for the system of abnormally high pressure and temperature control of units and assemblies, point and quasi-distributed sensor on addressable fiber Bragg structures for the system of movement speed control, absence of blockages and air ingress for working fluids in onboard pipelines. Microwave photonic technologies are used for interrogation of sensor elements..