Research Of Measurement Of Aircraft Fuel Quantity With Magnetostrictive Sensor

Aeronautic electric equipment has been digital and intellectualized gradually. But the tendency is restrained by tradition level measuring technologies in the aircraft fuel quantity measuring system. The application of magnetostrictive technology not only solves the problem, but also heightens the precision and the reliability. Magnetostrictive liquid level sensor, a kind of instrument for measurement of liquid level, is worked out on the basis of combined use of many technologies such as magnetostriction, flotage principle, electromagnetism induction and electron-technique. The measure instrument has many specialties, such as the error is tinier, the reading is righter, the range of measure is broader, the maintenance and useness is very convenient. As compared with common liquid level sensors, this kind of sensor has a lot of special advantages for high-precise measurement of liquid level.In this paper, the principle and mechanism of the magnetostrictive displacement sensor are introduced. Basing on the measurement principle of this sensor, the interrogation pulse and the return signal processing circuits are designed. Measurement on the interval between trigger impulse and return impulse corresponds to the position of the moving magnet. The precise time interval measurement with pulse counting is designed by using DSP controller. Using the technique of filter, it minished the measure outcome error of the interference of outside signal and the misuse of apparatus.In order to decrease the influence of attitude error and the complicated configuration of the aircraft fuel tank, the author brings forward a new method which is based on the software of CATIA to calculate fuel volume. Adopting 3D solid modeling, the model of airfoil fuel tank is established. Using the output value of the fuel sensor and the method of plan cutting entity to calculate the volume of fuel.In this paper, the magnetostrictive technology is brought in the exact and real-time measurement of the remainder fule quantity, it can improve the accuracy of sensing system greatly, and it plays an importmant role in guarantee the safety of flight in the process of flight. This research can promote digital fuel measurement system and possess some practical value.