The Principle And System Of The Electrostatically Suspended Mercury Accelerometer Research

The quartz pendulum accelerometer is now widely used in the high-performance inertial navigation; it is high in precision but poor in overload ability. The mercury accelerometer has the resistance to overload but also has the disadvantages of small range as well as poor measuring stability. Facing these problems, a scheme based on the electrostatic supported mercury accelerometer is put forward. Thorough research has been conducted on the theory to verify the feasibility of the scheme. After that a system of the electrostatic supported mercury accelerometer is designed and constructed to conduct the experimental verification of its function.The electrostatic supported mercury accelerometer has combined the electrostatic support technology and the mercury accelerometer, which not only has the resistance to overload, but also has realized the controlled suspension of the mercury droplets and improved the measuring range of the mercury accelerometer. The research contents include the following aspects:1、The theory of the electrostatic supported mercury accelerometer. A scheme based on the electrostatic supported mercury accelerometer has been raised. It utilizes the electrostatic force to balance the inertia force and has realized a stable suspension of the mercury droplets under the effect of electrostatic force through closed-loop control. With the change of the contact area of droplets and plate as the judgment of balance, using the measurement of voltage to obtain corresponding acceleration information has been realized.2、Feasibility analysis of the electrostatic supported mercury accelerometer. The force of mercury droplets under the action of many physical fields has been researched through setting up the simulation model. The feasibility of this new theory has been verified by the obtained curve of relationship between acceleration and voltage. It has been proved that the electrostatic support technology could enhance the measurement range of the mercury accelerometer. The performance parameter of the accelerometer is given then. In the meanwhile, the physical parameters which have impact on the floating voltage have been researched to lower the floating voltage to 1kV, which has advanced the application prospect of the accelerometer.3、The systematic design of the electrostatic supported mercury accelerometer. A structure used to encapsulate the mercury droplets has been designed; an optical system used to detect area has been set up to detect the area of the contact surface of mercury droplets and the upper and lower polar plate. The system can also quantitatively describe the size and variation of the area.In the end, a specific experiment is conducted to test the system of the electrostatic supported mercury accelerometer. The system is confirmed to have lived up to the design target by the experimental results.