Xine Li

Research on a Novel Capacitive Pressure Sensor to Measure Chamber Pressures of Different Caliber Artilleries

The research and development on a novel capacitive pressure sensor with an elastic pressure-sensitive element are presented in this paper. As a coaxial cylinder capacitor converter, it uses a circuit cylinder as its stationary anode and the piezo gauges shell as its moveable cathode with the electrode distance of 0.5 mm. The devices principle and structure are given, and its mechanical characteristics are theoretically simulated by using the finite element software ANSYS. The read-out circuitry was developed. Various physical properties were experimentally tested. Results show that its capacitance is approximately linear to the subjected pressure. Its sensitivity is 0.0099 pF/Mpa, pressure measuring rang is 0-600 Mpa, By using the sensors shell as its elastic sensitive element, its volume is reduced and its applications are increased, thus it can be used to measure the chamber pressures of various different caliber guns. In addition, its lower cost is helpful to promoting its applications.

Implantation Dynamic Testing and Calibration Techniques

Implantation dynamic testing (or new concept dynamic testing) is the information acquisition science within severe conditions. A definition of implantation dynamic testing is presented. The implantation dynamic testing refers to a real-time live measurement of dynamic parameters of a moving object with the main part of the testing systems located within the object being tested or in the same practical environment. A set of mathematical expressions (i.e. the conditional functions) for dynamic testing is described. The main characteristics, the main substances studied and the areas of application are presented. Since the performance of testing systems in implantation dynamic testing are strongly affected by the environment forces, general calibration methods are virtually not applicable. This paper presents three layers of calibration techniques: calibrations in simulated application environments, calibrations of environment factors, and tracing calibrations of dynamic parameters (also called quasi-sigma calibration). The last one is useful in many applications.