Safety and Arming Device with MEMS Based Encryption System Driven by Electrothermal Actuator

The Safety and Arming Device (SAD) is the essential component that prevents fuze arming until specific conditions have been achieved. The core principle of safe and arm mechanism is the interruption of energy transfer, usually explosion, laser, or high-speed flyer, with a movable interrupter. In the present research, we propose the design and characterization of two kinds of MEMS based on-chip SAD, the bidirectional SAD and the rotary SAD respectively. Part I, the bidirectional SAD is the initial mode of our SAD project, which reflects the design methodology of resettable disarming process, the large travel range of slider, 0 energy consumption of motion retention, and the foray into the programmability of SAD. In this part, the width of each tooth on the slider (interrupter) corresponds to the specific decoding voltage, 13.5V and 14.8V, respectively. And a firing test has been carried out to verify feasibility of the SAD for the application in microfuze. Part II presents the upgraded mode based on Part I, the bidirectional slider has transformed into a rotary gear, the control signal has decrease from 4 signals to 2 signals, and discrimination mechanism has been realized through the trap set in the teeth of gear. In addition, to verify the feasibility of application, the endurance of random vibration has been tested.