Recently, some advanced technologies such as sensor, electronic communications, electro-optics, and materials technology etc. are impacted on increasing the capabilities of the conventional munitions. As such, smart munitions are advanced munitions that advanced technologies above mentioned are applied to the conventional munitions. The warhead of these is built in several kinds of sensors and small size electric devices. And it is required that the test method of new concept be performed for validating of survivability in harsh environments such as high vibration, shock and temperature. The electric device for test signal recording must be implemented based on system on chip and low power due to narrow and small internal space.
As a study on the internal sensor system of miniature size, this paper describes the method of implementation of the micro module for low power operation of internal pressure gauge measuring dynamic chamber pressure. This combustion pressure of propellant generated for firing projectile has characteristic that short rising time is less than 10 milliseconds and general maximum pressure is up to 100,000 psi. In first of proposed method, required performance of the internal pressure gauge are defined based on these characteristic. And then hardware such as selection of piezoelectric sensor, design of charge amplifier, recording device and software implementation methods are presented. Finally, hardware and software performances of micro module implemented by proposed method were proved to satisfy the required performance based on test results. It is expected that proposed method will be applicable development of miniature size sensor system based on low power required for test of future weapon systems such as smart munitions and rail gun.