METHOD AND APPARATUS FOR DETECTING AND RECOGNIZING IMPACT BY IMPEDANCE MEASUREMENT

摘要

PURPOSE: To detect at least one type of shock and to detect only the shock in the related format regardless of the surface state of the moment of impact by measuring the ratio of impedance change at the impact. CONSTITUTION: Layers 1 and 2 of the conductive material of a sensor 6 cover a surface 8 and are arranged in contact each other. Also, the layers 1 and 2 at each side are connected to the corresponding terminal of an electronic system 10 including one constant current generator 11 and current flows through the layers 1 and 2 and operates in conjunction with a memory 13 and an input/ output interface 15 and is supplied to a microprocessor 12. When the sensor 6 is exposed to a physical phenomenon that is different from an initial state, the change rate of impedance of the sensor 6 is calculated and the rate of impedance change is directly proportional to the derivation of the measured potential difference. Then, the derivation of the potential difference is calculated and the obtained result is compared with a derivation value related to a shock in predetermined formal of the memory 13, thus detecting only the shock in the format concerned regardless of the surface state of the moment of shock.