At present, sensors are popularly utilized in the industrial application fields, and moreover, for burglary, catastrophe protections, and vehicle intrusion sensing. In order to upgrade its sensitivity, an important factor is sometime neglected during designing a vibration sensor that should be operated sensibly and accurately as well. A conventional sensor is often so sensitive in response to a great noise produced by thunders or firecrackers and has a nuisance operation that may cause a lot of troubles.
In order to rectify the above mentioned shortcoming and to improve the properties of the conventional vibration sensor in the present market, the inventor of the present invention has developed a new low frequency vibration sensor through long time efforts, that is disclosed hereinafter.