Design Of Warehouse Anti-Theft System For Underfround

This system adopts the low frequency vibration sensor, the output signal of a positively related to the vibration amplitude of voltage, when someone make hole in underground mining, the vibration frequency caused by mining generated by vibration sensors, and make the vibration sensor has input, thus the output voltage amplitude, after the signal amplification certain multiples, the4order butterworth band-pass filter circuit filter, and then compared with a set of fixed threshold, when more than one set of voltage signal voltage the alarm signal is produced. This shows that there are man-made mining on regional security. By this time, the location of the audible and visual alarm will give an alarm,and send alarming signal. the system send and receive signals through transmission, each wireless transmitter has a fixed code which will send with the date. The receiving determines alarming position after receiving the signal, then it transmits signal to the computer, the computer display interface alarm location of yellow light above is on. At the same time Monitor indoor buzzer sounds. Vibration sensor is installed near the receiving sensor, it will enlarge the mining voice and send to the monitoring room, on duty personnel in the monitoring room will listen to the sound of the alarm position.