Table 3 Comparison of number of the alarms for the violent opening
From: Alarm method of communication intelligent manhole cover based on multiple event fusion
Input signal | Number of alarm | |
|---|---|---|
The existing method | The proposed method | |
No generated alarm event of abnormal opening, Sa = 0 | ||
Single vibration | 250 | 0 |
Gap vibration | 438 | 0 |
Alarm event has been generated of abnormal opening, Sa = 0 | ||
Single vibration | 250 | 31 |
Gap vibration | 438 | 23 |