Tackling Nuisance Alarms
Techniques that minimize nuisance alarms
• Differential Sensors
– Signals received within the same time period in both sensor elements will
be compensated, no alarm is generated
• Temperature compensation
– For dynamic compensation of contrast variation
• Adaptive Threshold Discrimination (ATD)
– Adjusts the alarm threshold level to the background noise
• Signal shape analysis
– Rising and falling edges of temperature contrast signal must meet certain
shape criteria, otherwise no alarm is generated
• Pulse count (only available with volumetric models)
– Signal needs to exceed alarm threshold a defined number of times in
order to trigger full alarm
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