Which technology can help enhance the reliability of alarm systems against false triggers?

The combination of active and passive technologies enhances the reliability of alarm systems against false triggers by leveraging distinct and complementary methods of detection. Active technologies typically involve systems that send out a signal, which is then reflected back or returned in some form, allowing the system to detect intrusions based on changes in that signal. For example, active systems might use motion detectors or laser beams to identify when something disrupts the signal path.

On the other hand, passive technologies rely on detecting energy emitted from the environment, such as body heat from a person or environmental noise. By integrating both active and passive technologies, alarm systems can better filter out environmental noise and disturbances that might lead to false alarms, as each system compensates for the other's weaknesses.

For instance, if a passive infrared sensor detects heat but is paired with an active technology that also verifies movement or proximity, the system can cross-reference outputs to more accurately assess whether a legitimate intrusion is occurring. This synergistic approach results in a more robust and reliable alarm system that reduces the likelihood of false triggers, thus increasing trust in the alarm system's alerts.