What do we call sensors that use two technologies to prevent false alarms?

The term "combined technology sensors" accurately reflects the concept of integrating two technologies to enhance the reliability of intrusion detection systems. These sensors are designed to leverage the strengths of different detection methods, which helps in reducing false alarms that might occur if only one technology were employed.

For instance, combining infrared and microwave detection can be effective, as one technology may detect motion while the other distinguishes between humans and animals. This hybrid approach provides a more robust detection capability and minimizes the likelihood of triggering false alerts from benign events or environmental factors.

In contrast, while terms like "dual-mode sensors" and "advanced detection sensors" might suggest some form of combined functionality, they do not specifically denote the integration of two distinct detection technologies aimed at reducing false alarms. "Smart intrusion sensors" generally refers to systems that utilize advanced algorithms and may include multiple functionalities, but this term does not explicitly capture the dual-technology aspect as clearly as "combined technology sensors" does.