Final answer:
The most common interior volumetric sensor for detecting heat signatures of intruders is the Passive Infrared (PIR) sensor, used in many security systems.
Step-by-step explanation:
The sensor that detects heat signatures of intruders and is the most common interior volumetric sensor is the Passive Infrared (PIR) sensor. The PIR sensor works by detecting changes in the infrared radiation levels emitted by objects in its field of view. When a human or animal intruder enters the area, the sensor recognizes the change in infrared energy and triggers an alarm. These sensors are widely used in security systems for homes and businesses due to their reliability and cost-effectiveness. They are typically installed in corners of rooms to maximize coverage and are designed to be pet-friendly, reducing false alarms caused by small animals.
The most common interior volumetric sensor used for detecting movement within a space is the PIR motion sensor. This sensor consists of a sensor module that contains the PIR element, which is sensitive to changes in thermal energy. The PIR motion sensor is widely used in security systems to detect intruders in various indoor environments, such as homes, offices, and retail stores.