Final answer:
The correct answer is option active infrared sensor. This exterior IDS sensor is also known as a line-of-sight sensor.
Step-by-step explanation:
The correct answer is option active infrared sensor. This exterior IDS sensor is also known as a line-of-sight sensor. Active infrared sensors work by emitting a beam of infrared light and detecting when an object interrupts the beam. They are commonly used in security systems to create an invisible barrier that triggers an alarm if crossed.
The correct answer is infrared sensor. This type of exterior Intrusion Detection System (IDS) sensor is known as a line-of-sight sensor. An infrared sensor operates by detecting infrared light radiating from objects in its field of view.
Essentially, anything that emits heat provides a source of infrared, thus human bodies and vehicles are easily detectable. The sensor operates by creating an invisible boundary that, when breached by an object that disturbs the infrared light, will signal an intrusion.
This technology is often employed in perimeter security systems for properties or restricted areas, alerting to the presence of intruders through the breaking of the line-of-sight.
Infrared sensors are generally used because they can precisely and reliably detect unauthorized access attempts regardless of the environmental conditions, such as darkness or fog that could impede visible light sensors. However, these sensors can be prone to false alarms due to animals or other non-threat objects interrupting the infrared beam.