What types of sensors are used in area or space protection systems?

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The correct choice focuses on the types of sensors commonly used in area or space protection systems, which are designed to monitor and detect unauthorized access or intrusions in a physical environment. Infrared, microwave, and ultrasonic sensors represent the most utilized technologies in such systems.

Infrared sensors function by detecting changes in heat, which allows them to sense the presence of individuals based on body heat. This makes them highly effective for security applications in controlled environments, as they can cover large areas and are sensitive to movement.

Microwave sensors operate by emitting microwave signals and measuring their reflection. When an object enters the field, it disrupts the original microwave signals, triggering an alarm. This technology is particularly advantageous because it can penetrate through obstacles like foliage or walls, providing reliable coverage in various environments.

Ultrasonic sensors emit high-frequency sound waves and detect alterations in the sound wave pattern as they reflect off objects. They are effective for outdoor and indoor applications, capable of sensing movement by detecting changes in the sound waves, making them well-suited for security applications.

The other options present different sensor types that may not be applicable or standard in security systems. For instance, while subsonic may relate to sound, it is not specifically a standard security sensor type. Similarly,

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