Which motion sensor technologies are utilized in the security industry?

Motion sensor technologies play a crucial role in security systems by detecting movement and potential intrusions. The correct answer reflects the diversity of technologies utilized in the industry, which enhances the effectiveness and reliability of motion detection systems.

Dual-technology sensors combine two different detection methods, typically passive infrared (PIR) and microwave. This combination helps to reduce false alarms, as both technologies must be triggered to set off an alert, making them widely used in sophisticated security systems.

Fresnel lenses are employed in passive infrared sensors to focus the infrared energy emitted by moving objects, thereby increasing the sensor's sensitivity and range. These lenses can be integrated into various sensor types to enhance performance.

Mirror and curtain sensors use reflective surfaces to create a detection zone, often employed in commercial settings for doorways or narrow passages. These sensors provide a different approach to motion detection, suitable for specific applications.

By encompassing all these technologies, the correct answer highlights the industry's reliance on multiple options to meet various security needs, ensuring a more comprehensive and adaptable security solution. The variety in technologies allows security professionals to tailor systems based on environmental factors, the level of protection required, and specific application scenarios.