Which technology is primarily used for Optical Turnstiles?

Optical turnstiles utilize infrared sensors or light beams as their primary technology for operation. These devices are designed to monitor and control the passage of individuals, often in secure environments such as office buildings, transportation hubs, or event venues.

When a person approaches an optical turnstile, they break the infrared beams that are emitted across the entryway. This interruption is detected by the system, which then grants or denies access based on the parameters set within the device. The use of infrared sensors allows for a precise and rapid method of identifying whether someone is attempting to enter, ensuring that only authorized individuals are permitted through.

In contrast, the other options do not play a role in the functioning of optical turnstiles. Magnetic fields can be part of other security technologies, but they are not employed in detecting movement at turnstiles. Ultrasonic waves are generally used for distance measurement and not for passage control. Bluetooth connectivity is more relevant for wireless communication and does not directly relate to the entry process of optical turnstiles. Thus, the reliance on infrared sensors or light beams is what makes them effective in managing access points and enhancing security.