Final answer:
Glass break sensors, magnetic contact sensors, and motion sensors are all effective options for protecting a permanently secured window.
Step-by-step explanation:
The most effective sensor to protect a permanently secured window would be a glass break sensor. Glass break sensors detect the sound or vibrations caused by breaking glass and trigger an alarm. These sensors work by analyzing the acoustic frequencies associated with glass breaking and can be adjusted to differentiate between normal noises and the specific sound pattern of breaking glass.
Another option could be a magnetic contact sensor. These sensors consist of two components: one attached to the window frame and the other attached to the window pane. When the window is closed and secured, the two components are in close proximity, creating a closed circuit. If the window is opened or tampered with, the circuit is broken and an alarm is triggered.
Lastly, a motion sensor could also be used to protect a permanently secured window. Motion sensors use infrared technology to detect movement in a specific area. If someone tries to break into the secured window, the motion sensor will detect their movement and trigger an alarm.