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The sensor is triggered when the LASER beam is obstructed.
If you sense the presence of Laser beam and avoid it, you can do that. If any of the many laser beams are obstructed, it will trigger the alarm.
You can also imagine replacing the LASER beams at exact positions with your own set of beams instantly when they are obstructed with your own laser of same kind frequency and intensity (which is not easily possible)
“What is meant by beats?discuss graphical method for formation of standing waves on streched strings?”
Beats are periodic variation in intensity of sound caused by the superposition of two waves slightly differing in their frequencies. Beats are heard when the difference in frequency is less than 10. (because human ear can distinguish two sounds distinctly only if they differ in time by 0.1 sec.)
Here are some links to understand beats better through interactive animations