Assertion: optical turnstile | /r/Desires | infrared beams
Facets:
value: to control entry
type: PURPOSE
Source sentences:
text: Barrier-free optical turnstiles rely solely on infrared beams to detect and deter passage, while barrier optical turnstiles utilize the internal infrared technology coupled with a physical barrier to provide added security against unwanted entry.
text: Optical turnstiles operate similarly to regular mechanical turnstiles, except for the fact that they rely on infrared beams and audible/visual interfaces to control entry, as opposed to the physical restraint exhibited by mechanical turnstiles.