Turnstiles The image you have attached is of a turnstile.(USA, Canada, UK)
The purpose is to automate the entry and exit. Only one person can pass through these gates at a time so they are typically used to reinforce a one-way stream of traffic or to restrict entry to those who insert a coin, ticket or pass of some kind.
The Oxford dictionary meaning of a turnstile = a metal gate that moves round in a circle when it is pushed, and allows one person at a time to enter a place. The term 'revolving gates' cannot be used to describe it as it is a general term. While the word 'turnstile' is enough to convey what you have in mind. The other words+ revolving, gates etc are superfluous
But as they are available in various designs, they are described differently. The image shown is a Full height turnstile.
Types of turnstiles include 1. Tripod turnstile 2. Swing turnstile 3. Flap barrier turnstile 4. Full height turnstile 5. Sliding turnstile 6. Speed gate turnstile 7. Half height turnstile 8. Drom arm turnstile
Note : The terms described here are technical terms understood by majority of the manufacturers in Europe and US.