**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 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.