帮我检查下这段话中的语法错误A method for detecting the fractional topological charge FTC of a vortex beam is proposed by using a holographic phase plate Changing the phase difference between two halves of an artifi

There are no major grammatical errors in the paragraph, but some minor improvements can be made for clarity and coherence:

"A method is proposed for detecting the fractional topological charge (FTC) of a vortex beam by using a holographic phase plate. The phase difference between two halves of the artificial phase plane, which is actually a holographic phase plate, can be adjusted to observe intensity minimum visibilities of the interacting beam in a regular order. This results in the hollow center intensity shape changing from left opening, to right opening, and back to left opening.