A laser measurement system for detecting at least one locked blade assembly in a gas turbine. The system includes at least one laser device for emitting a laser beam that impinges on a blade surface of each blade in a row of blade assemblies. The laser beam is also transmitted through a space between adjacent blades to impinge on corresponding internal surfaces of the gas turbine. Further, the system includes a photon detector for detecting a first time period in which first laser energy is reflected from each blade surface and a second time period in which second laser energy is reflected from each internal surface and transmitted through each space. The system also includes a controller for detecting a change in at least one second time period to indicate that a distance between consecutive blades has changed and that at least one locked blade assembly is locked.