System for use with component of power generation apparatus

A system for use with a component of a power generation apparatus, the system comprising:

• an optical detection unit at least partially received or embedded within a bore of the power generation apparatus such that a first end of the optical detection unit is disposed proximal to the component;
• a lens arrangement disposed proximal to the component and proximal to the first end of the optical detection unit;
• a variable focal length structure spaced apart from the lens arrangement and optically coupled with the lens arrangement, the variable focal length structure having a focal plane that is adjustable;
• and
• a controller communicably coupled with the variable focal length structure and being configured to control the variable focal length structure to adjust the focal plane of the variable focal length structure such that at least one region of interest of the component is in focus,
• wherein the optical detection unit further comprises:
• a probe housing receiving the lens arrangement therein and extending from the first end of the optical detection unit toward a second end of the optical detection unit opposite the first end;
• and
• a mount disposed adjacent to the probe housing and proximal to the second end of the optical detection unit, the mount coupling the variable focal length structure on the probe housing.