SYSTEM AND METHOD FOR OPTICAL MEASUREMENTS IN A ROTARY MACHINE

A system is provided with a measurement system (27) having a sensor mount (82), a light source (16), a light sensor (18), and a controller (14) coupled to the light source (16) and the light sensor (18). The controller (14) is configured to determine a clearance between a rotor (46) and a casing (48) at least partially based on an interruption of light (120) transmitted from the light source (16) to the light sensor (18).