Instrument port seal for RF measurement

摘要

A turbine engine includes a target structure (14), for example, a rotating turbine blade. A probe (24) is arranged near the target structure (14) for communicating a detection frequency relative to the target structure for gathering information such as tip clearance. A housing (16) is arranged adjacent to the target structure (14). In one example, the housing (16) is a blade outer air seal (16). The housing (16) includes a structural material that supports a window material (34). The window material (34) is arranged between the probe and the target structure (14). The window material (34) is transparent to the detection frequency permitting the detection frequency to pass through the window (34) to the target structure (14) for measurement of its position relative to the housing (16). The window material (34) prevents probe contamination and provides a seal between the cooling path and turbine gas flow path.