SYSTEM AND METHOD FOR ONLINE INSPECTION OF TURBINES USING AN OPTICAL TUBE WITH BROADSPECTRUM MIRRORS

摘要

An optical inspection system for nondestructive internal visual inspection and non-contact infra-red (IR) temperature monitoring of an online, operating power generation turbine. The optical inspection system includes an optical tube having a viewing port, at least one reflective mirror or a mirror array having a reflectivity spectral range from 550nm to 20µm, and capable of continuous operation at temperatures greater than 932 degrees Fahrenheit (500 degrees Celsius), and a transparent window with high transmission within the same spectral range mounted distal the viewing port. The same optical mirror array may be used to measure selectively surface temperature of metal turbine blades in the near IR range (approximately 1µm wavelength) and of thermal barrier coated turbine blades in the long IR range (approximately 10µm wavelength).