An optical radiation detector, such as a silicon carbide photodiode ultraviolet radiation detector, is employed for real time, noninvasive monitoring and diagnosis of combustion dynamics in gas turbine engines. The SiC photodiode responds to flame ultraviolet emission, and a Fast Fourier Transform spectrum...http://www.google.com.au/patents/US5544478?utm_source=gb-gplus-sharePatent US5544478 - Optical sensing of combustion dynamics
