Infrared thermography measure the surface temperature of a nozzle without contact. Condition monitoring of jet engine machinery or any component of a jet engine has become challenging and important task for the identification of different running conditions. An aircraft’s overall noise signature can be categorized into three major components: aerodynamics air frame sound, engine noise as well as aircraft systems sound. Sound of jet is a main cause from the aircraft predominantly when take-off as well as landing. Since

aircraft climbs to cruise elevation, the exhaust states may turn out to be under expanded. Although higher bypass relation in turbo fan engines are significantly calm down than turbojets and additional decrease in noise is still attractive also will turn into compulsory in the future. The noise generation is related with sudden changes in air pressure; such situations are commonly found in and around aircraft turbojet engines where changes in pressure and temperature are required for the generation of thrust. Significant components

of engine noise are generated by the compressor and turbine. At present two major resources of noise in profitable aircraft engines from fan, compressor in the form of jet noise. Jet noise includes turbulent combination noise also it is extremely complicated to manage, Therefore its containment remains confront. Noise levels from the jet engine have been estimated to be comparatively eighth power of jet exiting speed. Hence a variation in jet noise, through varying jet velocity, will have a greater influence on the overall noise

generated by the engine when compared to the compressor or turbine. Based on this comparison, the simplest form of reducing jet noise is through a reduction in jet exhaust velocity and hence aircraft speed. Nowadays the most victorious method for decreasing jet sound starting more bye pass engine entails fixing the tab and

chevrons mixer of exhaust nozzles.