Patent ID: 7003425

Claim:
A method of measuring temperature of a component capable of emitting thermal radiation and reflecting background radiation comprising the steps of: i) providing a pyrometer for measuring the radiation from the component, characterised by ii) coating a part of the component with a first emissivity coating and a part of the component with a different and second emissivity coating, each with known emissivities E H and E L respectively, iii) recording a first radiation measurement from the first emissivity coating R H and a second radiation measurement from the second emissivity coating R L , iv) then calculating the true radiation R Blade from the component from the equation R Blade = ( R H E H - R L E H ⁢ ( 1 - E H 1 - E L ) ) ( 1 - E L E H ⁢ ( 1 - E H 1 - E L ) ) and relate the R Blade value to the true component temperature by calibration of the pyrometer.