During the next decade there will be growing pressures placed upon the manufacturers of gas turbines to produce more operationally efficient engines.

There are two main end-use groupings for gas turbines. The parameters for efficiency may prove to be quite different for these end-use groups, requiring a separate emphasis for engineering design.

With respect to aircraft propulsion gas turbines, the efficiencies may tend towards greater fuel economy and unit power outputs. In contrast to this the ground based gas turbine units may require increased unit power output but be restricted by the tightening emission requirements being dictated by international pollution laws.

One of the key areas of focus for engineering design, in order to satisfy such performance demands, is that of improved operational control of the turbine.

The process variables requiring accurate, reliable and repeatable monitoring and control include rotational speed, linear speed, pressure, mass flow rate and temperature. Whilst all of these phenomena require correct control, it may be argued that temperature is of extreme importance for both an operational efficiency and safety viewpoint.

This paper will attempt to explore the problems associated with conventional methods of gas turbine temperature measurement and discuss possible solutions using novel new technologies that will allow the earlier realisation of these efficiency goals.

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