System and method for measuring temperature within a turbine system

A system (10) includes a radiation detector array (52) configured to direct a field of view (74) toward multiple conduits (60) within a fluid flow path from a turbine (16, 34) into a heat exchanger (26, 40). The radiation detector array (52) is configured to output a signal indicative of a multi-dimensional temperature profile of the fluid flow path based on thermal radiation emitted by the conduits (60). The system (10) also includes a controller (54) communicatively coupled to the radiation detector array (52). The controller (54) is configured to determine a temperature variation across the fluid flow path based on the signal, and to compare the temperature variation to a threshold value.