Thermographic temperature sensor

A system, comprising:

• a gas turbine engine comprising a combustor configured to receive a fuel and air to generate an exhaust gas;
• a thermographic temperature sensor comprising a sensor assembly disposed within a flow path of the exhaust gas, wherein the sensor assembly comprises:
• a housing configured to contact the exhaust gas;
• and
• a light pipe enclosed within the housing and comprising a thermographic phosphor configured to phosphoresce in response to absorbing light, and wherein the phosphorescence by the thermographic phosphor is representative of a temperature of the exhaust gas within the flow path.

A method of measuring a temperature of a fluid, comprising:

• directing light from an optical source to a probe configured to contact the fluid and having a housing and a light pipe disposed within the housing;
• generating phosphorescence from a thermographic phosphor of the light pipe in response to absorbing the light;
• directing the phosphorescence from the light pipe to a detector coupled to the probe;
• and
• determining the temperature of the fluid based on a change in intensity of the phosphorescence over time.