Method of additively manufacturing a heat exchanger component with embedded sensor

A method of additively manufacturing a component, the method comprising:

• additively manufacturing a first part such that a first surface thereof defines a trench;
• laying down an optical fiber in the trench;
• additively manufacturing a second part onto the first surface and around the optical fiber such that the first part and the second part redefine the trench as a fiber channel in which the optical fiber is embedded;
• and
• applying a thermal barrier coating (TBC) to the optical fiber prior to the additive manufacturing of the second part, wherein:
• the applying of the TBC comprises forming a protruding surface feature which protrudes away from the optical fiber, and
• the additive manufacturing of the second part around the optical fiber comprises forming a recessed surface feature, which corresponds in position to the protruding surface feature and which extends into the second part to accommodate the protruding surface feature.