Question 310General Subjects - 1st Asst/Chief

The correct answer is B) Comparative thermography. Comparative thermography involves comparing the thermal signature of a piece of equipment suspected of having a fault with the thermal signature of similar, fault-free equipment. This allows the analyst to identify any differences in the thermal patterns that could indicate the presence of a fault or defect in the equipment under investigation. The other options are incorrect because: A) Spectral thermography refers to the analysis of the infrared spectrum emitted by an object, which is not the same as comparing thermal signatures. C) Baseline thermography is the process of establishing a reference thermal profile for equipment, which is not the same as comparing it to another piece of equipment. D) Thermal trending involves monitoring changes in the thermal signature of a single piece of equipment over time, rather than comparing it to another.