What distinguishes passive thermography from other methods?

Passive thermography is characterized by its ability to detect temperature variations using the natural heat emitted from an object rather than requiring an external or active heat source. This method relies on the inherent thermal radiation that all objects emit, which varies based on temperature differences. This distinguishes it from active thermography, which requires an external heat source to induce temperature changes that can then be measured.

In passive thermography, infrared cameras are used to capture this thermal radiation and create images that highlight the temperature differences across a surface. While the technology may utilize infrared cameras, it's not limited to them exclusively; therefore, the method itself is not defined by the exclusive use of these cameras. Furthermore, passive thermography can provide both qualitative and quantitative data, allowing for deeper analysis rather than being restricted to purely qualitative assessments. Thus, the strength of passive thermography comes from its ability to function without additional heat sources, making it a valuable tool for various applications, such as building inspections and electrical system monitoring.