Consider that not just overheating of a component may indicate a failure, but also overheating the wrong component. You could monitor a heatsink's growing heat dissipation and still be happy, but when the overheat is related to a component that usually should not, this would indicate a short, or an error in the project.
So, it depends on what you plan to troubleshoot, and on the level of the power quality you indulge.
Yes, I agree it probably would, although it would not be able to determine that it was harmonics causing the overheating without electrical analysis of the supply. But it would indicate that an overheating issue is present.
It depends what you are actually going to define as 'power quality'. In my field that is referring more how pure the sinewave is, so we are more in to harmonics analysis.
A thermal imager is a general purpose tool that can be used to look for poor connections due to the excessive heat they give off. I guess you may look at that as power quality to some extent as the poor joints can cause excessive voltage drop.
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