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.
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.
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