IR detection has very limited ability to detect corona, since corona emits very little heat. Experience shows that only advanced stages of corona, which are in fact arcing, can sometimes become visible to IR. For IR to see corona it might be possible to carry out inspections at night, when the components cool down, and even then the temperature difference is slight and hard to detect.
IR and UV technologies cannot be used under the same conditions, neither ambient nor electrical. IR inspection relies on current, the higher the current (lower voltage) the more valid is the test, UV inspection,on the other end, relies on voltage. The higher the voltage (lower current) the higher is the UV discharge.