(2)..let me know. Also the original paper you cite https://royalsocietypublishing.org/doi/10.1098/rspa.2015.0624 … has a follow-up at https://royalsocietypublishing.org/doi/full/10.1098/rspa.2016.0828 … There is a project website at https://www.southampton.ac.uk/engineering/research/projects/are-some-people-suffering.page … There’s more...
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It's insidious, because the inability to localize the sound, and not being used to sounds that high, make it difficult to immediately recognize it as such. I've been in places where something felt off but only upon getting close enough to the emitter did I realize what it was.
"When sound becomes hostile"... 
I'm interested in taking calibrated measurements of this. Do you have any suggestions as to what to use for a calibration standard? I have an omni measurement microphone that should be flat enough, I'm thinking maybe I can calibrate the overall gain against a sound level meter.
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Calibration is not easy at these frequencies & a calibration traceable to national standards is what you want, but expensive. We at Southampton or Dr Ueda in Japan might do a rough one for you. Don’t trust a standard sound level meter at these frequencies, because....
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.. as the paper https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2015.0624 … says in several places (search for “sound level meter” in it) a sound level meter that purports to detect to 20 kHz & higher can pass acceptance standards for sale but be as insensitive as a brick at these frequencies.
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