So with the caveat that I don't really know anything about this subject (and am merely enthusiastic), there's a handheld near infrared scope new for $2k (from an ad I clicked on in Spectroscopy mag) and here's a list of what it can do:
I don't know much about this subject but I'm definitely interested. Spectroscopy Magazine looks cool and they posted info for an Agilent webinar coming up next week that might be just the background research you're looking for:
https://twitter.com/SpectroscopyMag/status/1504442953246429190?t=8mSQNjeTq7YiyWZblelJXQ&s=19…