This might sound like a simple/stupid question, but working in photoacoustics often requires substantial work in the form of choosing how to acoustically couple my acoustic sensor to my sample of interest.
http://shop.olympus-ims.com/store/immersion-transducers/?apd=1&adid=webstore&acid=ennbgle&gclid=EAIaIQobChMIjvaL6tvx1gIV0FmGCh2rYAY2EAAYASAAEgILpfD_BwE
Assuming I am using a transducer such as those in the link, what is my best bet for acoustic coupling to reduce bubble formation that is simple to set up, inexpensive, and repeatable?
Obviously, a lot of this depends upon the situation, but I'm interested in hearing what you use for this since I'm trying to figure out what would be easiest given my application. I've seen water coupling, gel coupling, and optical coupling (interferometry), but each of these methods has significant drawbacks (water coupling always seems to have bubbles unless I use a vacuum, gel is the same way, interferometry is expensive).
What do you use?
We typically prepare gel for coupling in syringes which we vacumize and then dose the gel between US-transducer and device wall trough which we intend to measure. - This works generally well.
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