Some Links I found looking into this again recently. Some related, Some, IDK.

Overview:

https://www.scientificamerican.com/article/tiny-bubbles-explain-puzz/

https://www.nytimes.com/1996/12/31/science/mysterious-light-from-tiny-bubbles-finds-practical-uses.html

How to:

http://www.techmind.org/sl/ and its archive: http://archive.is/xtfTb

Other information:

A big list of stuff about Casmir and Quantum effects found from this K.A. Milton guy at Cornell who appears to be a debunker of this stuff perhaps? IDK.

Casmir effect and quantum vacuum energy. Seems related to Sono, but I just don’t know enough to be sure.

http://archive.is/23Pil

https://arxiv.org/pdf/1401.0784.pdf