Hey all. I'm drawing up the specs for an at-sea recorder, geared towards recording migratory bats and birds. We're going to likely be using some of the Wildlife Acoustics (WA) bat minis, but we will have like 20+ stations, so are looking into AudioMoths as a cheaper yet reliable alternative.
However, most mics for these units are 'weather-resistant' rather than waterproof. Meaning they can withstand the rain, but not being dunked underwater (which is a reasonable event that may happen to some of our units). WA does make a waterproof design, but it is expensive (SMM-U2). I've also stumbled onto Dodotronics Momimic, but they have zero specs on their page. Has anyone used one before?
We are looking for something with at least an IP57 rating. Straight up hydrophones are not a good alternative, as the recording quality would be negatively impacted. We are open to potting some mics ourselves, but would prefer an off the shelf alternative.
Thanks for your advice in advance!
21 April 2021 2:40pm
You may want to consider enclosing the mic in an IP57 enclsoure with a cutout covered by an ePTFE membrane. ePTFE membranes are breathable membranes rated to be waterproof to 10m depth. You may want to do some testing though as well. ePTFE are the membranes that cover mics and speakers on waterproof smart phones. If you can't locate any, let us know. We have a few of them in stock.