I have a relatively small budget but I would like to purchase a hydrophone that would enable me to call and describe the vocalisations of frogs underwater. The animals I hope to record are in glass 20 L glass enclosures
Just a word of caution when recording with a hydrophone in a closed (20L) container. Any vocalizations by the frog will reach the hydrophone via the direct path and via various paths after reflections from the tank. The hydrophone will measure the sum of the sound arriving via all the paths. Ideally, you would want to measure the sound pressure level via the direct path only. There are at least two ways to make the correct measurement. 1.Measure the frog vocalizations in a natural pond (without glass surfaces) to minimize reflections. 2. Measure during a discrete time window that includes the earliest arriving wave (the direct wave) and then stop the measurement before any of the reflected waves arrive. The larger the tank, the easier this is to do. I hope this helps.
Maybe you can find something useful in here:
Article Acoustic underwater signals with a probable function during ...
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