Pile drivers, shipping traffic and off-shore oil exploration are just a few of the anthropogenic contributors to an increasingly noisy ocean environment. We can only guess at the effects on marine life when noise levels can exceed 200 dB SPL every 10 seconds. As a result, our SM2M+ Deep Water and Submersible marine recorders are being used not only for recording the sounds of marine life, but also for noise logging. In fact, our products are unique in that they are designed to serve both functions.
With a recording bandwidth of 2hz to 48kHz (or 192kHz for the ultrasonic option), the SM2M+ recorders are perfect for capturing any ocean noise. The recorders log recording levels while making recordings and the log can be quickly converted to actual sound pressure levels (SPL) using the gain and hydrophone sensitivity settings. We provide calibration data with all recorders so as to assure accuracy of the SPL readings. Both ambient and peak measurements are logged.
The SM2M+ recorders also have great battery life, and there are several options to extend deployment. For example, you can employ a recording schedule to stop/start recording at select times. The patented SM2M+ sleep mode makes power consumption negligible in between recordings. Other means to lengthen deployment include Recording Compression or Adaptive Triggering, where the recordings are triggered by crossing a set sound level threshold.
Imagine if you will, a field biologist’s worst nightmare.
You’ve taken care to set up your SM2+ units, deployed them in the field, checked to make sure your units have all powered up, and then set them to sleep. You trek back out of the back country to the access road you fought mud, rain, and blind corners to navigate. You go home, set aside your soaked clothes, pour a cup of your hot beverage of choice, and sit confident knowing your trusty SM2+ recorders will gather all the data you need for that big project.
A month later, you range out to the same patch of woods, unearth your recorders from the fallen pine needles, brush it off, and take the SD cards that hold your precious data back to base. Upon opening your recordings in Song Scope, you find to your deepest horror that nothing was recorded. Your heart sinks as you begin to understand the full consequences to the loss of data. The world spins as a Lovecraftian level of terror creeps in…