Hydrophone Acceleration Data

Ocean Sonics icListen HF and icListen AF hydrophones contain accelerometers which record acceleration in X, Y, and Z axes, and magnetometers which record magnetic field in X, Y, and Z axes.

Acceleration and magnetic data are recorded to .acc files at 1 sec intervals. Samples are also written to ancillary data at the data rating for the device (often 1 sample per minute), and are available independently as scalar data products or via Plotting Utility.

These values can be used to monitor changes in the orientation of the instrument once it has been deployed. icListen HF User Guide 2018

Oceans 3.0 API filter: dataProductCode=HACC

Vertical axis changes

Depending on the 'HardwareVersion' attribute of the icListen Hydrophone that can be found under the Additional Attribute tab of the Device Detail URL, the vertical axis varies as follows and the details can be found in this Ocean Sonics document

Hardware VersionVertical Axis
4-Y
6No Orientation sensors
7+X
8-X

Note that the diagram has the hydrophone element drawn as laid horizontally, but in our deployments the element is deployed pointing with the tip upwards.

Revision History

  1. 20180904: HACC released

Data Product Options

There are no options for this data product.

Formats

Raw acceleration and magnetic data are combined in a single file format ACC.

ACC files

An example ACC file:

ICLISTENAF2556_20191009T000000.000Z.acc

ACC/.acc files are in the format:

20191009T000003.363Z -451,-883,-129,65,391,-654
20191009T000004.152Z -452,-882,-132,66,393,-649
20191009T000005.156Z -450,-881,-132,61,405,-643
20191009T000006.157Z -450,-880,-130,59,398,-635
20191009T000007.157Z -449,-880,-130,64,392,-647
20191009T000008.157Z -449,-880,-130,64,392,-647
20191009T000009.159Z -453,-882,-135,64,393,-655
20191009T000010.157Z -451,-882,-133,61,401,-644
20191009T000011.160Z -450,-885,-132,63,392,-651
20191009T000012.157Z -451,-877,-126,64,391,-652
...

Where:

  • the first column is a timestamp followed by a space
  • the next 6 columns are comma-separated data representing:
    • acceleration X
    • acceleration Y
    • acceleraton Z
    • magnetic X
    • magnetic Y
    • magnetic Z

Oceans 3.0 API filter: extension=acc

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