CTDs come in a variety of shapes, sizes, and applications. Most oceanographic vessels have a CTD connected to a rosette system, which can house other instruments and collect physical water samples in parallel with real-time data collection. CTDs are also commonly attached to moorings, autonomous underwater vehicles (AUVs), remote-operated vehicles (ROVs), and, on occasion, marine animals.
Commercial CTDs are expensive, with the most affordable models costing as much as $6,000.00. The expense of the CTD is a barrier-to-entry for formal and informal researchers working with limited budgets.
The latest model – now using Adafruit Feather
The OpenCTD can be built in two days by someone with no electronics experience using parts available from hardware stores, electronics suppliers, Adafruit.com as well as a few 3D-printed components for about $300. It is rated to depths of 140 meters, providing access to the majority of the world’s continental shelf for a fraction the cost of a traditional research cruise.
Read more about OpenCTD and how true sensor data collection can be done economically:
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