Concept
Cabled Observatory Reciprocal Acoustic Scintillation System (CORAS)
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL2023/ | ||
|---|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | ||
| Alternative Labels | CORAS | ||
| Definition | The Acoustic Scintillation Flow Meter (ASFM) is a specialised acoustic instrument that uses forward scatter acoustic propagation methods to estimate the velocity of the medium between transducers positioned in the direction perpendicular to parallel transducer placement. The Cabled Observatory Reciprocal Acoustic Scintillation (CORAS) instrument allows for real-time output over Ethernet cable. The instrument has particular applications in real time monitoring of vertical velocity of deep sea hydrothermal vents and natural methane and oil seeps by transmitting sound through the plume. The instrument measures coherent turbulent flow patterns to quantify the contributions that the fluids make to the chemical and thermal budget of the global ocean, or upwelling velocities. Vertical velocity and turbulent characteristics are measured over time to quantify temporal variability. Sound is transmitted at a carrier frequency of 307 kHz using a toroidal transducer, with a path length of 80 m. Beam pattern is 10 degrees in the vertical plane, and omnidirectional in the horizontal plane. | ||
| Date | 2024-04-08T10:49:23 | ||
| Identifier | SDN:L22::TOOL2023 | ||
| Note | accepted | ||
| Has Current Version | 1 | ||
| version | 1 | ||
| inScheme | http://vocab.nerc.ac.uk/scheme/SDNDEV/current/ | ||
| Broader | L05:388 |
flow meters | Mapping: 1848845 |
| Related | B75:ORG01938 |
Ocean Networks Canada | Mapping: 1848846 |
| L35 SenseOcean device developers and manufacturers - (3) | |||
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