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OTT ADC
| Acoustic Digital Current Meter |
| Measuring principle
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The ADC emits an ultrasonic burst consisting of ten single pings that will be reflected by suspended particles in the water body (e.g. suspended material, plankton, air bubbles).
Depending on particle size and shape an echo image returns and is processed in the systems DSP (Digital Signal Processor).
After a short interval the instrument emits a second burst and a second echo image will be digitised.
Following the measurement phase the DSP checks both received reflection images for similarities using a cross correlation method. Rejecting all signal differences this method retains two similar images with a time shift which is then used to calculate the water velocity. |
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