Development of Electromagnetic Current Meter for Marine Environment

Ocean current is one of the most important parameters in ocean observation, and measurement based on electromagnetic induction becoming more because its advantages such as simple structure high accuracy. However, it difficult to detect weak signals a complex marine environment. In this paper, an scheme lock-in amplification technology proposed. Key technologies evaluation induced intensity, overall design, circuit orientation design meter were studied. The prototype was developed tested laboratory at sea. repeatability velocity direction higher than 1.5 cm/s 1.5°, respectively. A comparison test between Nortek ADCP (Acoustic Doppler Current Profiler) installed buoy sea carried out, correlation coefficients datum 0.90 0.96, Through continuous on-site fault-free operations sea, experimental data show that has good adaptability which provides feasible technical equipment support for observation.