The revolution in high speed micro-controllers has allowed their use in the Integrated CTD allowing for real time numerical correction for drift in the analog signal processing circuitry. Available instrumentation for these tasks is severely limited by accuracy, power, long-term stability, and high cost. This is a major advantage for long duration observations over existing high accuracy conductivity sensors. Size and measurement performance of the instrument allow use with a wide variety of new sensing system platforms such as drifters and pop-up buoys. Micro-CTD architecture allows for either data storage or data telemetry by acoustic, inductive, or hardwired telemetry.
Paper covers system architecture, preliminary specifications and calibration data.
This paper, written and presented by Neil L. Brown at Oceanology International in 1992 is the premise of all FSI acoustic current meter technology. Much has been learned about ocean dynamics by making measurements of ocean currents with traditional electromechanical type current meters. New acoustic measurement techniques offer the potential to overcome these limitations. Falmouth Scientific Inc. has a full range of instruments for measuring direction, velocity and, in the case of waves, directional and point spectra. All three instruments use Falmouth Scientific's acoustic current measurement technique, which is based on measuring and comparing direct path acoustic phase shifts along multiple paths.