Preprints
https://doi.org/10.5194/gi-2022-22
https://doi.org/10.5194/gi-2022-22
22 Nov 2022
 | 22 Nov 2022
Status: a revised version of this preprint was accepted for the journal GI and is expected to appear here in due course.

Development of an Expendable Current Profiler Based on Modulation and Demodulation

Keyu Zhou, Qisheng Zhang, Guangyuan Chen, Zucan Lin, Yunliang Liu, and Pengyu Li

Abstract. We designed a low-cost expandable current profiler including software and hardware. An expendable current profiler (XCP) is an observation instrument that rapidly measures currents based on the principle that currents cut the geomagnetic field to induce electric fields. It is important to reduce the cost of an XCP because it is a single-use device. The digitization of the previously developed XCP is carried out underwater, which requires the probe to contain not only analogue circuits for acquiring signals but also digital circuits and digital chips, which are relatively expensive. In this study, an XCP has been developed that adopts signal modulation and demodulation to transmit analogue signals on an enamelled wire, and the signal digitization occurs above the surface of the water. The cost of the instrument is effectively reduced by half while maintaining the ability to measure parameters such as sea current and temperature in real-time. After comparison with data processed from laboratory tests, the acquisition circuit showed accuracy within one-thousandth of one per cent, and the XCP analogue circuit developed for the overall system was stable and reliable. The system exhibited an acquisition accuracy higher than 50 nV for 16 Hz, and the quality of the acquired signal met the requirements for an XCP instrument.

Keyu Zhou et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gi-2022-22', Anonymous Referee #1, 05 Jan 2023
    • AC1: 'Reply on RC1', Qisheng Zhang, 31 Jan 2023
  • RC2: 'Comment on gi-2022-22', Anonymous Referee #2, 31 Jan 2023
    • AC2: 'Reply on RC2', Qisheng Zhang, 06 Feb 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gi-2022-22', Anonymous Referee #1, 05 Jan 2023
    • AC1: 'Reply on RC1', Qisheng Zhang, 31 Jan 2023
  • RC2: 'Comment on gi-2022-22', Anonymous Referee #2, 31 Jan 2023
    • AC2: 'Reply on RC2', Qisheng Zhang, 06 Feb 2023

Keyu Zhou et al.

Keyu Zhou et al.

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Short summary
The expendable current profilers (XCP) is a single-use instrument that rapidly measures currents, including the velocity, flow direction and temperature of seawater. This study improves upon the design of XCP to reduce the cost of the single-use devices. This has been achieved by adopting signal modulation and demodulation to transmit analog signals on an enamelled wire and digitizing the signal above the surface of the water.