Microprocessor based direct read out system for Aanderaa currentmeter

Abstract

Before deployment and subsequent retrieval of currentmeters, it is essential to check all the sensor parameters getting recorded on the magnetic spool. This paper outlines a scheme, developed at NIO, for online reading of the sensor parameters separately on the LED. The binary coded electrical signal available at the top end plate of the currentmeter is tapped and after suitable inversion, is fed to the system designed around a commercially available microprocessor board. The system sequentially displays N-value of the 6 sensor parameters including the reference number of the currentmeter during the measuring cycle. This system is routinely used for checking and calibrating the currentmeters in NIO and onboard vessels. In conjunction with hydrophone transducer, it can be used for real time monitoring of data recorded in the moored currentmeter.