一种新型海水盐度测量技术

该文提出了一种新型电导法测量海水盐度的技术方案,该方案采用交流自动平衡电桥测量法,以防止海水电解,同时能够达到高的测量精度。该测量方案采用全数字技术实现程控方波交流激励,并采用积分零点偏移自动校正方法消除激励源波形的不对称性,克服直流电解效应;桥路的自动平衡电压由高精度(18位)DAC发出,非平衡桥路电压经高灵敏数字检流计检出,CPU按照逐次逼近的算法逐位调节DAC的值,达到电桥平衡,从而实现了桥路的自动测量。

A New Technology of the Salinity Measurement

The paper presents a new technology project of the salinity measurement of the seawater based on conductivity method.The project uses the ac automatic balance-bridge measurement method to prevent the electrolysis of the sea water and achieve high measurement accuracy.The measurement program implements the square wave AC excitation with full-digital technology,and auto-calibration method with the integral of the zero offset to eliminate the asymmetry of wave excitation in order to overcome the effect of the ...