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Linearised two-phase alternating-current bridge for precision measurements of predominantly seawater parameters such as temperature, and others
Linearised two-phase alternating-current bridge for precision measurements of predominantly seawater parameters such as temperature, and others
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机译：线性化两相交流电桥，用于精确测量主要海水参数（例如温度等）
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摘要
In this arrangement, changes in the parameter values to be measured by means of a bridge arrangement are allocated to phase angle changes and, from these, time intervals can then be obtained which are counted out. The total arrangement thus delivers the values to be measured directly in digital form so that it can be considered to be a special type of A/D converter. The phase angle produced or the time interval to be counted out, respectively, have the functional relationship of a tangent function with the value to be measured. It is intended to develop this circuit arrangement in such a manner that a linear relationship between the value of the measurement quantity and the associated digital measurement value is produced in that, initially, a type of preprocessing of the measurement value to be obtained from the first bridge circuit takes place in such a manner that due to the obtaining or generating of a calibrated countervoltage for the two-phase bridge circuit, only residual voltages remain for which the tangent function is sufficiently linear.
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