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    • 31. 发明授权
    • Method of compensating the interference DC voltages in the electrode
circuit in magnetic-conductive flow measurement
    • 在导磁流量测量中补偿电极电路中的干扰直流电压的方法
    • US4422337A
    • 1983-12-27
    • US304169
    • 1981-09-21
    • Peter Hafner
    • Peter Hafner
    • G01F1/60
    • G01F1/60
    • An arrangement for magnetic-inductive flow measurement of an electrically conductive liquid flowing in a conduit includes a magnetic field generator which generates a periodically reversed magnetic field passing through the conduit perpendicularly to the flow direction. In the conduit two electrodes are disposed. The voltage taken from the electrodes is applied to a measuring amplifier. Connected to the output of the measuring amplifier are two sample and hold circuits which are controlled by a control circuit in such a manner that they sample the output voltage of the measuring amplifier for equal induction values of opposite sign of the magnetic field and store the sampling values until the next sampling. A subtraction circuit forms the difference of the stored sampling values. In a control loop between the output and the input of the measuring amplifier there is a storing control circuit which in predetermined compensation time intervals forms a compensation voltage value regulating the output voltage of the measuring amplifier to zero. The compensation method resides in that each compensation time interval lies within the time interval, corresponding to the switched-on magnetic field, in which also the preceding sampling time interval lies.
    • 用于在导管中流动的导电液体的磁感应流量测量的布置包括磁场发生器,其产生垂直于流动方向穿过导管的周期性反转的磁场。 在管道中设置两个电极。 从电极取得的电压被施加到测量放大器。 连接到测量放大器的输出的是两个采样和保持电路,它们由控制电路控制,使得它们以与磁场相反的相等的感应值相等的方式对测量放大器的输出电压进行采样,并存储采样 值直到下一次抽样。 减法电路形成存储的采样值的差异。 在测量放大器的输出和输入之间的控制回路中存在一个存储控制电路,其在预定的补偿时间间隔内形成将测量放大器的输出电压调节到零的补偿电压值。 补偿方法在于,每个补偿时间间隔在对应于接通磁场的时间间隔内,其中也是先前的采样时间间隔。