水分检测中自平衡电桥的研究

Research of self-balancing bridge circuit in moisture-testing system

电桥是水分检测系统中的重要组成部分,它是水分检测系统能否达到高精度测量的关键。影响电桥精度的一个重要原因是实际的电桥本身存在不平衡。为克服这一缺点,本文对自平衡电桥进行了研究,通过给其加一个幅值相等但相位相反的信号来抑制电桥本身存在的不平衡的信号,使空载传感器的输出为零。并检验了自制的自平衡电桥的性能。实验结果表明,该电桥满足水分检测系统精度的要求,可以用于实际。

The bridge circuit is an important part of the moisture-testing system, it influences high measure accuracy of moisture-testing system seriously .To overcome the demerit, The paper researchs Self-balancing bridge circuit,providing the performance of self-balancing bridge circuit. The results indicate that the bridge circuit can satisfy the request of precision of moisture-testing system can be used.