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Control system for automated drift compensation of the stand-alone charge amplifier used for low-frequency measurement

机译：用于低频测量的独立电荷放大器的自动漂移补偿控制系统

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摘要

A charge amplifier is an electronic current integrator that is frequently employed for converting electrical charges or electrical currents into voltage signals. The charge amplifier is very sensitive to DC drift, since the DC component in the input signal leads to a steady accumulation of charge in the feedback capacitor until the output voltage saturates. Various solutions for automated drift reduction have been proposed, but they either (i) disable measurements of low-frequency signals (mHz range), (ii) non-deterministically reset the charge amplifier output voltage, (iii) cannot compensate for high value drifts (above V/s), or (iv) have a high closed-loop time constant, which decreases the disturbance rejection performance and increases settling time. In this paper, we present a control system for automated drift compensation of the charge amplifier periodic output voltage, which solves the aforementioned problems. The proposed solution (i) efficiently rejects disturbances, (ii) offers fast settling time without affecting the measurement accuracy, (iii) can compensate for drift in a large range (up to tens of V/s), and (iv) is low-cost. The presented solution was tested on a charge amplifier that is part of a custom-made dedicated measurement system for automated high-temperature and low-frequency polarization measurements of dielectric materials. The presented results indicate that the proposed automatic control system efficiently compensates for the drift component of the charge amplifier without affecting the measurement precision. Most importantly, with the modifications presented in this manuscript, this system can be easily adapted for other charge amplifier periodic measurement usage examples.
机译：电荷放大器是一种电子电流积分器，其经常用于将电荷或电流转换为电压信号。电荷放大器对DC漂移非常敏感，因为输入信号中的DC分量导致反馈电容器中的电荷稳定累积，直到输出电压饱和。已经提出了用于自动化漂移减少的各种解决方案，但它们（i）禁用低频信号（MHz范围）的测量，（ii）非确定性地复位电荷放大器输出电压（III）不能补偿高值漂移（高于V / s），或（iv）具有高闭环时间常数，这降低了干扰抑制性能并增加了稳定时间。在本文中，我们提供了一种控制系统，用于充电放大器周期输出电压的自动漂移补偿，其解决了上述问题。所提出的解决方案（i）有效地拒绝干扰，（ii）提供快速稳定时间而不影响测量精度，（iii）可以补偿大范围（高达数十次）的漂移，并且（iv）低-成本。在电荷放大器上测试所提出的解决方案，该电荷放大器是用于自动化的专用测量系统的用于自动化的高温和低频偏振测量的电介质材料的一部分。所提出的结果表明，所提出的自动控制系统有效地补偿电荷放大器的漂移分量而不影响测量精度。最重要的是，通过本手稿中提供的修改，该系统可以很容易地适应其他电荷放大器周期性测量使用示例。

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