一种高精度自校准量程自适应电导率检测电路
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中北大学

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TN782+.2

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A high-precision self-calibrating range adaptive conductivity detection circuit
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    摘要:

    针对传统的水质检测、农业灌溉、金属材料工艺控制以及新兴的酒类鉴别,含盐量检测、药物提取等新型问题中,对电导率测量精度,测量范围的要求不断提高,要求电导率测量设备不仅要适用于实际生产应用中低电导率的测量,还需要兼顾高电导率的测量,且电导率测量精度需求越来越高。本文针对以上问题设计了一种高精度自校准量程自适应的电导率检测电路,通过电路将带有电导率信息的激励信号与未过电导池的参考激励信号进行互相关运算并由低通滤波器对其进行滤波得到与电导率相关的电压信号。正弦激励幅度可调电路与电导率测量电路中自动校准模块相互合作完成电路的自动校准,量程切换电路保证了电导率测量的宽量程,弥补了传统电导率测量电路定量程、测量范围小、精度差的缺点。测试结果表明,电导率测量电路可以测量电导率范围为0-30000uS/cm,测量精度为0.01uS/cm,测量基线噪声为0.3ns/cm。

    Abstract:

    In view of the traditional water quality testing, agricultural irrigation, metal material process control and emerging wine identification, salt content detection, drug extraction and other new problems, the requirements for conductivity measurement accuracy and measurement range are constantly improving, requiring conductivity measurement equipment not only suitable for low conductivity measurement in practical production applications, but also need to take into account high conductivity measurement, and the demand for conductivity measurement accuracy is getting higher and higher. In this paper, a high-precision self-calibrating range adaptive conductivity detection circuit is designed, through which the excitation signal with conductivity information is cross-correlated with the reference excitation signal of the unpassed conductivity cell, and the conductivity-related voltage signal is obtained by filtering it by the low-pass filter. The sinusoidal excitation amplitude adjustable circuit and the automatic calibration module in the conductivity measurement circuit cooperate with each other to complete the automatic calibration of the circuit, and the range switching circuit ensures the wide range of conductivity measurement, making up for the shortcomings of the traditional conductivity measurement circuit of quantitative range, small measurement range and poor accuracy. The test results show that the conductivity measurement circuit can measure the conductivity range of 0-30000uS/cm, the measurement accuracy is 0.01uS/cm, and the measurement baseline noise is 0.3ns/cm.

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历史
  • 收稿日期:2022-11-28
  • 最后修改日期:2023-02-20
  • 录用日期:2023-02-20
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