Low Noise Signal Conditioning Design for Electrostatic Sensors
Low Noise Signal Conditioning Design for Electrostatic Sensors
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发表时间：
2013-12
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通讯作者：
T. Tajdari;M. F. Rahmat;N. Wahab;I. T. Thuku
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作者：
T. Tajdari;M. F. Rahmat;N. Wahab;I. T. Thuku
静电传感器的信号调节电路是一个小信号放大器，用于收集和放大检测到的静电噪声。由于其高放大特性，输出信号非常容易受到内在或外在噪声的影响。提出了一种用于静电传感器的低噪声信号调理电路。提出了一个电路模型作为传感器的电极，用于电路设计和电路分析。采用高阻抗FET运算放大器设计了一种静电噪声采集放大器。采用单电池双电源供电，可将电路与50 Hz外部噪声隔离。研究了其增益、带宽和噪声特性。传感器测试结果验证了设计目标。该电路可用于粉末和颗粒技术中使用静电传感器的低噪声测量系统的设计。Copyright © 2013 IFSA.
The signal conditioning circuit of the electrostatic sensor is a small signal amplifier that collects and amplifies the detected electrostatic noise. Due to its high amplification properties, the output signal is highly susceptible to be defaced by intrinsic or extrinsic noise. This paper is proposed a low noise signal conditioning circuit for electrostatic sensor. A circuit model is proposed as the electrode of the sensor to be used in circuit design and circuit analysis. An electrostatic noise collector amplifier is designed using a high impedance FET operational amplifier. A dual power supply using a single battery is provided to isolate the circuit from 50 Hz extrinsic noise. The design is investigated for its gain, bandwidth and noise properties. The sensor test results verified the design objectives. The circuit can be used to design a low noise measurement system using an electrostatic sensor in powder and particle technologies. Copyright © 2013 IFSA.