摘要
无损检测和分级是提高库尔勒香梨的市场竞争力的关键,基于振动频谱特性的无损检测技术能够实现库尔勒香梨的内部品质检测和分级。为了使振动频谱法检测库尔勒香梨坚实度的装置实现便携化应用,本研究针对香梨振动信号的特点,设计了由电荷放大电路、电压放大电路、低通滤波电路、高通滤波电路和电压偏置电路组成的信号调理电路。仿真和实验结果表明:该调理电路能够对香梨振动的微弱电荷信号进行有效的放大和滤波,所测得的信号与通用电荷放大器所获得的信号基本一致,两者输出信号的峰值平均值偏差在1%以内,调理电路背景噪声最大为1.5 m V。该调理电路体积小、成本低,有望在库尔勒香梨的无损检测研究中替代通用电荷放大器以实现检测装置的便携化应用。
Non-destructive testing and gradingare the keys to improvthe competitiveness of Korla Pear, and studies have shown that non-destructive testing techniques based on spectral characteristics of vibration can achieve Korla Pear internal quality testing and grading. In order to make the vibration spectrum detecting Korla Pear Firmness achieve portable applications, the present study, considering the characteristics of vibration signals pear, designs a signal conditioning circuit consisting of charge amplifier, voltage amplifier, low-pass filter circuit, a high-pass filter circuit and voltage bias circuit means. The simulation and experimental results show that the conditioning circuit can amplify and filter weak signal pear vibration, the last signal obtained is similar with the signal obtained with universal charge amplifier.The peak average deviation of these two kind of signal between is less than l%.The background noise of conditioning circuit is up to 1.5 inV. The conditioning circuit is small, low cost, so it is expected to replace common charge amplifier in Korla Pear NDE research to achieve application of portability detection device. In this paper, the firmness of Korla pear was measured using a detection device based on the vibration spectrum method. In order to realize portable applications of this device, a signal conditioning circuit composed of a charge amplifier, a voltage amplifier, a low-pass filter circuit, a high-pass filter circuit and a voltage bias circuit was designed according to the characteristics of vibration signal of Korla pear. The simulation and experimental results showed that the vibration signal could be amplified and filtered effectively. The signal measured by the signal conditioning circuit was basically the same with the signal obtained with universal charge amplifier and the deviation was less than 1%. The Maximum background noise was 1.5 mV. With small size and low cost,the conditioning circuit is expected to replace universal charge amplifier in portable detection device of Korla Pear.
出处
《石河子大学学报（自然科学版）》
CAS
2015年第4期518-523,共6页
Journal of Shihezi University(Natural Science)
基金
新疆兵团博士资金项目(2013BB11)
关键词
库尔勒香梨
振动信号调理
电荷放大
电路仿真与实验
Korla pear
vibration signal conditioning
charge amplifying
circuit simulation and experiment
