一种新型的惯性式特殊低频传感器  

Novel inertial extremely low frequency transducer

作　　者：杨学志[1] 毛乐山[1] 严普强[1] 

机构地区：[1]清华大学精密仪器与机械学系

出　　处：《清华大学学报（自然科学版）》1998年第11期73-76,80,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金

摘　　要：磁电式速度检波器是工程中常用的传感器，但受其固有频率的限制，不适于测量低频振动。本文详细研究了在检波器的输出端并联电容对检波器特性的影响，发现并联电容的效果相当于增加悬挂系统的当量质量和当量阻尼系数。这种做法的特点在于以损失高频段的灵敏度为代价，换来系统固有频率的降低和机械量程的扩大及耐冲击性能的提高，与此同时，低频段的信号强度并没有明显减弱。在此基础上，用电路网络对磁电式检波器的低频特性作进一步的校正，得到了惯性式特殊低频传感器。A seismic velocity transducer (SVT) is the commonly used pickup in engineering. However it is unsuitable for low frequency vibration measurement due to the limitation set by the mechanical natural frequency. It is showed that connecting a capacitor in parallel to the output terminal of SVT means the equivalent mass and damping coefficient are increased. The reliability and measurement range are increased and the natural frequency is lowered at the cost of the decrement of sensitivity at high frequency band. And the decrement of sensitivity of the pick up at low frequency band can not been visibly observed. A circuit network is used to further compensate the low frequency characteristics and a novel type of inertial extremely low frequency transducer is obtained.

关 键 词：惯性式 低频传感器 低频特性补偿 低频振动 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH825[自动化与计算机技术—控制科学与工程]