检测微弱振动的参量电容电桥换能器  

Capacitive Para-bridge Transducer Use for Weak Vibrationdetection

作　　者：彭竑[1] 胡恩科[1] 郑庆璋[1] 

机构地区：[1]中山大学物理学系

出　　处：《中山大学学报（自然科学版）》1991年第2期163-167,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金

摘　　要：本文设计了一种检测引力波天线微弱振动的参量电容电桥换能器,并导出在单一泵频模式下换能器灵敏度的分析表达式,对影响换能器灵敏度的各种因素进行了讨论。The capacitive para-bridge transducer has large coupling coefficient due to a parametrical gain factor.By using a quartz resonator in the transducer circuit, the electrical quality factor and frequency stability of the transducer can be greatly improved.It is shown that a balance bridge transducer has the advantage of restraining pump noise effectively,which is a main problem of active transducer. In addition,the paper gives the sensitivity equation of the transducer,which shows the relations among the effective noise and other noise sources,and makes some discussion about the elements of influencing the sensitivity.

关 键 词：换能器 检测 振动 电容式 引力波 

分 类 号：TN712.3[电子电信—电路与系统]