CAJ | 학술논문

振弦式传感器的激励常用高压拨弦激振和低压扫频激振两种方式.高压拨弦激振对传感器损伤较大,信号衰减快,测量精度差;低压扫频激振扫描时间长,信号不宜拾取.提出一种反馈式低压激振方法,降低拨弦激振电压对传感器进行预激振,将反馈的振动频率信号作为输出,对传感器进行复振,可以在很短时间内使振弦达到共振状态.设计专用检测电路对调优后的激振策略进行验证,证明该方法激振时间短,共振幅度大.振动幅度的提高可增强抗干扰能力、降低信号处理电路成本、增加可用测量时间、提高频率测量精度.
진현식전감기적격려상용고압발현격진화저압소빈격진량충방식.고압발현격진대전감기손상교대,신호쇠감쾌,측량정도차;저압소빈격진소묘시간장,신호불의습취.제출일충반궤식저압격진방법,강저발현격진전압대전감기진행예격진,장반궤적진동빈솔신호작위수출,대전감기진행복진,가이재흔단시간내사진현체도공진상태.설계전용검측전로대조우후적격진책략진행험증,증명해방법격진시간단,공진폭도대.진동폭도적제고가증강항간우능력、강저신호처리전로성본、증가가용측량시간、제고빈솔측량정도.
Vibrating wire sensor commonly used high-voltage plucked excitation or low-voltage scanning frequency excitation. High-voltage plucked excitation had large damage to sensor, with rapid decayed signal and low measure-ment accuracy; Low-voltage scanning excitation needed to sweep a long time and hard to pick up the signal. This paper presents a low-voltage excitation with feedback method. By pre-excitations, the vibration frequency of the sensor can be got to used as the output of the driver. The feedback signal frequency is very close to the real fre-quency of the sensor, so the wire can reach resonance state quickly. The optimal excitation strategy was verified by the new designed detection circuit. By this way, excitation time is short, resonance amplitude is large, therefore it can enhance anti-interference ability and lower the cost of signal processing circuit, increase the measurement time and improve theaccuracy of measured frequency.