噪声与振动控制2016，Vol.36Issue(5)：1-5,5.DOI:10.3969/j.issn.1006-1335.2016.05.001
超声波测振信号的能量算子解调方法
Energy Operator Demodulation Method of the Ultrasonic Vibration Measurement Signal
摘要
Abstract
A continuous ultrasonic beam is emitted towards the moving surface and the received ultrasound signal is phase modulated by vibration signal due to the Doppler Effect. The AM-FM signal is derieved from the derivative of the received ultrasound signal. The instantaneous frequency and instantaneous amplitude of the AM-FM signal are obtained through symmetrical difference of the energy operator demodulation. The amplitude attenuation of the received ultrasound signal is inevitable, but its frequency is not susceptible to external interference. So, the vibration speed of the object can be obtained from the instantaneous frequency of the AM-FM signal, and the vibration acceleration can be obtained from the derivative of the vibration velocity. The range of vibration measurement is discussed from the viewpoints of amplitude and frequency. Simulation and experiment results show that the energy operator demodulation method for the ultrasonic vibration measurement signal can effectively extract the vibration signal and this method has larger measurement range than the traditional phase demodulation method.关键词
振动与波/超声波/振动检测/能量算子/瞬时频率/解调Key words
vibration and wave/ultrasonic/vibration measurement/energy operator/instantaneous frequency/demodulation分类
通用工业技术引用本文复制引用
曹青松,陈刚,毕彬杰,周继惠..超声波测振信号的能量算子解调方法[J].噪声与振动控制,2016,36(5):1-5,5.基金项目
国家自然科学基金资助项目 （）
