Amplitude demodulation vibration positioning detection method based on double-difference step length

• Main Authors: ZHANG WENTAO, XIONG XIANMING, QIN ZUJUN, CHEN CONG, GAO JIANGJIANG
• Format: Patent
• Language: Chinese; English
• Published: 25.03.2022
• Subjects: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; PHYSICS; TESTING

The invention discloses an amplitude demodulation vibration positioning detection method based on double difference step lengths, and the method comprises the steps: introducing two different difference step lengths on the basis of a conventional difference accumulation algorithm, and carrying out the accurate design of a first difference step length and a second difference step length, the relation among the vibration signal frequency, the total number of backward Rayleigh scattering signals and the difference step length is fully utilized, the calculation efficiency and the signal-to-noise ratio of the system are effectively improved, the strong dependence of a traditional amplitude difference accumulation algorithm on the detection signal frequency is reduced, and the probability of vibration signal leak detection is reduced. 本发明公开一种基于双差分步长的幅值解调振动定位检测方法，在传统差分累加算法的基础上，引入了两种不同差分步长值，并对第一差分步长和第二差分步长进行准确设计，充分利用了振动信号频率、后向瑞利散射信号总条数和差分步长之间的关系，有效提高了系统的计算效率和信噪比，并减少了传统幅度差分累加算法对探测信号频率的强依赖性，降低振动信号漏检的概率。