Configurable Filter-Based Endpoint Detection in DMZI Vibration System

In order to accurately determine the vibration starting point of a disturbance frame in the dual Mach-Zehnder interferometry vibration system, this letter proposes a novel endpoint detection method based on convolution window filtering. Through analyzing the fast Fourier transform spectrum of the undisturbed noise, we can acquire the cutoff frequency parameter to configure one high-pass filter to remove the noise, which mainly consists of low-frequency components. Then, the time instant corresponding to the vibration starting point can be detected through applying a thresholding search to the output of the high-pass filter. Experiments show that the proposed detection method outperforms the wavelet-based method. Hence, the proposed detection method has wide application values for its high precision, flexibility, and reliability.