Test And Experiment On Extensometer And Water Tube Tiltmeter

Crustal deformation measurement is an important method for studying crustdeformation and tide.It plays a significant role in Geodynamics and earthquakeprognostic observation.In this paper, we design a detection device of extensometer and water tubetiltmeter, which used for detecting the input and output signals. We get the transferfunction and the sensitivity of Deformation instrument by testing the detectiondevice.It provides a reference to design the Crustal deformation measurementstandard, and it is useful for deformation instrument testing technology research.Data processing and analysis base on the experimental data of crustaldeformation instrument of extensometer and water tube tiltmeter. In systemidentification data processing a higher precision of identification method isproposed, and compared with the traditional identification method, the error areanalyzed.We analyze the amplitude and phase property of the instrument with thetransfer function, and get the pass frequency range and transition zone of theinstrument system.It provides theoretics to ascertain instrument sampling rate.This paper chooses the24points in signal frequency by instrument frequencyband range, and the earth motion signal simulation is included with its originalsignal diagram and power spectrum diagram obtained. And then by differentsampling rate we take sample in the original data, analyzing the sampling results andthe power spectrum. Combining with the power spectrum, we analyses the cause of"aliasing" signals and "aliasing" signal frequency in sampling results.The detection device can not provide sine calibration signal, therefore, we onlydo the crustal deformation instrument test and experimental study mainly on thetime domain. Research on crustal deformation instrument frequency domain, it willbe the focus of future research.