Test And Research Of Three-dimensional Borehole Strain Gauge

This thesis describes the test study of multiple parameters of the three-dimensional borehole strain gauge,mainly completes to test the linearity,sensitivity,frequency response and other parameters of the instrument,then studies and analyzes the test data.At present,there is no comprehensive test study on the three-dimensional borehole strain gauge in China.We are developing the three-dimensional borehole strain gauge,and will test the important parameters of the instrument by using non-contact micro-displacement technology for the first time,will use some new sensors such as the high-precision capacitive displacement sensor,the high-precision nano-scale piezoelectric ceramics and the fiber optic gyroscopes.The data obtained in this test is more accurate,more stable and more reliable,and then the data is analyzed and the problems are not improved.Finally,the parameters meet the technical requirements of the project,and the output data of the the three-dimensional borehole strain gauge is promoted to be accurate and stable.Three-dimensional strain dynamic observation and real-time intelligent analysis are used to explore short-term anomaly tracking and pre-earthquake early warning.The test results show:(1)linearity error: horizontal component 1: 1.08%;horizontal component 2: 1.29%;horizontal component 3: 1.99%;horizontal component 4: 1.03%;tilt component 1: 1.178%;Component No.2: 1.04%;Tilt component No.3: 0.87%;Tilt component No.4: 1.129%;in line with the linearity error of 2%.(2)Sensitivity:Comparing the output voltage signal of the strain gauge with the actual displacement measured by the high-precision capacitive sensor,the horizontal component No.1:0.392V/?m;the horizontal component No.2: 0.435 V/?m;the horizontal component No.3: 0.379V/?m;horizontal component 4: 0.532 V/?m;tilt component 1 : 0.385V/?m;tilt component 2: 0.724 V/?m;tilt component 3: 0.399 V/?m;tilt component 4:0.719V/?m;meet the requirements of the assessment indicators.(3)frequency band range: tested-the three-dimensional B frequency between 90Hz-95 Hz,meeting thedesign specification 50 Hz requirements,so the three-dimensional drilling strain gauge indicators are in line with national industry norms,and based on non-contact micro-displacement testing technology The test plan is feasible and more innovative,stable,accurate and reliable than the previous contact test method.This thesis mainly introduces the structure of the new three-dimensional borehole strain gauge and the test research of its important parameters from the contents of the six chapters,and expounds the non-contact micro-displacement test technology,as follows:The first chapter elaborates the research background of the structure and test method of borehole strain gauge at home and abroad,explains the development status and trend of the borehole strain test method,and proposes a new test method for the new three-dimensional borehole strain gauge.Based on the non-contact micro-displacement testing technology,the innovations in the design of this paper and the problems to be solved are also proposed.This chapter summarizes the development of the strain gauge test method,mainly proposes the framework of the new test method,paving a solid theoretical foundation for the following chapters.The second chapter elaborates on the type and development of the current micro-displacement testing technology,and analyzes the precise structure and working principle of the internal sensor of the new three-dimensional drilling strain gauge.This chapter mainly summarizes a variety of micro-displacement testing techniques,detailed the capacitive micro-displacement testing technology required in the new test system,and developed a new structure of the three-dimensional bore strain gauge sensor,which has certain innovation.The third chapter elaborates the test environment,test tube design and detailed test plan required to test the various parameters of the new the three-dimensional borehole strain gauge,and also carries out rigorous comparison and research.This section summarizes the equipment and environmental requirements that should be in the test lab to ensure a smooth test process.The fourth chapter elaborates the calibration principle and test plan included in the test of the three-dimensional borehole strain gauge,and introduces severalhigh-precision test sensors.In this chapter,we have developed a comprehensive test program for the testing of parameters such as linearity,sensitivity and frequency response range of the instrument and conducted rigorous testing and research.This chapter summarizes the high-precision test sensors used in the test research,and tests the important parameters of the the three-dimensional borehole strain gauge.The test results show that the data obtained from the test are more stable and accurate,and the research results of each parameter meet the national seismic industry.The norm,the conclusion is that this new test program is feasible and reliable.The fifth chapter elaborates the error analysis in the test research,and the corresponding error analysis is carried out on the results of the sensitivity test of the three-dimensional borehole strain gauge.In this chapter,the results of the experimental test are compared with the standard sensitivity,and the final result indicates the new test method.The test results are reliable and the error is within the range.And some measures to reduce the error are proposed,and the research is better tested later.The sixth chapter gives a detailed summary of the whole paper.Through the test of the important indicators of the instrument and the analysis of the test data,the following conclusions can be drawn: the non-contact micro-displacement technology is reliable,advanced and innovative.The analysis of each parameter test data shows that it is in line with national industry norms.The whole test plan is feasible and effective,and it is more stable,accurate and reliable than the previous contact test technology.Finally,not only the shortcomings and shortcomings in the test research process are proposed,but also the lightning protection design scheme of the Internet of Things is proposed in combination with the three-dimensional borehole strain gauge studied.It is hoped that the instrument will be safer and more perfect.