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Amplitude value and phase self-calibration low-frequency rock physical measuring method and system

A technology of rock physics and measurement methods, which is applied in the direction of testing the hardness of materials and testing the strength of materials by applying repetitive force/pulsation force, etc. It can solve the problems that the rock stress-strain measurement method does not consider the electronic system, the deviation between the measured value and the real value, etc. , to eliminate the drift of amplitude and phase and improve the measurement accuracy

Active Publication Date: 2014-08-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] The existing rock stress-strain measurement method does not take into account that when the electronic system measures the amplitude and phase of a signal, it is often affected by many factors, such as changes in temperature, time and signal frequency, which will lead to a large difference between the measured value and the real value. deviation

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  • Amplitude value and phase self-calibration low-frequency rock physical measuring method and system
  • Amplitude value and phase self-calibration low-frequency rock physical measuring method and system
  • Amplitude value and phase self-calibration low-frequency rock physical measuring method and system

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[0083] According to one embodiment of the present invention, there are 13 preamplifier circuits, which respectively receive the reference signal from the sampling circuit 5 and 12 output signals from the optical fiber displacement sensor, and amplify them by 1000 times for acquisition by the ADC16. The operational amplifier chip adopts the instrumentation amplifier AD8429 of ADI Company. AD8429 is an ultra-low noise (1nV / √Hz) instrumentation amplifier. When the gain is 1000, it can still guarantee a bandwidth of 150kHz and a common-mode rejection ratio of 90dB. Its excellent distortion-free performance enables it to be used in demanding applications such as vibration analysis.

[0084] According to an embodiment of the present invention, the analog-to-digital conversion circuit also has 13 channels, and respectively converts the output signals of the 13 channels of preamplifier circuits into digital signals for FPGA 17 to buffer. The analog-to-digital conversion chip adopts AD...

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Abstract

The invention discloses an amplitude value and phase self-calibration low-frequency rock physical measuring method and system. A stratum environment is simulated, a metal supporting table for placing rock is used as a basis reference, and sensors are respectively arranged at multiple points at the side faces of the rock and the metal supporting table; a plurality of frequency points are selected in a frequency range of 2 Hz to 2 kHz, alternating voltage signals corresponding to the different frequencies but having the same phase and amplitude value are used as excitation sources of a calibration mode and a measurement mode; the voltage amplitude value and phase obtained by measurement are subjected to self calibration by adopting a real-time calibration and measurement way; and finally, rock elastic parameters and rock non-elastic parameters are calculated according to the self-calibrated amplitude value and phase. The system mainly comprises a signal exciting module, a mechanical module, a calibration and measurement switching module and a data acquisition and processing module. The method and the system can eliminate the electronic measuring system amplitude value and phase drifting brought by environmental parameter changes, and improves the measurement accuracy of the system amplitude value and phase.

Description

technical field [0001] The invention belongs to the technical field of petrophysical characteristic analysis, and in particular relates to a low-frequency petrophysical measurement system with amplitude and phase self-calibration. Background technique [0002] The importance of the study of petrophysical properties is that it can well explain the results of surface geophysical observations, provide scientific data for geological forward and inversion, and scale geophysical parameters. The physical properties of rocks are mainly determined by three factors: the properties of the minerals that make up the rocks, the thermodynamic environment (temperature and pressure) of the rocks, and the microstructure of the rocks (pores, cracks). Through the measurement of the physical properties of rock samples, the overall properties of the underground rock formations can be obtained, and the information on the distribution of oil, gas, minerals and elements under the formation can be ob...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/38G01N3/40
Inventor 周凯波陈寰黄臻刘颉曹攀辉
Owner HUAZHONG UNIV OF SCI & TECH
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