Coupling Evaluation Geophone Impulse Response Measurement
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Solution Overview
Problem
Existing ground-geophone coupling systems fail to accurately model impulse responses due to transient excitation limitations, which are essential for seismic exploration, as conventional equipment like shaking tables and exciters cannot replicate the required impulse across the entire frequency range.
Innovation Solution
A coupling evaluation geophone is designed with multiple piezoelectric ceramic crystals placed strategically on a geophone, utilizing barium titanate, lead zirconate titanate, and modified lead zirconate titanate materials to enhance signal output and detect impulse responses, combined with signal processing techniques to eliminate ambient noise and ground-geophone coupling effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional equipment like shaking tables and exciters are used for impulse excitation, then approximation in a certain frequency band range is achieved, but the requirement of modeling an impulse obtained from a geophone in seismic exploration cannot be fulfilled
Solution Approach 1:
The patent replaces conventional mechanical impulse excitation equipment (shaking tables, exciters, vibration machines, exciting hammers) with a piezoelectric ceramic crystal-based excitation system. The piezoelectric crystal converts electrical voltage signals into mechanical vibrations, enabling impulse excitation across a broader frequency range while maintaining measurement accuracy for ground-geophone coupling characterization.
Solution Approach 2:
The patent changes the excitation method from mechanical impact to piezoelectric vibration by applying voltage signals to the piezoelectric ceramic crystal. This parameter change enables the system to generate impulse responses across an extended frequency range while maintaining the ability to accurately measure ground-geophone coupling effects.
2Measurement precision
If multiple piezoelectric ceramic crystals are added to the geophone, then impulse response detection capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection function by using multiple piezoelectric ceramic crystals positioned at different locations on the geophone (first crystal on the body, second crystal on the housing, third crystal on a lateral side). Each crystal detects specific vibration components, and their combined outputs provide comprehensive impulse response characterization while maintaining manageable system complexity through modular arrangement.
Solution Approach 2:
The multiple piezoelectric ceramic crystals serve multiple functions: the first crystal on the geophone body detects primary impulse responses, the second crystal on the housing detects coupling effects, and the third crystal on the lateral side detects directional vibrations. This multi-functional arrangement enables comprehensive ground-geophone coupling evaluation without requiring separate measurement systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The geophone effectively obtains and processes impulse responses, improving data fidelity, Signal/Noise ratio, and resolution, enabling accurate earthquake data analysis by isolating ground-geophone coupling effects through specific signal processing and deconvolution methods.
Implementation Method 1
A coupling evaluation geophone comprises a first piezoelectric ceramic crystal and a geophone. The first piezoelectric ceramic crystal is provided at a top end of the geophone.
Data Source
AI summary
The present disclosure discloses a coupling evaluation geophone, comprising piezoelectric ceramic crystal 1, 2 and 3, a geophone 4 and a relevant supplying circuit. Three piezoelectric ceramic crystals 1, 2 and 3 are respectively provided on the top and two lateral sides of the geophone 4. By processing measurement data derived from the coupling evaluation geophone, a ground-geophone coupling effect is obtained at a corresponding embedment point of the coupling evaluation geophone. An effect of the ground-geophone coupling on an earthquake data can be eliminated by calculation. Data detected by the coupling evaluation geophone is improved in fidelity, Signal/Noise ratio and resolution.