Omnidirectional Vector Geophone for Seismic Wave Field Divergence and Curl Detection
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Solution Overview
Problem
Existing seismic wave detection technologies cannot accurately detect full information of seismic wave fields, including divergence and curl, leading to significant errors in wave field separation and data fidelity, especially in terrestrial environments.
Innovation Solution
An omnidirectional vector geophone with a spatial structure of eight wave detectors arranged on a regular tetrahedron, allowing for the detection of full information including frequency, amplitude, phase, vibration direction, divergence, and curl of seismic waves, using a combination of cylindrical electromagnetic and flat sheet capacitor type detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single electromagnetic detector, capacitance detector or fiber optic strain detector is used, then the device structure is simple, but it cannot distinguish wave field vibration direction and cannot detect wave field divergence or curl
Solution Approach 1:
The patent divides the detection system into multiple detectors (at least three) arranged in specific spatial configurations. Each detector measures vibration in a specific direction, and through segmentation of the measurement functions, the system can reconstruct complete wave field information including divergence and curl that a single detector cannot provide.
Solution Approach 2:
The patent transitions from single-direction detection to multi-dimensional detection by arranging detectors in three-dimensional space. The spatial arrangement of detectors along different axes enables measurement of vibration in multiple dimensions, allowing calculation of divergence (volume expansion/compression) and curl (rotational motion) that are invisible to single-direction detectors.
2Measurement precision
If a three component detector is used to work out wave field vibration direction and amplitude, then the measurement capability is improved, but it still only measures translational vibration vector of a point and cannot detect nature, curl and divergence of vibration
Solution Approach 1:
The patent extends measurement from translational vibration only to include rotational vibration by adding curl detection capability. Through specific spatial arrangements of detectors and signal processing, the system measures not only the translational vibration vector but also the curl (rotational component) and divergence (volume change component) of the vibration field, providing complete characterization of vibration nature.
3Loss of information
If existing acquisition technology is used to detect information such as amplitude, frequency, phase, then the detection function is limited, but it cannot detect the spatial properties of wave motions
Solution Approach 1:
The patent segments the complex task of measuring spatial wave properties into multiple measurable components using distributed detectors. Each detector measures local vibration characteristics, and through spatial correlation and signal processing of these segmented measurements, the system reconstructs complete spatial motion properties including wave field divergence and curl that would be difficult to measure directly with a single device.
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
This solution enhances the separation purity of pressure and shear waves, improves signal-to-noise ratio, fidelity, and accuracy of seismic data, particularly in mountainous areas, and provides a comprehensive basis for elastic wave theory analysis.
Implementation Method 1
A method of converting mechanical motion into an electric signal applies nothing more than an electromagnetic detector
Implementation Method 2
A method of converting mechanical motion into an electric signal applies nothing more than an electromagnetic detector, a capacitance detector
Implementation Method 3
A method of converting mechanical motion into an electric signal applies nothing more than an electromagnetic detector, a capacitance detector, a piezoelectric detector
Data Source
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AI summary
The invention discloses an omnidirectional vector geophone, comprising: eight wave detectors and support structures thereof, the support structures are used for supporting the eight wave detectors such that bottom surfaces of each two wave detectors are on one of regular triangle surfaces of a regular tetrahedron, crossing points of working shafts of the two wave detectors that are on the same regular triangle surface that cross with the regular triangle surface are both on an angular bisector of an angle of the regular triangle surface and are symmetric with respect to the center of the regular triangle surface. In the invention, based on divergence and curl equations of field theory, a particular spatial motion full-vector detection structure is designed to realize detection of full information including frequency, amplitude, phase, vibration direction of the seismic wave field, especially divergence and curl of a wave force field, to form a completely new omnidirectional vector geophone structure.