Seismic Sensor Electric Levitation High Temperature
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Solution Overview
Problem
Conventional geophones face challenges in measuring low-frequency seismic signals due to large natural displacement and spring creep at high temperatures, especially in deep boreholes, which affects their accuracy and longevity.
Innovation Solution
The use of electric levitation to maintain the moving coil in a central position within the magnetic field, eliminating the need for pre-stressed springs and allowing for continuous operation in high-temperature environments, combined with a digital signal processor for real-time feedback and calibration to adjust for temperature and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-stressed springs are used to centralize the moving coil in conventional geophones, then the coil can be maintained at a neutral position, but spring creep occurs at high temperatures reducing reliability
Solution Approach 1:
The patent replaces the mechanical spring system with an electrical levitation system. Instead of using pre-stressed springs to centralize the moving coil, an electrical current is applied to the coil to generate a magnetic force that counteracts gravitational force, thereby eliminating spring creep issues at high temperatures while maintaining coil centralization.
2Measurement precision
If low natural frequency is used to detect low-frequency seismic signals, then measurement precision improves, but natural displacement becomes large causing mechanical issues
Solution Approach 1:
The patent replaces the mechanical spring-mass system with an electrical levitation system. This substitution allows the moving coil to be positioned centrally using electrical forces rather than mechanical springs, enabling low natural frequency operation without the large natural displacement that would otherwise occur in conventional mechanical systems.
3Reliability
If electric levitation is used to maintain coil position, then spring creep is eliminated, but additional electrical components and control systems are required
Solution Approach 1:
The patent implements a feedback control system where the moving coil's position is continuously monitored and adjusted. The system uses the coil's own motion to generate feedback signals that automatically adjust the levitation current, making the system self-regulating and reducing the need for complex external control mechanisms.
4Ease of operation
If the moving coil is kept stationary relative to the housing, then seismic signal detection is simplified, but the coil cannot respond to particle motion
Solution Approach 1:
The patent creates a dynamic system where the moving coil is levitated against gravitational force but remains free to move in response to seismic particle motion. The electrical levitation force counteracts gravity while allowing the coil to dynamically respond to external seismic forces, enabling both simplified detection and accurate measurement.
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 approach enables the acquisition of low-frequency seismic signals with improved accuracy and durability, reducing the impact of temperature and tilt on geophone performance, and extends the operational life of seismic sensors.
Implementation Method 1
When the coil moves in the magnetic field, a voltage is induced in the coil which can be output as a signal
Implementation Method 2
a moving coil within the housing structured and arranged so as to be fixed in a radial direction relative to the housing and movable in an axial direction thereof. An electrical circuit is configured or designed for providing an electrical signal to the seismic sensor... applies the electrical signal to the seismic sensor such that the moving coil is levitated against gravitational force
Data Source
AI summary
Methods and systems utilizing seismic sensors configured or designed for use in seismic signal detection. An electrical current is applied to a seismic sensor such that the moving coil is located at a neutral position relative to the magnetic field in the seismic sensor to compensate for gravitational acceleration.