Seismic Sensor Overvoltage Protection Circuit for Lightning Grounding
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Solution Overview
Problem
Seismic sensor assemblies in reflection seismology are vulnerable to overvoltage conditions, particularly from lightning strikes, which can damage the sensor units and disrupt data acquisition.
Innovation Solution
The integration of overvoltage protection circuitry within the seismic sensor assembly, including a board with protection circuit components and a grounding mechanism, to safely dissipate excess voltage and protect the sensor circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If seismic sensor assembly is deployed in field conditions, then data acquisition capability is improved, but vulnerability to lightning strikes and overvoltage damage increases
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by converting the harmful lightning strike energy into a beneficial grounding path. The overvoltage protection circuitry includes components like gas discharge tubes and metal oxide varistors that safely channel the excessive voltage from lightning strikes through a designated path to ground, protecting the sensitive sensor electronics while maintaining field deployment capability.
Solution Approach 2:
The patent applies the 'Intermediary' principle by introducing overvoltage protection circuitry as an intermediary between the external environment (lightning strikes) and the sensitive sensor circuitry. This intermediary layer includes protection components that absorb or redirect harmful voltage surges, allowing the sensor assembly to operate in field conditions without direct exposure to lightning damage.
2Reliability
If overvoltage protection circuitry is added to seismic sensor assembly, then protection against lightning strikes is improved, but device complexity increases
Solution Approach 1:
The patent applies the 'Merging' principle by integrating the overvoltage protection circuitry directly onto the existing sensor circuit board rather than as a separate assembly. The protection components (gas discharge tubes, metal oxide varistors, diodes) are mounted on the same circuit board as the sensor electronics, sharing common grounding paths and structural support, thereby reducing overall system complexity despite adding protection functionality.
Solution Approach 2:
The patent applies the 'Universality' principle by designing the overvoltage protection circuitry to handle multiple types of electrical threats simultaneously - lightning strikes, electrostatic discharge, and voltage spikes from power fluctuations. The same protection components and grounding structure provide comprehensive protection against various overvoltage conditions, reducing the need for separate protection systems for each threat type.
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 implementation of overvoltage protection circuitry effectively reduces the risk of damage from lightning strikes, ensuring continuous operation and reliable data acquisition in seismic surveys.
Implementation Method 1
electrically coupling a wire of the overvoltage protection circuit board to a ground shield via a coupling mechanism that couples the ground shield to a housing
Data Source
AI summary
A seismic sensor assembly can include a housing that defines a longitudinal axis; a sensor; sensor circuitry operatively coupled to the sensor; and overvoltage protection circuitry electrically coupled to the housing.