Seismic Sensor Multi-Mode Acceleration Logging
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Solution Overview
Problem
Conventional seismic sensors face challenges in reducing power consumption while maintaining accurate earthquake detection and data acquisition, particularly for battery-powered devices that need to operate for extended periods without frequent battery replacements.
Innovation Solution
A seismic sensor with a logger function that switches between three operation modes based on measured acceleration thresholds, minimizing power usage by saving data only when necessary, and utilizing an information processing device in an OFF state during low-power modes to detect micro-vibrations before an earthquake occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If acceleration data is constantly acquired and saved before earthquake detection, then data acquisition capability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic switching between three operation modes (simple earthquake detection mode, earthquake detection mode, and earthquake measurement mode) based on real-time acceleration threshold comparisons. This dynamic adaptation allows the system to optimize power consumption while maintaining data acquisition capability when needed, directly resolving the contradiction between continuous data logging and power savings.
Solution Approach 2:
The system changes operational parameters (data saving enable/disable, measurement frequency, processing intensity) based on the detected acceleration level. By adjusting these parameters according to the current operational mode, the system achieves low power consumption during normal operation while preserving the ability to acquire and save data when earthquake conditions are detected.
2Loss of information
If the sensor operates in a measurement mode with data saving functionality, then data acquisition capability is improved, but operation duration is reduced
Solution Approach 1:
The system employs periodic monitoring of acceleration thresholds and transitions between operation modes based on these periodic checks. By periodically evaluating the need for data acquisition versus power consumption, the system extends battery operation duration while maintaining the capability to log data when earthquake conditions arise.
Solution Approach 2:
The patent implements partial data acquisition by only saving data when acceleration exceeds the first threshold value, rather than continuously saving all data. This partial action approach reduces power consumption and extends battery life while still capturing the critical earthquake event data when it occurs.
3Measurement precision
If the sensor uses a micro controller unit for arithmetic processing, then earthquake detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments the operational workload by dividing it into three distinct modes with different processing intensities. The simple earthquake detection mode uses minimal processing, while the earthquake detection and measurement modes use progressively more sophisticated arithmetic processing. This segmentation allows the system to maintain high detection accuracy when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The system dynamically adjusts the level of arithmetic processing performed by the micro controller unit based on the current operational mode. By switching between simple comparison operations and more complex spectrum intensity calculations only when necessary, the system maintains earthquake detection accuracy while significantly reducing average power consumption.
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
Enables reliable low-power earthquake detection and data acquisition before and during seismic events, reducing battery replacement frequency and extending device operation life.
Implementation Method 1
a vibration acceleration sensor 11 that outputs a vibration acceleration signal corresponding to vibration acceleration
Data Source
AI summary
A seismic sensor may include a simple earthquake detection mode in which measured acceleration data is not saved, and which mode is continued in a case in which the measured acceleration is equal to or less than a predetermined first threshold value. An earthquake detection mode may further be included in which the measured acceleration data is saved, and which mode is continued in a case in which the acceleration measured in the simple earthquake detection mode is greater than the first threshold value and equal to or less than a second threshold value that is greater than the first threshold value. An earthquake measurement mode may further be included in which the acceleration data and a spectrum intensity (SI) value are measured and saved, and which mode is continued in a case in which the acceleration measured in the earthquake detection mode is greater than the second threshold value.