Seismic Sensor Frequency Threshold Classification

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional seismic sensors inaccurately determine whether measured vibrations are caused by earthquakes or noise, especially when connected to fluid supply pipes and vibrations occur during fluid flow.

Innovation Solution

The seismic sensor employs an acceleration measurement unit, an acceleration waveform generation unit, a frequency sensing unit, and an earthquake determination unit. It classifies acceleration waveforms based on frequency thresholds, excluding waveforms with frequencies above a certain threshold to accurately distinguish between earthquake and non-earthquake vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the seismic sensor determines earthquakes based on all detected vibrations without frequency filtering, then the detection sensitivity is improved, but false positives from high-frequency noise (such as fluid flow vibrations) increase

Engineering Contradiction:

Improveearthquake detection accuracyVSAvoidfalse positive rate

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies parameter changes by introducing frequency as a discrimination parameter. The earthquake determination unit classifies acceleration waveforms based on their frequency characteristics, comparing the sensed frequency against a threshold value. This allows the system to distinguish between low-frequency earthquake vibrations and high-frequency noise vibrations, thereby reducing false positives while maintaining detection sensitivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the acceleration waveforms into different categories based on frequency characteristics. By dividing waveforms into those above and below a specific frequency threshold, the system can apply different evaluation criteria to each segment, ensuring that high-frequency noise vibrations are excluded from earthquake determination while low-frequency earthquake vibrations are properly detected

Inventive Principle:

Principle #1Segmentation

2Reliability

If the seismic sensor excludes high-frequency vibrations from earthquake determination, then false positives from noise are reduced, but the ability to detect all earthquake vibrations may be compromised

Engineering Contradiction:

Improvefalse positive rateVSAvoidearthquake detection accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent uses frequency as a discrimination parameter to differentiate between earthquake and non-earthquake vibrations. By setting an appropriate frequency threshold, the system excludes high-frequency noise while preserving low-frequency earthquake signals, thus improving reliability without compromising detection accuracy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces simple mechanical vibration detection with a more sophisticated frequency-based analysis system. The frequency sensing unit and earthquake determination unit together form an analytical system that evaluates vibration characteristics, substituting raw mechanical detection with intelligent frequency-based discrimination

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 highly accurate determination of whether an earthquake is occurring, reducing false positives from noise or fluid-related vibrations.

Implementation Method 1

an acceleration measurement unit that detects vibration and measures the acceleration of the vibration

Methodology Applied

Scientific EffectInertial measurement: Inertia

Implementation Method 2

a frequency sensing unit that senses the frequency of the acceleration waveform generated by the acceleration waveform generation unit

Methodology Applied

Scientific EffectFrequency analysis:

Data Source

PatentUS12332395B2Seismic sensor, earthquake detection method, and earthquake detection program

Publication Date: 2025.06.17 OMRON CORP

AI summary

A seismic sensor 10 comprises an acceleration acquisition unit 21, an acceleration waveform generation unit 22, a frequency sensing unit 24, and an earthquake determination unit 25. The acceleration acquisition unit 21 detects vibration and measures the acceleration of the vibration. The acceleration waveform generation unit 22 generates an acceleration waveform that indicates the relation between the elapsed time and the acceleration measured by the acceleration acquisition unit 21. The frequency sensing unit 24 senses the frequency of the acceleration waveform generated by the acceleration waveform generation unit 22. The earthquake determination unit 25 determines whether or not there is an earthquake by classifying acceleration waveforms into those in which the frequency sensed by the frequency sensing unit 24 is above a specific threshold and those in which the frequency is below the specific threshold, and excluding any acceleration waveforms in which the frequency is above the specific threshold.