Sensor Apparatus Frequency-Domain Interference Attenuation
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Solution Overview
Problem
Existing sensor apparatuses with multiple detection elements often experience decreased detection accuracy due to misalignment of detection axes and interference signals caused by close drive frequencies among sensor devices.
Innovation Solution
A sensor apparatus comprising two or more detection elements, a storage section for drive frequencies, and a processing section that generates a statistical signal from detection signals, attenuates interference signals in specific frequency bands based on drive frequencies, and outputs the signal as detection data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensor devices are used to improve measurement coverage and reliability, then the detection capability is enhanced, but interference signals between devices cause noise and reduce detection accuracy
Solution Approach 1:
The patent extracts and removes interference signals from the detection data by identifying frequency components that correspond to drive frequencies of multiple sensor devices. The processing section separates the useful detection signals from the harmful interference signals based on their frequency characteristics, allowing the system to maintain the benefits of multiple sensors while eliminating the noise they generate.
Solution Approach 2:
The patent introduces a frequency-domain filtering mechanism as an intermediary between the sensor devices and the final detection output. This intermediary processing layer analyzes the frequency spectrum of detection signals and selectively attenuates components corresponding to interference frequencies, thereby mediating between the multiple sensor inputs and the final measurement output to resolve conflicts between reliability and precision.
2Productivity
If drive frequencies of multiple detection elements are kept close to enable synchronized operation, then operational efficiency is improved, but interference noise increases and detection accuracy decreases
Solution Approach 1:
The patent converts the harmful interference signals into useful information by utilizing their frequency characteristics. Instead of simply rejecting all signals close in frequency, the system identifies and removes only the interference components by comparing detected frequencies against stored drive frequency data, thereby preserving operational efficiency while eliminating the specific harmful effects of frequency proximity.
Solution Approach 2:
The patent implements a feedback mechanism where the processing section continuously monitors the frequency spectrum of detection signals and compares them against the stored drive frequencies. This feedback loop enables real-time identification and attenuation of interference signals, allowing the system to maintain close drive frequencies for efficiency while dynamically correcting for the resulting noise.
3Device complexity
If detection axes of multiple sensor devices are not precisely aligned, then device complexity is reduced, but detection accuracy deteriorates due to misalignment errors
Solution Approach 1:
The patent changes the parameter domain from spatial alignment to frequency domain processing. Instead of physically aligning detection axes with high precision, the system compensates for misalignment by analyzing frequency characteristics of detection signals and adjusting the digital signal processing parameters accordingly, thereby reducing mechanical alignment complexity while maintaining measurement accuracy.
Data Source
AI summary
A sensor apparatus includes: two or more detection elements; a storage section configured to store respective drive frequencies of the two or more detection elements; and a processing section configured to, in accordance with respective detection signals output from the two or more detection elements, obtain a statistical signal by making statistics of the detection signals, attenuate an interference signal in a frequency band in accordance with the respective drive frequencies from the statistical signal, thereby outputting detection data.