Passive Sensor Detection System Using Resonant Mechanical Sensors
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Solution Overview
Problem
Current unattended sensor technologies for IoT applications face limitations due to high power consumption from continuous signal monitoring, which reduces their operational lifetime and increases complexity and cost, despite efforts to reduce power consumption with low-power signal detection and processing electronics.
Innovation Solution
A passive sensor detection system utilizing an array of resonant mechanical sensors connected in series, each tuned to detect specific signature frequencies of a target signal, with a transmitter powered only when the signal is detected, significantly reducing power consumption and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wideband fast Fourier transform (FFT) based signal processing is used for signature extraction and identification, then signal detection capability is improved, but power consumption increases significantly
Solution Approach 1:
The patent segments the continuous signal processing operation into discrete frequency components, with each resonant mechanical sensor tuned to detect a specific signature frequency. This segmentation allows the system to monitor only relevant frequencies rather than processing the entire spectrum continuously, thereby reducing power consumption while maintaining detection capability.
Solution Approach 2:
The transmitter is activated periodically only when a target signal is detected by the resonant mechanical sensors, rather than operating continuously. This periodic activation significantly reduces power consumption while ensuring that signal transmission occurs at appropriate moments for detection and communication.
2Power
If active power is used for signal detection and processing, then signal processing capabilities are improved, but operational lifetime decreases
Solution Approach 1:
The resonant mechanical sensors are designed to passively detect signals at their resonant frequencies without requiring active power for the detection function. The sensors utilize their natural mechanical resonance properties to detect target signals, eliminating the need for powered signal processing electronics and thereby extending operational lifetime.
Solution Approach 2:
The transmitter operates periodically only when detection occurs, rather than continuously. This periodic operation mode maintains necessary communication capabilities while dramatically reducing overall power consumption and extending the operational lifetime of battery-powered sensor nodes.
3Reliability
If continuous environmental monitoring is performed, then detection reliability is improved, but power consumption increases
Solution Approach 1:
Each resonant mechanical sensor is tuned to detect a specific signature frequency relevant to the target, rather than monitoring all environmental frequencies. This localized detection approach maintains reliability for detecting the specific target while reducing power consumption by ignoring irrelevant frequency bands.
Solution Approach 2:
The patent employs mechanical vibration and resonance of the sensor elements to detect target signals. The resonant mechanical sensors naturally respond to specific frequencies through vibration, enabling reliable detection without requiring active electronic signal processing and continuous power consumption.
4Measurement precision
If application-specific integrated circuit (ASIC) chips are used, then signal detection performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex electronic signal processing systems with simple resonant mechanical sensors. Instead of using ASIC chips for frequency analysis, the system uses the natural mechanical resonance properties of sensor elements to detect specific frequencies, thereby reducing device complexity and cost while maintaining detection performance.
Solution Approach 2:
The patent changes the detection parameter from electronic signal processing to mechanical resonance frequency. By tuning the mechanical sensors to specific resonant frequencies corresponding to target signatures, the system achieves effective detection without requiring complex electronic circuits, reducing both complexity and cost.
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 system prolongs the operational lifetime of unattended sensors, reduces costs, and enables long-term sensing capabilities by only activating the transmitter upon detection of the target signal, minimizing false alarms and power usage.
Implementation Method 1
an array of resonant mechanical sensors connected in series, with each of the resonant mechanical sensors configured to detect respectively different signature frequencies of a signal generated by a target of interest
Data Source
AI summary
A passive sensor detection system comprises an array of resonant mechanical sensors connected in series, with each of the resonant mechanical sensors configured to detect respectively different signature frequencies of a signal generated by a target of interest. A transmitter is operatively coupled to the array of resonant mechanical sensors, and a power supply is coupled to the array of resonant mechanical sensors and the transmitter. When the array of resonant mechanical sensors are triggered by the signal generated by the target of interest, the transmitter is powered on to transmit a signal indicating the detection of the target of interest.