Resonant Switch Sensor for Low Power Environmental Monitoring
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Solution Overview
Problem
Battery-powered environmental sensors often consume excessive power in standby mode, leading to frequent battery replacement and increased maintenance costs, as they remain active for extended periods without detecting events.
Innovation Solution
Development of electromechanical resonant switches that respond to environmental stimuli, such as vibrations or acoustic signals, to intermittently connect power input to output terminals, allowing sensors to remain in a low-power state until an event is detected, using integrator circuits to provide a detection signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors remain in standby mode to detect events, then detection capability is maintained, but power consumption increases
Solution Approach 1:
The sensor system uses periodic sampling of environmental parameters instead of continuous monitoring. The processor wakes from low-power sleep mode at scheduled intervals to take measurements, then returns to sleep mode. This periodic operation maintains detection capability while dramatically reducing average power consumption compared to continuous standby operation.
Solution Approach 2:
The sensor system automatically manages its own power states without external intervention. The processor autonomously transitions between active and sleep modes based on detection needs, and the system self-regulates its power consumption by only activating components when environmental changes warrant measurement or communication.
2Speed
If sensors continuously monitor environmental parameters, then event detection is immediate, but battery life decreases
Solution Approach 1:
The system implements periodic sampling with adjustable intervals, allowing fast detection of significant events while extending battery life through reduced operational duty cycle. The processor samples environmental parameters at scheduled intervals rather than continuously, waking from sleep mode only when needed to measure and potentially communicate data.
Solution Approach 2:
The system maintains continuous monitoring capability through persistent event detection algorithms that can identify significant changes even during low-power intervals. The processor remains in a low-power state but can quickly wake and respond to events, providing continuous useful action without continuous full-power operation.
3Reliability
If sensors wake frequently to check for events, then detection responsiveness is maintained, but power consumption increases
Solution Approach 1:
The sensor system uses periodic wake-up cycles with configurable intervals to check for events, balancing responsiveness with power savings. Instead of continuous monitoring or fixed frequent wake-ups, the system samples at optimized intervals that maintain adequate detection responsiveness while minimizing the frequency of high-power active states.
Solution Approach 2:
The system employs feedback mechanisms where detection results and environmental conditions influence future wake-up frequency. When no significant events are detected, the system can extend intervals between wake-ups to save power. When events are detected or conditions warrant closer monitoring, the system dynamically adjusts its sampling frequency to maintain responsiveness.
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 solution enables sensors to remain in a low-power state until an event occurs, reducing power consumption and extending battery life, thereby decreasing maintenance costs and increasing operational efficiency.
Implementation Method 1
The mechanical element is configured to vibrate at a resonant frequency
Implementation Method 2
The mechanical element may include at least one electrostatic tuning element configured to apply an electrostatic force that alters the resonant frequency of the mechanical element
Implementation Method 3
The integrator circuit is configured to receive and integrate energy pulses from the power input terminal to provide a detection signal at the sensor output terminal
Data Source
AI summary
An environmental physical sensor is provided that includes a power input terminal, a sensor output terminal, and a resonant switch. The resonant switch includes a mechanical element that is responsive to an environmental stimulus and is coupled to an electrical switch. The electrical switch is operable between an open position and a closed position and electrically connects the power input terminal to the sensor output terminal when in the closed position. The mechanical element is configured to intermittently actuate the electrical switch into the closed position responsive to the environmental stimulus.