Closed-Space Wireless Sensors With Time-Slot Power and Data Control
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Solution Overview
Problem
In closed spaces, simultaneous operation of multiple wireless sensors leads to degraded communication quality and unstable operation due to varying reception sensitivities and potential interference.
Innovation Solution
A closed-space sensor system utilizing a power transmitter that emits electromagnetic waves to wirelessly power sensors, each equipped with a power storage unit, which starts operation when the storage reaches a common threshold, and employs frequency channel management to ensure stable operation by adjusting transmission frequencies and positions to accommodate varying reception sensitivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple wireless sensors are driven simultaneously in a closed space, then the quantity of sensors deployed increases, but communication quality degrades and operation becomes unstable
Solution Approach 1:
The patent implements periodic action by controlling sensors to operate in alternating cycles rather than simultaneously. The controller manages transmission cycles of different sensors sequentially, allowing each sensor to complete its measurement and transmission before the next sensor activates. This periodic operation eliminates communication interference while maintaining the ability to monitor multiple sensors, thus resolving the contradiction between increasing sensor quantity and maintaining operational stability.
2Measurement precision
If sensors are arranged at different positions in a closed space, then measurement coverage improves, but reception sensitivities vary causing unstable operation
Solution Approach 1:
The patent applies local quality by assigning different transmission cycles to sensors based on their specific positions and reception characteristics. Rather than treating all sensors uniformly, the controller identifies sensors with lower reception sensitivity due to their positions and schedules them in specific time slots. This localized adjustment of operation timing compensates for position-induced sensitivity variations, enabling comprehensive spatial coverage while maintaining reliable operation across all sensor locations.
3Device complexity
If wireless sensors are used instead of wired sensors, then wiring complexity is eliminated, but power transmission and communication interference occur in closed spaces
Solution Approach 1:
The patent uses periodic action to mitigate electromagnetic interference by implementing time-division multiplexing. Sensors and the power transmitter operate in alternating time slots rather than simultaneously. During power transmission cycles, sensors are in receive-only mode, and during sensor transmission cycles, power transmission is suspended. This periodic separation eliminates harmful electromagnetic interference while preserving the wiring-free advantage of wireless sensors.
Solution Approach 2:
The patent applies dynamics by making the system's operation mode changeable based on the current time slot. The controller dynamically switches between power transmission mode and sensor data transmission mode, adapting the system's behavior to the current operational phase. This dynamic control allows the system to eliminate interference harmful effects while maintaining the simplicity of wireless deployment.
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 stable operation of multiple sensors by managing power transmission frequencies and positions, ensuring continuous measurement and data transmission without interference.
Implementation Method 1
a power transmitter 40 of an electromagnetic wave irradiator 140 that emits an electromagnetic wave
Implementation Method 2
each of which includes an antenna, converts the electromagnetic wave received via the antenna into electric power
Data Source
AI summary
A closed-space sensor system that enables stable operation in a closed space is provided.The closed-space sensor system includes: a power transmitter of an electromagnetic wave irradiator emitting an electromagnetic wave; and a plurality of sensors, each of which includes an antenna and is driven by converting the electromagnetic wave received via the antenna into electric power. Each of the plurality of sensors may further include a power storage unit, and each of the plurality of sensors may start to be driven when a power storage amount in the power storage unit reaches a drive start threshold value that is common to the plurality of sensors. The power transmitter of the electromagnetic wave irradiator and the plurality of sensors may be arranged in a closed space.