RF Sensor System Using Reflected Wave Analysis for Power Optimization
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Solution Overview
Problem
Existing RFID systems waste power and operational resources due to the need for periodic transmission of information requesting signals, even when no tags are present in the communication region, leading to inefficient hardware usage and increased costs.
Innovation Solution
A radio frequency sensor system that uses an oscillating circuit, signal coupler, signal detector, and controller to analyze reflected wave signals from objects within the communication region, differentially employing frequency clocks and power supply based on the presence or absence of objects, thereby optimizing resource usage without additional monitoring systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reader periodically transmits information requesting signals to establish RFID communication channel with tags, then the communication reliability is improved, but the power consumption increases and hardware resources are wasted
Solution Approach 1:
The reader transmits information requesting signals periodically at predetermined intervals instead of continuously, allowing the system to maintain communication reliability while reducing power consumption and hardware resource usage during idle periods when no tags are present
Solution Approach 2:
The system uses the RFID tags themselves to reflect radio waves for detection purposes, eliminating the need for separate detection systems. The tags serve dual functions: communication carriers and detection targets, thereby reducing overall system complexity and power consumption
2Measurement precision
If additional detectors such as optical sensor and vibration sensor are employed to monitor communication region, then the detection accuracy is improved, but the device complexity increases and installation costs increase
Solution Approach 1:
The RFID communication system and object detection function are merged into a single integrated system. The same radio frequency signals used for communication also serve as detection waves, allowing the reader to detect tag presence through reflected wave analysis without requiring separate detection hardware
Solution Approach 2:
The RFID reader performs multiple functions: establishing communication channels with tags and detecting object presence in the communication region. The system uses a single device structure that can both transmit information requesting signals and analyze reflected waves for detection purposes
3Speed
If the reader transmits information requesting signal under high power to collect information about unspecified number of tags, then the communication range is improved, but the power waste increases
Solution Approach 1:
The reader dynamically adjusts its operation mode based on detected tag presence. When tags are detected through reflected wave analysis, the reader activates full communication mode with appropriate power levels. When no tags are present, the reader reduces to idle mode with minimal power consumption, avoiding unnecessary high-power transmission
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 allows for precise detection of object movement using reflected wave technology, reducing power waste and operational resource utilization, and simplifies the detection system with a cost-effective circuit and software process.
Implementation Method 1
a radio frequency transmission terminal and a radio frequency reception terminal... an oscillating circuit part for generating a plurality of frequency clocks
Implementation Method 2
a signal detector for detecting change of the coupled signal according to movement of an object and generating a detection signal
Data Source
AI summary
The embodiment provides a radio frequency sensor system comprising a radio frequency transmission terminal and a radio frequency reception terminal. The system comprises an oscillating circuit part for generating a plurality of frequency clocks, a signal coupler for coupling signals exiting on the radio frequency reception terminal, a signal detector for detecting change of the coupled signal according to movement of an object and generating a detection signal, and a controller for analyzing the detection signal and differentially employing the frequency clock according to the analysis result.