Passive Wireless Sensor Detection Using Leaky Coaxial Cable
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Solution Overview
Problem
Existing wireless temperature measurement systems for wind-driven generators face challenges such as large installation space requirements, high maintenance costs, and limited scalability due to battery replacement needs and the requirement for multiple wireless charging units and antennas.
Innovation Solution
A detection system utilizing passive wireless sensors driven by a leaky coaxial cable that emits electromagnetic waves, allowing for multi-point temperature monitoring without the need for batteries or extensive installation space, and enabling increased sensor configurations through shared channels and extended antenna distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless temperature measurement units with batteries are used, then temperature monitoring can be achieved, but installation space increases and maintenance costs increase due to regular battery replacement
Solution Approach 1:
The patent extracts and removes the battery component from the temperature measurement system, replacing it with a passive wireless sensor that harvests energy from the electromagnetic field emitted by the leaky coaxial cable. This eliminates the need for battery installation space and associated maintenance while maintaining temperature monitoring capability.
Solution Approach 2:
The passive wireless sensor implements self-service by harvesting its own operating energy from the electromagnetic field emitted by the leaky coaxial cable. The sensor does not require external power supply or battery replacement, as it continuously extracts energy from the cable's electromagnetic field to power its temperature sensing and wireless communication functions.
2Use of energy by moving object
If wireless charging temperature measurement units are used, then power supply is provided, but installation space increases and system complexity increases due to multiple charging units and signal processing units
Solution Approach 1:
The leaky coaxial cable serves multiple functions simultaneously: it provides electromagnetic signal transmission for data communication and emits electromagnetic energy to power the passive wireless sensors. This multi-functionality eliminates the need for separate wireless charging units and signal processing units, reducing system complexity while maintaining power supply capability.
Solution Approach 2:
The patent merges the power supply function and signal transmission function into a single component - the leaky coaxial cable. Instead of using separate wireless charging units and signal processing units, the cable's electromagnetic field serves both purposes, significantly simplifying the system architecture.
3Volume of moving object
If SAW temperature sensors are used, then small sensor size is achieved, but the number of sensors is limited by antenna distance requirements and signal sensitivity to environmental arrangement
Solution Approach 1:
The leaky coaxial cable acts as an intermediary that provides both power and communication channels to multiple passive wireless sensors along its length. This intermediary structure eliminates the need for individual antennas for each sensor, allowing numerous sensors to be deployed along the cable without distance constraints, thereby increasing system adaptability and sensor capacity.
4Quantity of substance
If multiple antennas are used for multiple sensors, then more measurement points are covered, but installation space increases and cost increases
Solution Approach 1:
The leaky coaxial cable is segmented into multiple sections along its length, with each section capable of powering and communicating with passive wireless sensors at different locations. This segmentation allows multiple sensors to share a single cable infrastructure, eliminating the need for multiple separate antennas and reducing installation space requirements while maintaining the ability to monitor multiple points.
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 solution reduces installation space, maintenance costs, and improves detection accuracy by allowing for more sensors to be configured without battery replacement and minimizing the need for multiple antennas, enhancing the system's efficiency and scalability for multi-point measurements.
Implementation Method 1
the leaky coaxial cable can emit electromagnetic waves to drive the plurality of passive wireless sensors and can receive the detection signals sent by the passive wireless sensors
Data Source
AI summary
A detection system and a wind driven generator. The detection system includes: a plurality of passive wireless sensors respectively provided at the corresponding positions to be detected, which are used for obtaining detection signals of the positions to be detected; and a leaky coaxial cable provided along the position to be detected, wherein the leaky coaxial cable can emit electromagnetic waves to drive the plurality of passive wireless sensors, and can receive the detection signal sent by the passive wireless sensors. The detection system can save installation space, as well as reduce maintenance costs since there is no need to replace a battery regularly, and when conducting multi-point measurements, costs are reduced and the number of passive wireless sensors that the system can configure is increased.