Wireless Material Sensing via Multipath Channel Analysis
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Solution Overview
Problem
Conventional systems for material identification using radio-frequency signals are limited by the need for specialized hardware, are not portable, and can only penetrate certain materials, restricting their application to fixed setups and specific objects.
Innovation Solution
A wireless material sensing system that processes wireless channel information to determine the type of a target material by transmitting and receiving signals through a multipath channel, using a processor to analyze channel information such as CSI, CIR, and RSSI from multiple transmit and receive antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional systems use specialized hardware for material identification, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by enabling standard wireless communication hardware to perform material identification functions. The system uses existing transceivers and antennas for wireless communication to also sense material properties through wireless channel characteristics, eliminating the need for specialized detection hardware while maintaining identification capability.
Solution Approach 2:
The patent uses wireless channel information as an intermediary to indirectly detect material properties. Instead of directly measuring material characteristics with specialized sensors, the system analyzes the modulation of wireless signals by material properties (reflection, refraction, absorption) to infer material type and characteristics.
2Measurement precision
If conventional systems use fixed setups for material detection, then measurement precision is improved, but adaptability and portability deteriorate
Solution Approach 1:
The system enables portable devices with standard wireless communication capabilities to perform material identification in various locations. The same wireless transceiver used for communication also serves as the sensing device, allowing the system to be deployed anywhere without requiring fixed specialized infrastructure.
Solution Approach 2:
The patent enables dynamic deployment of material detection capabilities in various locations and conditions. The system can be moved and reconfigured as needed, adapting to different environments and applications while maintaining detection accuracy through analysis of wireless channel characteristics specific to each location.
3Measurement precision
If conventional systems use specialized hardware, then measurement precision is improved, but ease of manufacture and cost deteriorate
Solution Approach 1:
The patent replaces expensive specialized detection hardware with inexpensive standard wireless communication components. The system uses off-the-shelf transceivers and antennas that are already mass-produced and affordable, significantly reducing manufacturing costs while achieving the same measurement precision through software-based analysis of wireless channel characteristics.
Solution Approach 2:
The system replaces physical specialized sensors with electromagnetic wave-based detection using standard wireless communication hardware. Instead of requiring dedicated mechanical or optical sensors for material detection, the patent substitutes these with wireless signal transmission and analysis, eliminating the need for expensive specialized components.
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 accurate, portable, and low-cost material identification in various environments, allowing for ubiquitous object material detection without the need for specialized hardware, expanding applications beyond lab settings.
Implementation Method 1
The second wireless signal comprises a reflection or a refraction of the first wireless signal at a target material surface of an object in the venue
Implementation Method 2
The second wireless signal comprises a reflection or a refraction of the first wireless signal at a target material surface of an object in the venue
Data Source
AI summary
Methods, apparatus and systems for wireless material sensing are described. In one example, a described system comprises: a transmitter configured for transmitting, using transmit antennas, a first wireless signal through a wireless multipath channel of a venue; a receiver configured for receiving, using receive antennas, a second wireless signal through the wireless multipath channel; and a processor. The second wireless signal comprises a reflection or a refraction of the first wireless signal at a surface of a target material of an object in the venue. The processor is configured for: obtaining a plurality of channel information (CI) of the wireless multipath channel based on the second wireless signal, wherein each CI is associated with a respective transmit antenna and a respective receive antenna; computing a material analytics based on the plurality of CI; and determining a type of the target material of the object based on the material analytics.