Imaging Probes With PIN Diode Modulation For Polarization Scanning
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Solution Overview
Problem
Microwave tomography faces challenges in achieving robust and quantitative imaging due to the non-linear and ill-posed nature of the inverse scattering problem, requiring substantial data collection and often resulting in incomplete polarization scanning and reduced image resolution.
Innovation Solution
The use of multiple antenna assemblies with probes that can be configured in active and inactive states, allowing for simultaneous illumination with multiple polarizations and data collection without mechanical rotation, utilizing PIN diodes for efficient modulation and minimizing cross-polarization sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If co-resident antennas are used for direct measurement, then data collection is simplified, but measurement precision is reduced due to incomplete polarization scanning
Solution Approach 1:
The patent divides the measurement system into multiple antenna assemblies, each equipped with multiple probes oriented at different angles (e.g., 0°, 45°, 90°, 135°). This segmentation allows each probe to measure a specific polarization component, and the combination of all probes provides complete polarization scanning capability, resolving the contradiction between operational simplicity and measurement precision.
2Measurement precision
If mechanical rotation is used for polarization scanning, then measurement precision improves, but productivity decreases due to time-consuming mechanical movement
Solution Approach 1:
The patent replaces the mechanical rotation system with an electronic switching system. Instead of physically rotating antennas or probes to achieve different polarization orientations, the system uses multiple fixed probes with different orientations and electronically switches between them. This substitution eliminates mechanical movement while maintaining complete polarization scanning capability, thereby improving productivity without sacrificing measurement precision.
3Measurement precision
If more data acquisition points are used, then image quality improves, but device complexity increases
Solution Approach 1:
The patent designs antenna assemblies that serve multiple functions: each assembly contains both transmitting and receiving capabilities, and multiple probes within each assembly can measure different polarization components. This multi-functionality allows the system to collect comprehensive scattering data from multiple points simultaneously without proportionally increasing device complexity, as the same physical structures perform multiple measurement roles.
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 enables the collection of comprehensive scattering data for quantitative imaging, improving resolution and efficiency by allowing simultaneous data acquisition across various polarizations without mechanical movement, thereby overcoming limitations in existing direct and indirect data collection methods.
Implementation Method 1
Each probe of the one or more probes may include a plurality of PIN diodes spaced along an axis of the probe
Implementation Method 2
an object of interest (OI) is illuminated by microwave energy and the scattered fields are collected outside the OI
Data Source
AI summary
Methods and systems may image an object of interest using one or more probes. More specifically, such exemplary methods and systems may deliver electromagnetic energy (e.g., microwave energy) using a transmitting antenna to the object while activating a probe to interact with the scattered field and sampling the resulting scattered field using one or more receiving antennas. The sampled electromagnetic energy may then be used to reconstruct an image of the object.