SAR Control Device Using Waveguide Sensor and Calibration
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Solution Overview
Problem
Current standards for measuring the specific absorption rate (SAR) of portable telephones are complex and impractical for mass production testing, requiring numerous measurements across various positions and frequencies, making it impossible to test all devices on the market effectively.
Innovation Solution
A device comprising sensors and a processing unit that measure radiated power using a waveguide with an opening and measurement probes, immersed in a phantom with dielectric properties similar to biological tissues, allowing for rapid SAR control by analyzing the power dissipation and position of portable telephones, including features like orthogonal probes, deviometry, and a base station simulator for efficient testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If comprehensive SAR measurements are performed according to standards (multiple positions, frequencies, and sampling points), then measurement precision and reliability are improved, but testing time and device complexity increase significantly
Solution Approach 1:
The measurement process is segmented into two distinct phases: (1) a comprehensive calibration phase performed once on reference objects to establish the relationship between probe signals and SAR values, and (2) a rapid measurement phase for production testing. This segmentation allows the full-precision measurement to be performed only when necessary, while routine testing uses the simplified rapid method.
Solution Approach 2:
The calibration procedure is performed in advance to pre-determine the relationship between probe measurements and SAR values. By establishing this relationship beforehand through comprehensive measurements, the actual production testing can proceed rapidly without repeating the full measurement sequence, thus resolving the time-precision contradiction.
2Measurement precision
If comprehensive SAR measurements are performed according to standards (multiple positions, frequencies, and sampling points), then measurement precision and reliability are improved, but device complexity increases
Solution Approach 1:
The measurement system is segmented into two operational modes: a calibration mode that uses the full comprehensive measurement protocol with multiple positions and frequencies, and a rapid measurement mode that uses a simplified single-position protocol. This allows the complex high-precision measurements to be confined to the calibration phase only.
Solution Approach 2:
Instead of performing comprehensive measurements on every device, the system creates a calibrated reference model from comprehensive measurements of reference objects. This reference model (copy of the measurement relationship) is then used to rapidly assess production devices without repeating the complex measurement sequence, thereby reducing device complexity while maintaining precision.
3Productivity
If rapid SAR control is implemented for mass production, then productivity is improved, but measurement precision may deteriorate
Solution Approach 1:
The system uses feedback from comprehensive calibration measurements to adjust and validate the rapid measurement protocol. The calibration phase establishes reference data that feeds into the rapid measurement algorithm, ensuring that even the simplified rapid measurements maintain accuracy by being anchored to the comprehensive reference measurements.
Solution Approach 2:
The rapid measurement system uses a copied relationship (calibration curve or lookup table) derived from comprehensive measurements. This copied measurement model allows rapid assessment while preserving the precision characteristics of the full measurement protocol, as the rapid measurements are interpreted through the lens of the comprehensive calibration data.
4Reliability
If comprehensive SAR measurements are performed according to standards (multiple positions, frequencies, and sampling points), then reliability of SAR control is improved, but ease of operation deteriorates
Solution Approach 1:
The operational procedure is segmented into an automated calibration phase (performed once) and a simplified rapid measurement phase (performed repeatedly). The segmentation transfers the operational complexity to the initial calibration phase, which is automated, while leaving the routine production measurements simple and straightforward.
Solution Approach 2:
The system performs self-calibration using reference objects with known SAR characteristics. This self-service calibration approach automates the complex setup and measurement procedures, eliminating the need for manual configuration and making the system easy to operate while maintaining reliability through automated reference-based validation.
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 fast, noninvasive, and cost-effective real-time monitoring of SAR, allowing for rapid sorting and diagnosis of compliant devices, reducing testing time and complexity while integrating easily into manufacturing lines.
Implementation Method 1
the sensor comprising a waveguide exhibiting an opening disposed opposite the test zone and at least one measurement probe disposed inside said waveguide
Implementation Method 2
at least one measurement probe disposed inside said waveguide
Implementation Method 3
the sensor furthermore comprises a phantom in a material having dielectric properties similar to those of biological tissues
Data Source
AI summary
The invention relates to a device for controlling the specific absorption rate of mass-produced radiant objects. The inventive device is characterized in that it comprises: at least one sensor for measuring a power radiated by an object which is located in the zone, and at least one processing unit for analyzing the power thus measured. The aforementioned sensor consist of a waveguide comprising an opening which is disposed opposite the test zone and at least one measuring probe which is disposed inside the waveguide.