研究目的
Investigating the application of Infrared Thermography (IRT) to obtain temperature dynamics and reconstruct Specific Absorption Rate (SAR) to evaluate the exposure amenability of Wearable Wireless Devices (WWDs).
研究成果
The study demonstrates the use of IRT for safety evaluation of RF/microwave emissions from wearable devices, showing good agreement between SAR values obtained from IRT and simulation tools. The maximum SAR values were compliant with international safety limits, and the maximum temperature elevation was always less than 1?C. The difference between SAR values obtained through IRT and simulation tools averaged 8.7%.
研究不足
The method's sensitivity is based on IR temperature measurements, and improvement in the accuracy and sensitivity of IR thermometry tools is needed for smaller SAR values computation. Evaluation of SAR using IRT for high-frequency microwave devices would require longer heating periods due to smaller penetration depth.
1:Experimental Design and Method Selection:
The study uses numerical modeling to analyze SAR induced in a phantom using RF/microwave exposure with recommended power levels for various frequencies. IRT is used to investigate thermal changes during exposure intervals. SAR is reconstructed using thermal dynamic measurements and one-dimensional Bio-heat transfer equations.
2:Sample Selection and Data Sources:
Measurements were made with healthy subjects, focusing on the forearm's skin temperature before and after antenna excitation.
3:List of Experimental Equipment and Materials:
A microstrip monopole antenna on a wearable substrate, FLIR A305SC series IR camera, FLIR R&D research IR software tool, Agilent’s N5182A MXG vector signal generator.
4:Experimental Procedures and Operational Workflow:
Thermograms were taken on the forearm for marked areas of interest, revealing skin temperature changes before and after antenna excitation at
5:8, 4, and 5 GHz at 0 mW power level. Data Analysis Methods:
SAR was reconstructed from temperature data using bio-heat equations, and a comparative analysis between simulated and reconstructed SAR values was conducted.
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