| 研究実績の概要 |
In this year, the technology of estimating the complex permittivity by using the millimeter wave radar was developed. The measurement system was build with the stage, radar module, and the indicator. The position of radar and the material can be adjusted precisely with the stage and indicator. During the measurement, the metal plate was utilized for calibration and then the measurements were conducted several times by changing the distance. Acrylic plate was used to test the performance. The measured complex permittivity showed good agreement with the results in other works. With the developed technology of estimating the dielectric property of materials, the dielectric property distribution can be imaged by moving the object in difference directions. Meanwhile, the penetration loss of the millimeter wave inside the materials was evaluated by using the radar and the corner reflector. It was observed that the millimeter wave attenuates quite fast inside the material. It is expected that when using the millimeter wave as the pump wave to illuminate the material, the energy loss will be higher than that in the microwave range. Therefore, the conductivity of the micro-scale structure in the millimeter wave range is also expected to be estimated. Besides, the technology by using the microwave to noninvasively estimate the hydration status monitoring was proposed.
These achievements have been published as journal/conference papers.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The purpose of this research project is to develop a measurement system which can estimate the conductivity of tissue at micro-level resolution. This project is a combination of optical approach and microwave approach. In this year, the microwave part was concentrated on. The microwave and millimeter wave were studied and the technology was proposed which can estimate the permittivity of material with millimeter wave radar. Also, the loss in materials was evaluated which can provide the foundation to figure out the relationship between energy loss and conductivity. With the better understanding of the behavior of the microwave and millimeter wave in permittivity estimation and attenuation loss, it can facilitate the development of the system which is aimed for. The achievements of the research have been published on conference/journal papers, which shows that the research was progressing smoothly.
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