Establishment of Target Detection Methodology in Highly Scattering Media

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14167
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21030:Measurement engineering-related
• Research Institution: Chiba University
• Principal Investigator: Xiafukaiti Alifu 千葉大学, 大学院工学研究院, 特任研究員 (30899092)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 環状光 / 非回折光 / 散乱媒質 / 物体検出

Outline of Final Research Achievements

This study aims to utilize the self-reconstruction properties of non-diffracting beam generated from annular beam propagation in highly scattering media to achieve target detection within such media. Our previous work have shown that non-diffracting beam generated from annular beam interference exhibits a significant characteristic of suppressing diffraction and medium fluctuations compared to Gaussian beam propagation. We successfully generated non-diffracting beam even in scattering media with optical densities similar to biological tissues, elucidating the generation characteristics of non-diffracting beam. It was possible to estimate the conditions for generating non-diffracting beam in arbitrary environments. In this study, we aim to realize the self-reconstruction properties of non-diffracting beam within scattering media in concentration ranges similar to biological tissues and achieve target detection within the medium through theoretical approaches and experimental validation.

Free Research Field

光計測

Academic Significance and Societal Importance of the Research Achievements

環境計測、医療計測や軍事産業などの光センシング分野において、測定対象の情報を非侵襲かつ非接触で高効率・高分解能に計測する技術が期待されている。しかしながら、エックス線と異なる可視光や近赤外線は、散乱媒質中の伝搬において複数回強く散乱されるため偏光とコヒーレンスが崩れる。また、入射光は伝搬に伴い回折や干渉の影響で元のエネルギーが分散され、伝搬可能な距離が制限されてしまい、長深度伝搬することが困難になる。散乱媒質中における高効率の伝搬手法が確立できれば光センシング範囲の拡大、精度の向上が実現できる。