Proposal of ultra-compact and vibration-resistant three-dimensional displacement distribution measurement method by single-injection multi-direction imaging

2019 Fiscal Year Final Research Report

• Project/Area Number: 19K21078
• Project/Area Number (Other): 18H05904 (2018)
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund (2019); Single-year Grants (2018)
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: National Institute of Information and Communications Technology (2019); University of Fukui (2018)
• Principal Investigator: Goto Yuta 国立研究開発法人情報通信研究機構, ネットワークシステム研究所フォトニックネットワークシステム研究室, 研究員 (90827057)
• Project Period (FY): 2018-08-24 – 2020-03-31
• Keywords: デジタルホログラフィ / 三次元変位計測 / 内部欠陥検出 / カメラキャリブレーション

Outline of Final Research Achievements

First, it was confirmed that reconstructed images in different viewpoints was obtained by spatially dividing the hologram when measuring the dice. Next, the aluminum plate consisting of the movable part and the fixed part was measured. From the results, it was confirmed that the phase was changed by the displacement of the object. Finally, the phase difference was acquired by slightly displacing the movable part of the aluminum plate in the x, y, and z directions. From the results, it confirmed that sensitivity vectors from multiple directions can be obtained by a single camera. These results was presented at International Workshop on Holography and Related Technologies 2019 (IWH2019).

Free Research Field

情報光学

Academic Significance and Societal Importance of the Research Achievements

近年，高度成長期に相次いで整備された構造物は寿命を迎えようとしている．それらの保守・点検を簡易かつ高精度に行う技術の確立は喫緊の課題である．有望な技術として，デジタルホログラフィを用いた3次元変位計測手法がある．本手法において3次元の変位を求めるためには，原理的に最低3つの独立した光源またはカメラが必要となり，光学系の複雑化・大型化が問題となる．本研究では１つ光源と1つのカメラのみを用いる 3次元変位計測手法を提案する．本研究が完成した時，従来では困難であった3次元変位計測技装置の大幅な小型化が実現できるため学術的・社会的意義が大きい．