Visualization of internal structure and internal stress in visibly opaque objects using full-field phase-shifting terahertz digital holography

• Yamagiwa, Masatomo

• Minamikawa, Takeo

• Minamiji, Fui

• Mizuno, Takahiko

• Tokizane, Yu

• Oe, Ryo

• Koresawa, hidenori

• Mizutani, Yasuhiro

• Iwata, Tetsuo

• Yamamoto, Hirotsugu

• Yasui, Takeshi

抄録

We construct a full-field phase-shifting terahertz digital holography (PS-THz-DH) system by use of a THz quantum cascade laser and an uncooled, 2D micro-bolometer array. The PS-THz-DH enables us to separate the necessary diffraction-order image from unnecessary diffraction-order images without the need for spatial Fourier filtering, leading to suppress the decrease of spatial resolution. 3D shape of a visibly opaque object is visualized with a sub-millimeter lateral resolution and a sub-μm axial resolution. Also, the digital focusing of amplitude image enables the visualization of internal structure with the millimeter-order axial selectivity. Furthermore, the internal stress distribution of an externally compressed object is visualized from the phase image. The demonstrated results imply a possibility for non-destructive inspection of visibly opaque non-metal materials.

収録刊行物

• Optics Express

  Optics Express 27 (23), 33854-33868, 2019-11-05

  OSA publishing

詳細情報

• CRID: 1050846637595625600
• NII論文ID: 120006783216
• ISSN: 10944087
• Web Site: http://repo.lib.tokushima-u.ac.jp/114124
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
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  • CiNii Articles