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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
Published on: February 8, 2014
Experimental research on terahertz Gabor inline digital holography of concealed objects
1National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, China. hit_liqi@yahoo.cn
Applied Optics
|October 12, 2012
Summary
Terahertz (THz) digital holography can image concealed objects through barriers like paper and plastic. This technology demonstrates feasibility for non-destructive imaging applications.
Area of Science:
- Optics and Photonics
- Non-destructive Testing
- Terahertz Imaging Technology
Background:
- Terahertz (THz) radiation penetrates nonmetallic and nonpolar materials opaque to visible light.
- THz digital holography offers potential for imaging concealed objects through barriers.
Purpose of the Study:
- To investigate the feasibility of THz Gabor inline digital holography for imaging concealed objects through various barriers.
- To assess the quality of reconstructed images obtained using THz digital holography with barriers.
Main Methods:
- Utilized a CO(2) pumped continuous THz Gabor inline digital holographic imaging system.
- Conducted experiments using paper, Teflon, plastic express envelopes, and silicon wafers as barriers.
- Obtained and compared reconstructed holographic images with and without barriers.
Main Results:
- High-quality reconstructed images of concealed objects were successfully obtained through multiple barrier materials.
- The presence of barriers did not prevent the successful reconstruction of images.
- Image quality was comparable to reconstructions without any barriers.
Conclusions:
- THz Gabor inline digital holography is a feasible technique for imaging concealed objects.
- The system effectively penetrates common nonmetallic and nonpolar barrier materials.
- This technology holds promise for non-destructive inspection and concealed object detection.
