Terahertz multi-wavelength imaging for nondestructive detection

Liangliang Zhang; Hua Zhong; Chao Deng; CunLin Zhang

doi:10.1117/12.836175

4 August 2009 Terahertz multi-wavelength imaging for nondestructive detection

Liangliang Zhang, Hua Zhong, Chao Deng, CunLin Zhang

Proceedings Volume 7385, International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications; 73850V (2009) https://doi.org/10.1117/12.836175
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

We present a terahertz two dimensional phase imaging method with multiwavelength. This novel approach can image object with larger optical length compared to using the largest wavelength in the terahertz spectrum and does not involve the usual phase unwrapping in the detection of phase discontinuity. Furthermore, this technique can significantly decreases the background noise and allows one to resolve very fine structures for non-destructive detection. The validity of this new method can be demonstrated by processing the terahertz raster-scan two-dimensional(2D) image data of a polyethylene wedge and a piece of foam with a rectangle groove. The measurements show that the multiwavelength phase imaging is a straightforward and efficient phase data processing method in terahertz imaging application.

Citation Download Citation

Liangliang Zhang, Hua Zhong, Chao Deng, and CunLin Zhang "Terahertz multi-wavelength imaging for nondestructive detection", Proc. SPIE 7385, International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications, 73850V (4 August 2009); https://doi.org/10.1117/12.836175

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