4 November 2010 Continuous wave terahertz phase imaging
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Continues wave terahertz imaging has been used widely in the field of security inspection and nondestructive examination because of its simplicity and stability. In this presentation, we proposed an image method with continues wave terahertz interferometry to obtain the sample's phase information. In the experiment, a reference terahertz beam was added into the exiting continues wave terahertz imaging system to be a Michelson interferometer. With three maps obtained at three fixed phase-shift positions, a phase image is obtained by using a phase shift algorithm. Afterwards, this phase image is unwrapped to get its accurate phase profile. By this method, a bulk of foam with two height steps structure is imaged. The result shows that the inner structures of samples can be identified clearly and the relative optical depth profiles of samples can be obtained.
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Wenfeng Sun, Wenfeng Sun, Xinke Wang, Xinke Wang, Ye Cui, Ye Cui, Yan Zhang, Yan Zhang, } "Continuous wave terahertz phase imaging", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78543A (4 November 2010); doi: 10.1117/12.870159; https://doi.org/10.1117/12.870159

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