Continuous-wave terahertz interferometry with multiwavelength phase unwrapping.
Summary of "Continuous-wave terahertz interferometry with multiwavelength phase unwrapping."
Continuous-wave (cw) terahertz (THz) phase imaging can accurately and noninvasively present the depth information of an object's surface and interior. However, a 2π ambiguity limits the measurement of a sample with a thickness larger than the detection wavelength of THz waves. A multiwavelength phase unwrapping method is introduced to the cw THz phase imaging to reconstruct the exact phase map of the object. By using this method, three different types of high-density polyethylene samples were measured, and their phase profiles were well extracted. The result shows that this method is effective in cw THz phase imaging and has the potential to improve the applications of cw THz imaging.
Affiliation
Department of Physics, Harbin Institute of Technology, No. 92 XiDaZhiJie, Harbin 150001, China.
Journal Details
This article was published in the following journal.
Name: Applied optics
ISSN: 1539-4522
Pages: 5095-102
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20856283
- DOI: http://dx.doi.org/
Medical and Biotech [MESH] Definitions
Interferometry
Measurement of distances or movements by means of the phenomena caused by the interference of two rays of light (optical interferometry) or of sound (acoustic interferometry).
Terahertz Imaging
The visualization of internal structure using TERAHERTZ RADIATION technologies.
Terahertz Spectroscopy
Spectrum analysis of absorbed or emitted TERAHERTZ RADIATION.
Gels
Colloids with a solid continuous phase and liquid as the dispersed phase; gels may be unstable when, due to temperature or other cause, the solid phase liquefies; the resulting colloid is called a sol.
Colloids
Two-phase systems in which one is uniformly dispersed in another as particles small enough so they cannot be filtered or will not settle out. The dispersing or continuous phase or medium envelops the particles of the discontinuous phase. All three states of matter can form colloids among each other.
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