2011 Fiscal Year Final Research Report
Next generation signal processing for embedded sensor system
| Project/Area Number |
21300064
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Perception information processing/Intelligent robotics
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| Research Institution | University of Toyama |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Keywords | 情報センシング |
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| Research Abstract |
A new processing technique called non-harmonic analysis （NHA) is proposed for optical coherence tomography （OCT) imaging. Conventional Fourier-domain OCT employs the discrete Fourier transform （DFT), which depends on the window function and length. The axial resolution of the OCT image, calculated by using DFT, is inversely proportional to the full width at half maximum （FWHM) of the wavelength range. The FWHM of wavelength range is limited by the sweeping range of the source in swept-source OCT and it is limited by the number of CCD pixels in spectral domain OCT. However, the NHA process does not have such constraints; NHA can resolve high frequencies irrespective of the window function and the frame length of the sampled data. To demonstrate the benefits of using NHA for OCT, we perform OCT imaging with NHA of an onion skin. The results reveal that NHA can achieve an image resolution equivalent that of a 100-nm sweep range using a significantly reduced wavelength range. They also reveal the potential of using this technique to achieve high-resolution imaging without using a broadband source.
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