MEASUREMENT DEVICE AND MEASUREMENT METHOD
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United States of America Patent
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Issued Date -
Nov 13, 2014
app pub date -
Oct 24, 2012
filing date -
Nov 24, 2011
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Abstract
Light emitted from a low-coherence light source is split into two beams by an optical coupler. One of the beams is applied to a sample medium. The other beam is subjected to phase modulation by a reference minor and a vibration element. The (reference) beam subjected to phase modulation and a scattered beam from the sample medium are wavelength-resolved by a diffraction grating, and the spectrum of resulting interference light is detected by a photodetector. A calculation section calculates an intensity signal corresponding to the position of each scattering point in the sample medium based on the detected spectrum, calculates a power spectrum corresponding to the position of each scattering point based on a temporal change in the intensity signal corresponding to the position of each scattering point, and calculates a diffusion coefficient of the particles corresponding to the position of each scattering point based on the calculated power spectrum.
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