28 February 2014 Wide-field spectroscopic imaging of biological-substance distributions on entire faces by measuring middle infrared lights emitted from human bodies itself
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Abstract
We are aiming at the realization of the measurement technology for the biological-substance distributions, such as sebum, on entire faces at the daily-life environment. We proposed the imaging-type 2-dimensional Fourier spectroscopy [1] that is the palmtop-size portable measurement apparatus and has the strong robustness for mechanical vibrations. And the proposed method can measure the wide-field 2-dimensional middle-infrared spectroscopic-imaging of radiation lights emitted from human bodies itself without light sources. In the proposed method, we install the phase-shifter, that can give an arbitrary phase difference for the half-flux of objective beams, at the optical Fourier transform plane of the infinity corrected optical system. The near-common-path interferometer that is a phase-shift interferometer between objective beams can be realized. In this proposed method, the emitted rays from each single-bright-point on measurement surfaces can interfere with each other. Thus, even if the middle infrared-lights from human bodies are the spatially incoherent light, we can acquire the interferograms at each pixel on an imaging array-device in accordance with the amount of phase shift as the 2-dimensional image-intensity changes. We demonstrated the feasibility of the middle infrared spectroscopic imaging of whole human faces without active illuminations.
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Yo Suzuki, Yo Suzuki, Wei Qi, Wei Qi, Masaru Fujiwara, Masaru Fujiwara, Hiroyuki Hiramatsu, Hiroyuki Hiramatsu, Satoru Suzuki, Satoru Suzuki, Pradeep Abeygunawardhana, Pradeep Abeygunawardhana, Kenji Wada, Kenji Wada, Akira Nishiyama, Akira Nishiyama, Ichiro Ishimaru, Ichiro Ishimaru, } "Wide-field spectroscopic imaging of biological-substance distributions on entire faces by measuring middle infrared lights emitted from human bodies itself", Proc. SPIE 8951, Optical Diagnostics and Sensing XIV: Toward Point-of-Care Diagnostics, 89510Z (28 February 2014); doi: 10.1117/12.2038837; https://doi.org/10.1117/12.2038837
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