18 August 1997 Homodyne frequency-domain instrument: I & Q Phase Detection System
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The noninvasive NIR detection technique can be used to detect the clinic-related parameter such as hemoglobin concentration and saturation. By now, many techniques have been demonstrated in both time-domain and frequency domain to obtain quantitative optical properties. In this paper, we demonstrate one kind of simple homodyne phase modulation system -- in- phase and quadrature phase (I&O) detection system, introducing its principle and constitution, presenting its performance through the tests of ink, intralipid and blood model.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hong Yan Ma, Hong Yan Ma, Congwu Du, Congwu Du, Britton Chance, Britton Chance, "Homodyne frequency-domain instrument: I & Q Phase Detection System", Proc. SPIE 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II, (18 August 1997); doi: 10.1117/12.280231; https://doi.org/10.1117/12.280231

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