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주파수 영역 분광법을 이용한 다중산란 매질의 광학계수 측정
전계진,윤길원,김건식,전성만,박승한 한국광학회 1999 한국광학회지 Vol.10 No.5
A frequency domain spectroscopic system was constructed to investigate the optical properties of multiple scattering media. The alternating current (AC) and phase lag components of backscattered light were measured by using the heterodyne detection method. Absorption and transport scattering coefficients were computed from the values based on diffusion theory. Predictions showed excellent matches in comparison with actual values of absorption and scattering. Predictable ranges of the optical coefficients were analyzed in terms of the distance between light source and detector, and modulation frequencies. A proposed compact experimental set-up using laser diodes can be utilized to estimate non-invasively the optical properties of multiple scattering media such as biological tissues.
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시간 분해 반사율에 의한 생체조직의 흡수계수와 산란계수 측정
전계진,박승한,김웅,윤길원,Jeon, Kye-Jin,Park, Seung-Han,Kim, Ung,Yoon, Gil-Won 대한의용생체공학회 1997 의공학회지 Vol.18 No.4
A non-invasive technique to measure absorption and scattering coefficients was investigated The reflected backscattered light from the surface of phantom and biological tissue was obtained by using a time-correlated single photon counting system in pico-second time domain. The absorption and scattering coefficients were acquired by the time of peak and asymptotic behavior of the time-resolved reflectance curve and agreed well the ones that is obtained with deconvolution method It was found that the approximation method was good for biological medium to calculate optical properties due to its convenience and accuracy.
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총헤모글로빈 농도를 비침습적으로 측정하기 위한 400 - 2500nm 대역의 흡수 스펙트럼 분석
전계진(Kye Jin Jeon),김연주(Yoen Joo Kim),김수진(Su Jin Kim),김홍식(Hong Sig Kim),윤길원(Gil Won Yoon) 한국센서학회 2001 센서학회지 Vol.10 No.6
Absorption spectra of blood components have been measured for the purpose of predicting the total hemoglobin concentration. We obtained absorption spectra of major blood components from the visible to near-infrared of 400∼2500nm region. In the near-infrared, water is the main absorbing constituent. The amount of water in the sample cell varies depending on the volume of solute concentration(water displacement). We acquired water-compensated spectra by considering the variation of water volume depending on the variation of analyte concentration. Those spectra show inherent absorption peaks of analytes and linearity with respect to concentration. We selected wavelengths for non-invasive measurement of hemoglobin concentration considering the scattering effect of tissue and the interference of other blood components.
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재귀적 수치 계산법을 적용한 모바일 폰용 광각 광학계 설계
이규행,박성민,전계진 한국광학회 2024 한국광학회지 Vol.35 No.4
재귀적 수치 계산법을 적용하여 모바일 폰용 카메라 광학 모듈의 기초 설계를 진행하였다. 38도의 반각 필드에 대한 결상 성능을 높이기 위하여 6개의 비구면 렌즈로 광학계를 구성하였으며, 소형 기기인 모바일 폰에서의 적용성을 높이기 위하여 전체 길이는 5 mm로 제한하였다. 기초 설계에서 얻은 데이터를 바탕으로 Zemax 설계 툴을 사용하여 최적화 설계를 진행하였으며, 최적화된 광학계의 결상 성능은 280 line/mm 패턴에 대한 modulation transfer function (MTF) 값이 19% 이상이고 다파장 광선에 대한 상 왜곡도는 최대 1.0% 이내임을 확인할 수 있었 다. 본 논문을 통하여 재귀적 수치 계산법을 사용한 소형 모바일 폰 카메라의 기초설계가 가능함을 검증할 수 있었다. We applied recursive numerical computation to create a basic design of a camera optical module for mobile phones. To enhance the resolutionperformance for a 38-degree field of view, we constructed the optical system with six non-spherical lenses. However, to increase its applicabilityas a compact mobile phone, we limited the overall length to 5 mm in the design. Using the data obtained from the basic design, we proceeded with optimization design using the Zemax design tool. The optimized optical system achieved a resolution performance with a modulation transfer function value of more than 19% for a 280 line/mm pattern and image distortion within 1.0% for all wavelength rays. In this paper, we verify the feasibility of using recursive numerical computation for the basic design of a compact mobile phone camera.
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실험계획 법에 의한 혈중 글루코즈 측정 시 타 성분의 영향 분석
김연주,윤길원,전계진 대한의용생체공학회 2001 의공학회지 Vol.22 No.6
Influence of other blond components on measuring glucose concentration was analyzed B)food phantom containing five major components was made. The prediction model was developed based on the measurement of absorption spectra including the first overtone glucose band, i.e.. 1500 ∼ 1850 nm. The concentrations were Predicted using the Partial least squares regression. Factor analysis based on Design of Experiment was Performed to study the influence of other components in predicting glucose concentration. Triglyceride does not influence. Albumin and globulin haute minor effects. However, hemoglobin showed substantial response and the compensation of hemoglobin concentration appears to be required for the model of glucose measurement.
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김수진,황돈연,전계진,이종연,정성규,윤길원 한국광학회 2000 한국광학회지 Vol.11 No.6
A measurement unit and signal processing algorithm have been developed for predicting arterial oxygen saturation noninvasively. The measurement set-up was composed of a probe including light source and photodetector, optical signal processing section, LED driving circuit, PC interface software for data acquisition and data processing software. Light from the LED's was irradiated onto the finger nail bed and transmitted light was measured at different wavelengths. An effective baseline correction method was developed and measured data were analyzed by using various data processing methods and prediction algOlithms. For performance evaluation, a pulse oximeter simulator (Bio- Tek Instrument Inc.) was used as reference. The best performance in terms of the correlation coefficient and the standard deviation was obtained under the following conditions; when the arterial signals were computed in terms of area rather than peak-valley difference, and when the algorithm calculating by $In(I_p/I_v)/I_{avr}$ value for pulsation waveform was used. In in vivo test, prediction was improved when the developed baseline correction method was used. In addition, wavelengths of 660 nm and 940 nm provided better linearity and precision than wavelengths of 660 nm and 805 nm. 05 nm.
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