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편광 상이 고리 구조 내 복합 파장판 조합을 이용한 평탄 대역 다파장 스펙트럼의 연속적인 파장 조정에 관한 연구
한진실(Jinsil Han),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.4
In this paper, we propose a flat-top band birefringence filter capable of continuously controlling the wavelength with a combination of waveplates using polarization-diversity loop structure(PDLS). The proposed filter consists of polarization beam splitter(PBS), two polarization-maintaining fibers(PMF) of the same length, two half-wave plates(HWP), and two quarter-wave plates(QWP). Based on the filter transmittance derived through Jones calculus, we found a combination of orientation angles of the four waveplates which could induce an extra phase difference φ from 0° to 360° in the flat-top band transmittance function. Then the calculated transmission spectrum was derived from the eight sets of orientation angles combination of waveplates selected to add φ from 0° to 315° at intervals of 45°. In conclusion, we constructed the multiwavelength filter and verified the theoretical prediction experimentally by implementing a flat-top transmission spectrum.
광 산란 패턴의 발산 각도 분포를 이용한 비표지 박테리아 분별 기법에 관한 연구
한진실(Jinsil Han),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.9
In this paper, we propose a scheme for label-free bacteria discrimination by utilizing the divergence angle of the scattering patterns of bacteria colonies. Three kinds of bacteria, such as Escherichia coli (E. coli), Salmonella typhimurium (S. typhimurium), and Listeria monocytogenes (L. monocytogenes), were compared in view of the divergence angle of their colony scattering patterns by using the proposed scheme. The diameter of the cultured bacteria colonies used for comparison ranged from 0.8 to 2.2 ㎜ for all the three specimens. First, to obtain their scattering patterns, each colony was illuminated by a low power green laser at 532nm. Then, the sizes of the scattering patterns were measured from the acquired colony scattering patterns. The divergence angles of the scattering patterns could be calculated by using the measured colony diameters and scattering pattern sizes. The experiment results show that there exists a unique range of the divergence angle according to the specimen. By analyzing and comparing the acquisition frequency of the divergence angle, this divergence angle range of the individual specimen was determined to be 4.23°∼8.12° for E. coli, 7.32°∼11.63° for S. typhimurium, and 10.36°∼16.37° for L. monoc ytogenes. From these evaluated divergence angle ranges, the three specimens can be simply identified through the measurement of the colony diameter and the scattering pattern size. This label-free discrimin ation scheme is expected to be beneficially utilized for simple verification of a conventional bacteria discri mination method.
이중 클래딩 광섬유에 새겨진 위상 천이 투과형 격자를 이용한 비틀림 및 온도 분리 측정 센서
한진실(Jinsil Han),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.2
In this paper, we propose an optical fiber sensor capable of separately measuring twist and temperature by incorporating a phase-shifted transmission grating written on double-clad fiber(DCF) with a CO₂ laser. The sensor head exhibited two separate attenuation dips in the resonance wavelength band, and these dips were selected as indicator dips denoted by LD and RD. The torsion and temperature responses of both dips were investigated in a twist angle range from -300° to 300° and a temperature range from 30 to 100°C. When a twist angle increased from 0° to 300°, LD and RD showed red shifts. In contrast, when a twist angle decreased from 0° to -300°, they showed blue shifts. In terms of the temperature response, LD and RD showed red shifts as the ambient temperature increased. As a result, it is confirmed that the torsion and temperature sensitivities of LD and RD are different and the two dips show linear behavior when the two variables (i.e., twist and temperature) are applied to the sensor head, so that changes in torsion and temperature can be separately estimated using the sensitivity coefficient matrix.
편광 유지 광자 결정 광섬유에 제작한 장주기 광섬유 격자를 이용한 광섬유 비틀림 센서
한진실(Jinsil Han),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.2
In this paper, we demonstrated a fiber-optic torsion sensor capable of discriminating twist direction using a long-period fiber grating(LPFG) inscribed on polarization-maintaining photonic cystal fiber(PMPCF) by CO₂ laser pulses. The LPFG written on PMPCF, referred to as the PMPC-LPFG, has a polarization-dependent resonance dip, and two resonance dips are obtained for orthogonal input polarization states designated here as linear horizontal polarization(LHP) and linear vertical polarization(LVP). The torsion responses of these two resonance dips were investigated in a twist angle range from -160° to 160°. When the transmittance of the fabricated PMPC-LPFG, measured on a logarithmic scale, was converted to the transmittance represented on a linear scale, the torsion responses of both dips showed high linearity with an adjusted R<SUP>2</SUP> value greater than 0.99596 in a twist angle range from -160° to 160°. In addition, the temperature response was also examined in a temperature range from 40 to 80℃. The experimental results show that our PMPC-LPFG-based torsion sensor can distinguish torsion direction with excellent linearity and can also offer temperature-insensitive torsion measurement.