• 제목/요약/키워드: optics

검색결과 5,436건 처리시간 0.031초

12-year LIDAR Observations of Tropospheric Aerosol over Hefei (31.9°N, 117.2°E), China

  • Wu, Decheng;Zhou, Jun;Liu, Dong;Wang, Zhenzhu;Zhong, Zhiqing;Xie, Chenbo;Qi, Fudi;Fan, Aiyuan;Wang, Yingjian
    • Journal of the Optical Society of Korea
    • /
    • 제15권1호
    • /
    • pp.90-95
    • /
    • 2011
  • 12-year LIDAR observations of tropospheric aerosol vertical distribution using a Mie scattering LIDAR in Hefei ($31.9^{\circ}N$, $117.2^{\circ}E$) from 1998 to 2009 are presented and analyzed in this paper. Characters of temporal variation and vertical distribution of tropospheric aerosol over Hefei are summarized from the LIDAR measurements. The impacts of natural source and human activities on the aerosol vertical distribution over Hefei could be seen clearly. Dust particles from the north in spring could affect the aerosol distributions below about 12 km over Hefei, and aerosol scale height in April reaches $2.29{\pm}0.68\;km$. Both LIDAR measurements and surface visibility imply that aerosols in the lower troposphere have been increasing since about 2005.

Design and Development of a Single-photon Laser and Infrared Common Aperture Optical System

  • Wu, Hongbo;Zhang, Xin;Tan, Shuanglong;Liu, Mingxin;Wang, Lingjie;Yan, Lei;Liu, Yang;Shi, Guangwei
    • Current Optics and Photonics
    • /
    • 제6권2호
    • /
    • pp.171-182
    • /
    • 2022
  • A single-photon laser and mid-wave infrared (MWIR) common aperture optical system was designed and developed to detect and range a long-distance civil aviation aircraft. The secondary mirror of the Ritchey-Chretien (R-C) optical system was chosen as a dichroic lens to realize the design of a common aperture system for the laser and MWIR. Point spread function (PSF) ellipticity was introduced to evaluate the coupling efficiency of the laser receiving system. A small aperture stop and narrow filter were set in the secondary image plane and an afocal light path of the laser system, respectively, and the stray light suppression ability of the small aperture stop was verified by modeling and simulation. With high-precision manufacturing technology by single point diamond turning (SPDT) and a high-efficiency dichroic coating, the laser/MWIR common aperture optical system with a 𝜑300 mm aluminum alloy mirror obtained images of buildings at a distance of 5 km with great quality. A civil aviation aircraft detection experiment was conducted. The results show that the common aperture system could detect and track long-distance civil aviation aircraft effectively, and the coverage was more than 450 km (signal-to-noise ratio = 6.3). It satisfied the application requirements for earlier warning and ranging of long-range targets in the area of aviation, aerospace and ground detection systems.

Rapid Detection of Trace 1,4-Dichlorobenzene Using Laser Mass Spectrometry

  • Ding, Lei;Ma, Jing;Zheng, Haiyang;Fang, Li;Zhang, Weijun;Kim, Duk-Hyeon;Cha, Hyung-Ki
    • Bulletin of the Korean Chemical Society
    • /
    • 제27권9호
    • /
    • pp.1393-1396
    • /
    • 2006
  • The 1+1 two-photon Resonant Enhanced Multiphoton Ionization (REMPI) spectra of 1,4-dichlorobenzene was obtained from 240 nm through to 250 nm on a laser mass spectrometer. Special care was taken to build up a heatable sample inlet system suitable for detecting a trace semi-volatile organic compound and reducing the memory effort on the inner wall of the inlet system. The detection limits of 1,4-dichlorobenzene in ppbV/V concentration range at certain wavelengths are presented.

2.2X 갈릴레이식 망원안경의 설계 (The Design of 2.2X Galilean Telescopic Spectacles)

  • 차정원;이동희;최경서
    • 한국안광학회지
    • /
    • 제10권3호
    • /
    • pp.247-253
    • /
    • 2005
  • 본 논문에서 우리는 저시력용 갈릴레이식 망원안경을 설계하였는데 독일 제품을 참조하였다. 설계에 사용한 배율은 일반적인 용도를 위한 2.2X로 하였고, 구경 스탑(aperture stop) 의 크기는 3mm로 하였다. 본 갈릴레이식 망원안경은 Kidger Optics사의 Sigma2100 S/W로 설계하였다. 설계 결과 우리는 MTF 0.25 기준에서 0.25 cycles/arc-minute의 선폭을, 왜곡수차 1% 이내의 수차를 가지는 시스템을 구성할 수가 있었다. 본 시스템은 저시력용으로 유용할 것으로 판단된다.

  • PDF

수소화된 비정질 탄소 박막의 전기적 특성 (Electrical Characteristics Mechanism In a-C : H)

  • 정진우;강성수;육도진;이원진;신재현
    • 한국안광학회지
    • /
    • 제2권1호
    • /
    • pp.103-110
    • /
    • 1997
  • PECVD 방법으로 제작한 비정질 탄소 박막의 전기적 특성을 조사하였다. 기존에 제시되어 있는 전기전도의 두 가지 모형을 측정결과와 비교하였다. 실험결과 상온에서 제작된 시료는 VRH 모델, 고온에서 제작된 시료는 MPH 모델로서 설명이 가능하였다. 이러한 결과로부터 새로운 전기전도에 대한 모델이 확립되어야 할 것으로 생각한다.

  • PDF

천체관측용 적외선 광학계 초정밀 가공 (ULTRA PRECISION MACHINING FOR ASTRONOMICAL INFRARED OPTICS)

  • 김건희;진호;양순철;김명상;국명호;이성호;육인수
    • 천문학논총
    • /
    • 제22권3호
    • /
    • pp.55-61
    • /
    • 2007
  • The KASINICS (Korea Astronomy and Space science Institute Near Infrared Camera System) is a ground-based near-infrared (NIR) imaging instrument. KASINICS has offner relay optics to reduce unwanted infrared light. For the offner optics, we adopted an ultra precision machining process which is installed at KBSI (Korea Basics Science research Institute). Since the offner relay optics is made of aluminum 6061 metal material, we did several tests to reach the specification. We found that a 0.497mm radius nose bite and 220m/min machining speed are best tool and condition to make this offner optics with the precision machine. In this paper, we report the technical method of ultra precision machining and results of the KASINICS offner optics.

안경사 국가시험 문항개발 기준(2000년판)작성 연구(II) (A Study on the Standard of the Optician National Licensing Examination by Job Analysis(II))

  • 이원진;원찬희;마기중;강성수;육도진;박혜정
    • 한국안광학회지
    • /
    • 제6권1호
    • /
    • pp.1-11
    • /
    • 2001
  • DACUM방법에 의하여 안경사의 직무를 분석하여 직무기술서를 작성하고 전국의 안경사 300명에게 설문조사에 의하여 검증을 거친 뒤 직무요건서를 작성하였다. 직무요건서 작성에는 설문조사에 의한 일의 중요도와 빈도가 3점 만점에 2.15점 이상인 일의 요소를 선택하였으며, 이를 기준으로 안경사 국가시험 문항개발기준을 도출하였다.

  • PDF

Adaptive Optics in Institute of Optics and Electronics, China

  • Jiang, Wenhan;Ling, Ning
    • 한국광학회:학술대회논문집
    • /
    • 한국광학회 2000년도 하계학술발표회
    • /
    • pp.3-3
    • /
    • 2000
  • Adaptive Optical (AO) technology can compensate for wave-front errors in real-time to improve image and beam quality. The research and development on AO in China began in 1979. In 1980, the first laboratory on AO in China was established in Institute of Optics and Electronics (IOE), Chinese Academy of Sciences (CAS). Since then several AO systems have been built in this Laboratory. The 19-element system is the first AO system in the world ever used in inertial confinement fusion (ICF) facility in our knowledge. It corrects the static error of this large laser engineering. The 21-element system was firstly tested at the 1.2m telescope of Kunming Observatory in 1990 and then up-dated as an IR AO system installed at the 2.16m telescope of Beijing Observatory. The 37-element system was used with a turbulence cell in Laboratory on Atmospheric Optics in Hefei to conduct elementary research on Atmospheric Optics. The 61-element system for astronomical observation is newly developed. It has been successfully installed at the 1.2m telescope of Kunming Observatory and a laser guide star system will be integrated with the system. A compact AO system using our newly developed miniature DM for high resolution ophthalmic imaging of retina is also being built. The key elements of these AO systems, deformable mirrors and fast-steering mirrors, are all developed in this Laboratory. In this talk, the main configurations of these AO systems, some test results as well as the specifications of these active mirrors will be presented.

  • PDF

반구형 SIL을 이용한 미디어 내부 이층 근접장 광 기록계의 설계 (Design of Cover Layer Incident Dual-Layer Near-Field Recording Optics with Hemispherical SIL)

  • 김완진;최현;송태선;박노철;박영필
    • 정보저장시스템학회:학술대회논문집
    • /
    • 정보저장시스템학회 2005년도 추계학술대회 논문집
    • /
    • pp.4-11
    • /
    • 2005
  • In this paper, we propose novel optics design for media inside near-field recording (NFR) using hemispherical solid immersion lens (HMS). To obtain strong advantage of data protection and high data capacity simultaneously, HMS based near field optics using aplanatic position of super hemisphere is designed. In this design, to improve small optical tolerance of this aplanatic position, additional aspheric lens surface is added on top of the HMS and it is combined with zoom optics which composed of two single lenses having low numerical aperture (NA). Also, to compensate chromatic aberration which happens seriously in optics using blue laser diode, diffractive optical element is used. Using zoom optics, additional aspheric lens surface, and diffractive optical element together, wavefront aberration and chromatic aberration are effectively reduced in broad range of cover layer thickness and wavelength variation. In addition, In this paper, effect of gap induced aberration is investigated by analyzing different behavior of each TM and TE wave for designed media inside dual-layer NFR optics.

  • PDF

고경사 자유곡면 측정을 위한 파장변조 층밀리기 간섭계 (Wavelength Scanning Lateral Shearing Interferometer for Freeform Surface Measurement)

  • 이혁교;김영식;이주형;양호순;이윤우
    • 한국정밀공학회지
    • /
    • 제31권3호
    • /
    • pp.199-205
    • /
    • 2014
  • We propose a new variant of lateral shearing interferometer with a tunable laser source that enables 3D surface profile measurements of freeform optics with high speed, high vertical resolution, large departure, and large field-of-view. We have verified the proposed technique by comparing our measurement result with that of an existing technique and measuring a representative sample of freeform optics. Moreover, we propose a new algorithm that is able to compensate the rotational inaccuracy.