• 제목/요약/키워드: Electronic Laser Interferometry

검색결과 51건 처리시간 0.033초

레이저 스페클 간섭법을 이용한 면내변위 측정시스템 개발 (The Development of In-Plane Displacement Measurement System on Laser Speckle Interferometry)

  • 윤홍석;김경석;박찬주;최태호;최정석
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2005년도 춘계학술대회 논문집
    • /
    • pp.556-560
    • /
    • 2005
  • The measurement method by Laser Speckle Interferometry which uses the interference law which will grow precedes and with it explains a resolution measurement ability and together the change of place arrowhead and general measurement, at real-time measurement sensitivity it has application boat song from candle precise measurement field it is increasing. But, currently the domestic application technique to sleeps and optical science military merit by optical science interferometer and directness it composes purchases to the level which it applies the expensive commercial business equipment the outside and in spite of the technical ripple effect is deficient even in many strong point. The hazard which complements like this problem point form technical development it leads from the research which it sees and an application degree and to sleep as the measurement equipment which tries to develop the small-sized optical science interference sensor and an interpretation program it raises it does.

  • PDF

레이저 다이오드를 이용한 정현파 위상변조 간섭에 의한 실시간 극미세 진동 측정에 관한 연구 (A study on real time measuring microscopic movements in sinusoidal phase modulating interferometry using a laser diode)

  • 구자남;염정덕;지철근
    • 한국조명전기설비학회:학술대회논문집
    • /
    • 한국조명전기설비학회 1990년도 추계학술발표회논문집
    • /
    • pp.23-27
    • /
    • 1990
  • A new signal processing system for real time displacement measurement in sinusoidal phase modulating interferometry is described. Although sinusoidal phase modulating interferometry is effective in measuring with high accuracy the displacement of an object, conventional signal processing takes a long time. In this method, detection of the object's displacement is easily achieved by sampling the interference signal at those times that satisfy certain conditions and by processing the sampled signals with electric circuits in real time. The delay time of this signal processing system is < 45${\mu}$s. Specially in this paper we describe all electronic circuit and optical system design

  • PDF

레이저 다이오드를 이용한 정현파 위상변조 간섭에 의한 실시간 극미세 진동 측정에 관한 연구 (A study on real time measuring microscopic movements in sinusoidal phase modulating interferometry using a laser diode)

  • 강성철;진상규;지철근
    • 한국조명전기설비학회:학술대회논문집
    • /
    • 한국조명전기설비학회 1991년도 추계학술발표회논문집
    • /
    • pp.33-37
    • /
    • 1991
  • A now signal precessing system for real time displacement measurement in sinusoidal phase modulating interferometry is described. Although sinusoidal phase modulating interferometry is effective in measuring with high accuracy the displacement of an object, conventional signal processing takes along time. In this method, detection of the object's displacement is easily achieved by sampling the interference signal at those times that satisfy certain conditions and by processing the sampled signals with electric circuits in real time. the delay time of this signal processing system is < 45 $\mu$s. Specially in this paper we describe all electronic circuit and optical system design

  • PDF

무잔류 응력상태 결정을 통한 표면 잔류응력장 평가에의 레이저 간섭계 적용 (Application of Laser Interferometry for Assessment of Surface Residual Stress by Determination of Stress-free State)

  • 김동원;이낙규;나경환;권동일
    • 반도체디스플레이기술학회지
    • /
    • 제3권2호
    • /
    • pp.35-40
    • /
    • 2004
  • The total relaxed stress in annealing and the thermal strain/stress were obtained from the identification of the residual stress-free state using electronic speckle pattern interferometry (ESPI). The residual stress fields in case of both single and film / substrate systems were modeled using the thermo-elastic theory and the relationship between relaxed stresses and displacements. We mapped the surface residual stress fields on the indented bulk Cu and the 0.5 $\mu\textrm{m}$ Au film by ESPI. In indented Cu, the normal and shear residual stress are distributed over -1.7 GPa to 700 MPa and -800 GPa to 600 MPa respectively around the indented point and in deposited Au film on Si wafer, the tensile residual stress is uniformly distributed on the Au film from 500 MPa to 800 MPa. Also we measured the residual stress by the x-ray diffractometer (XRD) for the verification of above residual stress results by ESPI...

  • PDF

고출력 CW Nd:YAG 레이저를 이용한 인코넬 600의 용접 특성 (Welding Characteristics of Inconel 600 using a high power CW Nd:YAG Laser)

  • 유영태;신호준;임기건
    • 한국공작기계학회논문집
    • /
    • 제13권6호
    • /
    • pp.119-126
    • /
    • 2004
  • The welding characteristics of Inconel 600 Alloy using a continuous wave Nd:YAG laser are experimentally investigated. The major process parameters studied in the present laser welding experiment were the positions of focus, laser power and travel speed of laser bean We measured the fusion zone size and its shape using an optical microscope for the observation of cross-sectional area. We performed two tests regarding the tension and the micro hardness for welding quality estimation. Then we measured residual stress in welds by electronic speckle pattern interferometry(ESPI). In conclusion the optimum butt welding process parameters were 0.5mm focus position, 1.6kW laser power, 1m/min travel speed and 5.5$\ell$/min assist gas discharge.

Time-average ESPI에 의한 레이저용접 조건에 따른 공진주파수 특성 분석 (Resonance Frequency Analysis to Laser Welding Condition by Time-average ESPI)

  • 이유황;김경석;정성욱;최태호
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2004년도 추계학술대회 논문집
    • /
    • pp.245-249
    • /
    • 2004
  • This paper describes the vibration characteristics of Nd:YAG laser welding plates analyzed time-average Electronic Speckle Pattern Interferometry(ESPI). In laser welding, the travel speed has influence on a mechanical properties, such as elastic modules, response frequencies and so on, which is resulted on a residual stress of the welding zone. the response frequencies related to elastic modules are determined by time-average ESPI and the results, as compared to each condition, are used to estimate optimal condition of travel speed.

  • PDF

ESPI를 이용한 전자제품 패키지 열변형 신뢰성 평가에 관한 연구 (A Study on the Reliability Evaluation of Thermal Deformation of Electronic Product Package by ESPI)

  • 조지현;이재혁;박상영;장중순;김광섭
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제5권4호
    • /
    • pp.439-450
    • /
    • 2005
  • Thermal deformation of Digital Television effect friction noise directly. However there was no methods to find and to solve the thermal friction noise which is huge problem in Digital Television In this study, to figure out occurrence cause of friction noise of the product, we measured thermal deformation of the product to organize a triggering device united with Laser Doppler Vibrometer(LDV) which turned occurrence moment of thermal friction noise into a possibility to measure. In conclusion, we could offer an effective information of design, and ensured ESPI(Electronic Speckle Pattern Interferometry) measure technique which is more detailed than the past way.

  • PDF

무잔류 응력상태 결정을 통한 표면 잔류응력장 평가에의 레이저 간섭계 적용 (Application of Laser Interferometry for Assessment of Surface Residual Stress by Determination of Stress-free State)

  • 김동원;이낙규;최태훈;나경환;권동일
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2003년도 춘계학술대회
    • /
    • pp.25-30
    • /
    • 2003
  • The total relaxed stress in annealing and the thermal strain/stress were obtained from the identification of the residual stress-free state using electronic speckle pattern interferometry (ESPI). The residual stress fields in case of both single and film/substrate systems were modeled using the thermo-elastic theory and the relationship between relaxed stresses and displacements. We mapped the surface residual stress fields on the indented bulk Cu and the 0.5 ${\mu}m$ Au film by ESPI. In indented Cu, the normal and shear residual stress are distributed over -1.7 GPa to 700 MPa and -800 GPa to 600 MPa respectively around the indented point and in deposited Au film on Si wafer, the tensile residual stress is uniformly distributed on the Au film from 500 MPa to 800 MPa. Also we measured the residual stress by the x-ray diffractometer (XRD) for the verification of above residual stress results by ESPI.

  • PDF

3-D ESPI법을 이용한 단점용접부의 변형률 측정 (The Strain Measurement of One Point Spot Welded Zone Using the 3-D ESPI)

  • 차용훈;강대진;장훈;장경천;성백섭
    • 대한기계학회논문집A
    • /
    • 제32권7호
    • /
    • pp.597-601
    • /
    • 2008
  • Currently knowledge of strain in welds has mainly been obtained from strain gaging method: that is directly attaching most of the material to the gage. The very few non-contact methods are still in the early stage. One of the non-contact methods is by the use of the laser that has high-level of the accuracy for the measurement, and this laser also has excellent characteristics on which many studies for its applications are focused throughout the many fields. A method of study is on the measurement of the strain caused by the characteristics of the spot welded zone which is used with 3-D ESPI system that is functionally modified through the laser ESPI(Electronic Speckle Pattern Interferometry) system. This system employed the SGCC 1.2t which are mainly used for the steel plate such as automobile, structure, building material and electronic appliances.

레이저 간섭계를 이용한 배관 용접부 잔류응력 평가 (Evaluation of Residual Stress on Pipe Welded Joints Using Laser Interferometry)

  • 장호섭;나만균;김경석
    • 비파괴검사학회지
    • /
    • 제34권1호
    • /
    • pp.18-22
    • /
    • 2014
  • 용접 잔류응력은 용접공정에서 발생하는 하는데, 용접 구조물의 결함 유발 및 파괴의 주요 원인이 된다. 본 논문에서는 전자 처리 레이저 스페클 간섭법을 이용하여 원전 배관의 용접부 잔류응력을 측정하였다. 인장시험기를 이용하여 용접된 배관에 압축 하중을 가하였으며, 면내 변형 측정 간섭계를 이용하여 용접부와 모재부의 변형을 측정하였고, 제안된 수식에 의하여 탄성계수를 측정하였다. 용접 배관에 가해지는 하중에 따라 변형이 일정하게 증가하며, 용접 배관의 모재부와 용접부에 발생한 변형을 비교하였을 때, 모재부의 변형이 더 크게 나타남을 확인할 수 있었다. 용접 배관 모재부의 탄성계수는 202.46 GPa, 용접부의 탄성 계수는 212.14 GPa, 잔류응력은 6.29 MPa로 측정되었다.