한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제26권7호
  • /
  • Pages.65-72
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  • 2009
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

Modulating Laser를 이용한 ESPI System algorithm 개발에 관한 연구

Research about ESPI System Algorithm Development that Use Modulating Laser

  • 김성종 (전북대학교 대학원 기계설계학과) ;
  • 강영준 (전북대학교 기계설계공학부) ;
  • 박낙규 (전북대학교 대학원 기계설계학과) ;
  • 이동환 (전북대학교 기계설계공학부)
  • Kim, Seong-Jong (Department of Mechanical Design Engineering, Chonbuk Univ.) ;
  • Kang, Young-June (Department of Mechanical Design Engineering, Chonbuk Univ.) ;
  • Park, Nak-Kyu (Department of Mechanical Design Engineering, Chonbuk Univ.) ;
  • Lee, Dong-Hwan (Department of Mechanical Design Engineering, Chonbuk Univ.)
  • 발행 : 2009.07.01
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초록

Laser interferometry is widely used as a measuring system in many fields because of its high resolution and its ability to measure a broad area in real-time all at once. In conventional laser interferometry, for example out-of-plane ESPI (Electronic Speckle Pattern Interferometry), in plane ESPI, shearography and holography, it uses PZT or other components as a phase shift instrumentation to extract 3-D deformation data, vibration mode and others. However, in most cases PZT has some disadvantages, which include nonlinear errors and limited time of use. In the present study, a new type of laser interferometry using a laser diode is proposed. Using Laser Diode Sinusoidal Phase Modulating (LD-SPM) interferometry, the phase modulation can be directly modulated by controlling the laser diode injection current thereby eliminating the need for PZT and its components. This makes the interferometry more compact. This paper reports on a new approach to the LD (Laser Diode) Modulating interferometry that involves four-frame phase shift method. This study proposes a four-frame phase mapping algorithm, which was developed to have a guaranteed application, to stabilize the system in the field and to be a user-friendly GUI. In this paper, the theory for LD wavelength modulation and sinusoidal phase modulation of LD modulating interferometry is shown. Using modulating laser and research of measurement algorithm does comparison with existent ESPI measurement algorithm. Algorithm measures using GPIB communication through most LabVIEW 8.2. GPIB communication does alteration through PC. Transformation of measurement object measures through modulating laser algorithm that develops. Comparison of algorithm of modulating laser developed newly with existent PZT algorithm compares transformation price through 3-D. Comparison of 4-frame phase mapping, unwrapping, 3-D is then introduced.

키워드

참고문헌

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