Holographic optical element based digital speckle pattern shearing interferometer

Manoj Kumar, Chandra Shakher

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations

Abstract

Holographic optical element (HOE) based digital speckle pattern shearing interferometer (DSPSI) is presented. The proposed DSPSI setup consists of volume phase holographic (VPH) grating combined with ground glass (diffuser) to shear the incident wavefronts. The shear of the two wavefronts is controlled by the distance between VPH grating and the ground glass. The sheared wavefronts on the ground glass are imaged on the image detector by an imaging lens. As both interfering wavefronts are of almost equal intensities, the contrast of the digital speckle pattern shear interferometric fringes is optimum. The proposed DSPSI setup is used for the measurement of temperature and temperature distribution in butane diffusion flame under the influence of magnetic field. In DSPSI system for the measurement of temperature in gaseous flames, two speckle interferograms are recorded: One in absence of the flame and another in the presence of the flame. These two recorded speckle interferograms are subtracted to get fringe pattern corresponding to the change in refractive index. The phase information is extracted from the experimentally obtained single fringe pattern by using Riesz transform method. The obtained phase information is used to calculate the change in refractive index and hence the temperature inside the flame under study.

Original languageEnglish
Title of host publicationSpeckle 2018
Subtitle of host publicationVII International Conference on Speckle Metrology
EditorsLeszek R. Jaroszewicz, Malgorzata Kujawinska
PublisherSPIE
ISBN (Electronic)9781510622975
DOIs
StatePublished - 1 Jan 2018
Externally publishedYes
Event7th International Conference on Speckle Metrology, Speckle 2018 - Janow Podlaski, Poland
Duration: 10 Sep 201812 Sep 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10834
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference7th International Conference on Speckle Metrology, Speckle 2018
Country/TerritoryPoland
CityJanow Podlaski
Period10/09/1812/09/18

Keywords

  • Digital speckle pattern shear interferometer
  • Effect of magnetic field
  • Gaseous flame
  • Holographic optical element
  • Riesz transform
  • Temperature distribution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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