Speckle interferometry

Sirohi, R. S.

doi:10.1080/00107510110111119

Cited by 31 publications

(22 citation statements)

References 36 publications

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“…A large strain makes the interference fringe pattern high frequency due to the term of sin(Δφ/2) in Eq. (2). Therefore, the interference fringe cannot be identified.…”

Section: Journal Of Solid Mechanics and Materials Engineeringmentioning

confidence: 99%

“…When the surface is illuminated by two beams, the intensities of each speckle are modulated because of the superposition of the beams. The superposed intensity I is written as (2) …”

Section: Outline Of Electronic Speckle Pattern Interferometrymentioning

confidence: 99%

“…The interference fringe is given by the image subtraction of the deformed state from the initial state speckle pattern image. The intensity of the subtraction image I sub is calculated as (2) I sub = I u -…”

Section: Journal Of Solid Mechanics and Materials Engineeringmentioning

confidence: 99%

“…Electronic speckle pattern interferometry (ESPI) (1), (2) is a very sensitive and noncontact method for the measurement of surface deformation distribution. The basics of this method is the image subtraction of an initial state from a deformed state image of the speckle pattern.…”

Section: Introductionmentioning

confidence: 99%

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Electronic Speckle Pattern Interferometry with Optimum Image Extraction for Deformation Measurement under Environmental Disturbance

Arikawa

Nakaya

Yoneyama

2012

JMMP

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A method for extracting optimum images from a large amount of speckle images is proposed for ESPI measurement under environmental disturbance. During the measurement of static deformation under environmental disturbance, optimum images which can make interference fringes are extracted from the speckle images before the image subtraction. The extraction is performed based on the evaluation of the highest speckle contrast in time series value. The validity of the method is investigated by experiments under the environmental disturbance coming from the floor. Results indicate that the extraction method is effective and it is possible to measure static surface deformation by ESPI without a vibration isolator under environmental disturbance.

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“…A large strain makes the interference fringe pattern high frequency due to the term of sin(Δφ/2) in Eq. (2). Therefore, the interference fringe cannot be identified.…”

Section: Journal Of Solid Mechanics and Materials Engineeringmentioning

confidence: 99%

“…When the surface is illuminated by two beams, the intensities of each speckle are modulated because of the superposition of the beams. The superposed intensity I is written as (2) …”

Section: Outline Of Electronic Speckle Pattern Interferometrymentioning

confidence: 99%

Section: Journal Of Solid Mechanics and Materials Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electronic Speckle Pattern Interferometry with Optimum Image Extraction for Deformation Measurement under Environmental Disturbance

Arikawa

Nakaya

Yoneyama

2012

JMMP

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“…We have previously demonstrated such an intensity modulation arising from a gas cell that uses a diffusely reflective surface [25] . Sirohi has shown that the intensity modulation at the detector takes the form [26] ;…”

Section: Interferometric Specklementioning

confidence: 99%

Gas cells for tunable diode laser absorption spectroscopy employing optical diffusers. Part 2: Integrating spheres

2010

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New designs for gas cells are presented that incorporate transmissive or reflective optical diffusers. These components offer simple alignment and can disrupt the formation of optical etalons. We analyse the performance-limiting effects in these cells of random laser speckle (both objective and subjective speckle), interferometric speckle and self-mixing interference, and show how designs can be optimised. A simple, single pass transmissive gas cell has been studied using wavelength modulation spectroscopy to measure methane at 1651nm. We have demonstrated a short-term noise equivalent absorbance (NEA, 1σ) of 2×10 -5 , but longer term drift of up to 3×10 -4 over 22 hours. PACS codes 07

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Optical Measurement Techniques

Sirohi

Fringe 2005

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Speckle interferometry

Cited by 31 publications

References 36 publications

Electronic Speckle Pattern Interferometry with Optimum Image Extraction for Deformation Measurement under Environmental Disturbance

Electronic Speckle Pattern Interferometry with Optimum Image Extraction for Deformation Measurement under Environmental Disturbance

Gas cells for tunable diode laser absorption spectroscopy employing optical diffusers. Part 2: Integrating spheres

Optical Measurement Techniques

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