APPLICABILITY OF TIME AVERAGE GEOMETRIC MOIRe FOR VIBRATING ELASTIC STRUCTURES

Ragulskis, Minvydas; Ragulskis, L.; Maskelianas, R.

doi:10.1111/j.1747-1567.2004.tb00174.x

Cited by 9 publications

(15 citation statements)

References 5 publications

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“…erage geometric moiré methods. 7 The ability to exploit the natural microstructure of the surface as a stochastic grating would eliminate this restraint. This paper tries to show that such techniques can be developed and successfully applied for analysis of dynamic displacements.…”

Section: Fig 1: One-dimensional Examplementioning

confidence: 99%

Identification of in-Plane Vibrations Using Time Average Stochastic Moire

Ragulskis

Maskeliūnas

Saunorienė

2005

Experimental Techniques

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Section: Fig 1: One-dimensional Examplementioning

confidence: 99%

Identification of in-Plane Vibrations Using Time Average Stochastic Moire

Ragulskis

Maskeliūnas

Saunorienė

2005

Experimental Techniques

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“…(1)) is formed on the surface of one-dimensional non-deformable body and is harmonically oscillated around the state of equilibrium according to harmonic function: ⋅ sin ( + ), where is the amplitude of harmonic oscillations, is the frequency and is the phase. Then grey-scale level of moiré grating at coordinate at time moment can be expressed [12]:…”

Section: Optical Backgroundmentioning

confidence: 99%

“…Note, that oscillation frequency and phase have no influence on the formation of time-averaged image [11,12]. Time-averaged image becomes continuously grey at the roots of :…”

Section: Optical Backgroundmentioning

confidence: 99%

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Near-optimal pitch of a moiré grating for image hiding applications in dynamic visual cryptography

Saunorienė¹,

Aleksiene²,

Ragulskiene³

2017

Vib. proced.

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Abstract. Dynamic visual cryptography is based on hiding of a dichotomous secret image in the regular moiré grating. One pitch of the moiré grating is used to represent the secret image and a slightly different pitch of another moiré grating is used to form the background. The secret is decoded in the form of a pattern of a time-averaged moiré fringe when the cover image is oscillated according to a predefined law of motion. The security of the encoding and the sharpness of the decoded secret are mostly influenced by the selection of the pitches of moiré grating. This paper proposes scheme for the determination of near-optimal pitches of the moiré grating for image hiding in dynamic visual cryptography.

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“…Double‐exposure geometric moiré techniques can be extended to time‐average geometric moiré methods when the moiré grating is formed on the surface of elastic oscillating structures, and time‐averaging techniques are used for registration of time‐averaged patterns of fringes 6,7 . Let us assume that the deflections from the state of equilibrium oscillate in time.…”

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confidence: 99%