An alternative to white light interferometric sensing

“…where and are time-dependent complex amplitudes, and are unit vectors in -and -direction. In general, we shall have (4) where is the (real) ratio of amplitudes and is the timedependent phase shift induced by the movement of the test object. For one-dimensional (1-D) movements, we can write (5) where is a constant phase term, is the laser wavelength and is the fiber-target distance.…”

Section: Principle Of Operationmentioning

confidence: 99%

Optical fiber vibration sensor using (Pancharatnam) phase step interferometry

Ferrari¹,

Frins

Dultz

1997

J. Lightwave Technol.

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A fiber-optic vibration sensor based on polarizationand phase-step interferometry is reported. Left-and rightcircularly polarized light coming back from the reference and signal arms of a modified Michelson fiber interferometer is processed with an array of five linear analyzers separated angular steps of =4 (rad) from each other. Thus, five interference patterns are acquired simultaneously and the dynamical phase retrieval problem is reduced to five-step interferometry in the time-domain. A vibration sensor as described above was built by the authors and its performance was investigated.

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“…These two factors of color and gloss are generally not independent, for example it is common to perceive the color of a surface being less intense for matte finishes compared to glossy ones [2,4,5,7,8]; clear coatings have similarly been noted to reduce the color intensity of underlying surfaces [9]. Surface topography affects both color and gloss and can be referring to purposefully applied surface textures, macroscopic defects like sink marks and weld lines, or microscopic defects like microcracking, poor pigment and filler dispersion [10][11][12], or crystalline rearrangement [3].…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Gloss and Color of Decorative Pressure Sensitive Adhesive Films During Thermomechanical Deformation

Takács

Thompson

Vlachopoulos

et al. 2016

Polymer Engineering & Sci

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Decorative polymer films are finding applications in processes that require forming at elevated temperatures and significant strain. In order to satisfy their function in these applications, the appearance of these films must remain unaltered or at least any changes must be predictable. This paper examines four different high gloss decorative films comprised of different materials in the layers of their construction. The films were uniaxially stretched up to failure (which was up to 75% strain) at isothermal conditions of 25, 40, or 758C and then examined. Gloss (at 208) was the most strongly altered parameter concerning the appearance of the films after thermomechanical deformation while color intensity was relatively unaffected. The change in gloss was higher for the two amorphous films compared to the two that exhibited crystallinity. The films were analyzed for their surface roughness using a white light interferometer, for their crystallinity by X-ray diffraction and for their morphology by atomic force microscopy

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An alternative to white light interferometric sensing

Cited by 6 publications

References 8 publications

<title>Model analysis and optimal design of a scanning interferometric distance sensing head</title>

<title>Model analysis and optimal design of a scanning interferometric distance sensing head</title>

Optical fiber vibration sensor using (Pancharatnam) phase step interferometry

Factors Affecting Gloss and Color of Decorative Pressure Sensitive Adhesive Films During Thermomechanical Deformation

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