Three-dimensional optical profilometry using a four-core optical fibre

Bulut, Karahan; Incı, Mehmet Nacı

doi:10.1016/j.optlastec.2004.07.005

Cited by 26 publications

(11 citation statements)

References 15 publications

(19 reference statements)

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“…The superposition of these enables an interferometric fringe pattern, which is shown in Figure 1b. The intensity distribution of the fringe pattern from a four-core optical fiber is given by [9]:…”

Section: Principle Of the Methodsmentioning

confidence: 99%

Investigation of a novel temperature-sensing mechanism based on strain-induced optical path-length difference in a multicore optical fiber

Gökbulut¹,

Güvenç²,

Incı³

2017

Turk J Phys

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Abstract:A four-core optical fiber is employed to investigate a novel temperature-sensing mechanism, which is based on the strain-induced optical path-length difference between the fiber core pairs. A short segment of a four-core fiber is wound around a solid stainless steel cylinder to form a tight circular loop, which is exposed to temperatures of up to 100 • C. Temperature-induced radial expansion of the stainless steel cylinder causes a shear strain in the fiber and introduces an optical path-length difference between the fiber core pairs. This results in a total phase shift of about 20.40 ± 0.29 rad in the interference pattern of the four-core fiber, which is monitored by a CMOS camera. The temperature-induced phase and strain sensitivities are measured to be 3.74 rad/m• C and 0.18 µε / • C, respectively.

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Section: Principle Of the Methodsmentioning

confidence: 99%

Investigation of a novel temperature-sensing mechanism based on strain-induced optical path-length difference in a multicore optical fiber

Gökbulut¹,

Güvenç²,

Incı³

2017

Turk J Phys

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“…In the case of active stereovision, the photodetectors are simpler but this method requires precise fabricated diffraction gratings (4)(5)(6)(7). Another strategy is to do the projection of interferograms created by muticore fibre-based instruments (8,9).…”

Section: Introductionmentioning

confidence: 99%

Tri-Dimensional Optical Inspection Based on Flexible Image Guide: First Step Toward 3D Industrial Endoscopy

Dupont

Lamarque

Prelle

et al. 2012

Volume 4: Advanced Manufacturing Processes; Biomedical Engineering; Multiscale Mechanics of Biological Tissues; Sciences, Engin

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3D optical endoscopy is now a major challenge to allow the high resolution inspection of industrial equipments. The proposed instrument is based on a flexible image guide (70 000 fibres) and a Digital Micro mirror Device (DMD, 1024 × 768 “on-off” micro mirrors). The optical design is as follows: the light emitted by a 532 nm laser diode is dynamically structured by the DMD chip as a fringes pattern which is phase-shifted due to the active control of the DMD chip and projected onto an object on a circular field of 6 mm in diameter. Due to a telecentric and binocular arrangement that creates a stereoscopic angle, it is possible to get a depth of field of 2 mm along the optical axis without keystone distortions and few disturbances created by defocus and coma aberrations. Then, images are captured by a 1024 × 768 digital camera (not yet moved away by fibres) at 15 fps and directly used in the reconstruction algorithm to access the tri-dimensional shape of the unpainted object. The results are compared to incoherent white light results obtained with white painted mechanical objects. The lateral resolution is 31.3 μm and the RMS axial resolution is 10 μm for the laser-based design after speckle attenuation.

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“…Special multicore fiber can be used for in-line Mach-Zehnder interferometer. The special four core optical fiber has been used in Mach-Zehnder interferometer system for two-dimensional optical profilometry [1].…”

Section: Introductionmentioning

confidence: 99%