Multiple-pattern generating piezoelectric fiber scanner toward endoscopic applications

Tekpinar, Miyase; Khayatzadeh, Ramin; Ferhanoğlu, Onur

doi:10.1117/1.oe.58.2.023101

Cited by 11 publications

(8 citation statements)

References 20 publications

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“…A circular section optical fiber is characterized by having the same fundamental frequency along two directions. It is possible to get a circular-shaped pattern from the fiber tip by exciting it in the two directions with a 90 • phase shift [133]. As stated earlier, it is also possible to get a circular-shaped pattern from the fiber tip by exciting it in a single direction at a second mode of resonance due to nonlinear coupling with longitudinal inertia [85].…”

Section: Circular Scanningmentioning

confidence: 97%

Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art

2020

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The growth and development of optical components and, in particular, the miniaturization of micro-electro-mechanical systems (MEMSs), has motivated and enabled researchers to design smaller and smaller endoscopes. The overarching goal of this work has been to image smaller previously inaccessible luminal organs in real time, at high resolution, in a minimally invasive manner that does not compromise the comfort of the subject, nor introduce additional risk. Thus, an initial diagnosis can be made, or a small precancerous lesion may be detected, in a small-diameter luminal organ that would not have otherwise been possible. Continuous advancement in the field has enabled a wide range of optical scanners. Different scanning techniques, working principles, and the applications of endoscopic scanners are summarized in this review.

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Section: Circular Scanningmentioning

confidence: 97%

Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art

2020

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“…In this case, the dimensions of the cantilevered fiber and the mode optimization allowed the fiber tip to interchangeably follow a raster, spiral, or Lissajous scanning pattern by simply changing the actuation parameters. A schematic diagram of such a model is shown in Figure 8 A [ 104 ]. The different scanning patterns were projected on a United States Air Force (USAF) resolution target to evaluate the image uniformity.…”

Section: Actuators In Cantilever-based Endoscopic Devicesmentioning

confidence: 99%

“…From Figure 8 B, it can be seen that a raster scan provides a uniform illumination on the target ((a) within Figure 8 B), while the spiral one is characterized by decreasing illumination along the radius ((b) within Figure 8 B). The illumination in the case of a Lissajous scan is highly dependent on the fill factor ((c) within Figure 8 B) [ 104 ].…”

Section: Actuators In Cantilever-based Endoscopic Devicesmentioning

confidence: 99%

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Scanning and Actuation Techniques for Cantilever-Based Fiber Optic Endoscopic Scanners—A Review

Kaur

Lane

Menon

2021

Sensors

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Endoscopes are used routinely in modern medicine for in-vivo imaging of luminal organs. Technical advances in the micro-electro-mechanical system (MEMS) and optical fields have enabled the further miniaturization of endoscopes, resulting in the ability to image previously inaccessible small-caliber luminal organs, enabling the early detection of lesions and other abnormalities in these tissues. The development of scanning fiber endoscopes supports the fabrication of small cantilever-based imaging devices without compromising the image resolution. The size of an endoscope is highly dependent on the actuation and scanning method used to illuminate the target image area. Different actuation methods used in the design of small-sized cantilever-based endoscopes are reviewed in this paper along with their working principles, advantages and disadvantages, generated scanning patterns, and applications.

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“…In recent years, in-line fiber interferometer sensors are featured with high sensitivity, high accuracy, high environmental stability, and high signal capacity, and have been widely employed in many industrial and scientific applications [ 1 , 2 , 3 , 4 ]. Compared with the dual-fiber interferometer sensor, the in-line fiber interferometer sensor based on core mode and cladding mode interference is a more compact and efficient device, which is very suitable for industrial strain measurement including the health monitoring of bridge, propeller of the ships, and the blades of the wind turbines and aircraft engines [ 5 , 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Fiber Interferometric Strain Sensors Based on Elongated Fiber Abrupt Tapers

2022

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We demonstrate high-sensitivity fiber strain sensors based on an elongated abrupt taper. The fiber abrupt taper, with a tapered diameter ranging from 40–60 μm, was made by using a hydrogen microflame to break the waveguide adiabaticity so as to convert the fundamental mode into cladding modes. The abrupt taper was further uniformly tapered by using a normal moving flame with a torch diameter of 7 mm to elongate the tapered region until the tapered diameter was down to 2.5–5 μm. The excited high-order modes were confined to propagate along the cladding and then recombined at the rear edge of the fiber taper to produce interferences with extinction ratios of up to 16 dB. The tapered region was pulled outwardly to change the optical path difference (OPD) between modes to measure the tensile strain with all the interfering wavelengths blue-shifted. The measured best strain sensitivity was 116.21 pm/με and the coefficient of determination R2 of linear fitting exhibits high linearity. This strain sensor based on elongated abrupt taper is several times higher than that of most of the fiber strain sensors ever reported.

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Multiple-pattern generating piezoelectric fiber scanner toward endoscopic applications

Cited by 11 publications

References 20 publications

Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art

Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art

Scanning and Actuation Techniques for Cantilever-Based Fiber Optic Endoscopic Scanners—A Review

High Sensitivity Fiber Interferometric Strain Sensors Based on Elongated Fiber Abrupt Tapers

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