Fabrication of bundle-structured tube-leaky optical fibers for infrared thermal imaging

T. Kobayashi, Takashi Katagiri, Yuji Matsuura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Bundled glass tubular fibers were fabricated by glass drawing technique for endoscopic infrared-thermal imaging. The bundle fibers were made of borosilicate glass and have a structure like a photonic crystal fiber having multiple hollow cores. Fabricated fibers have a length of 90 cm and each pixel sizes are less than 80 μm. By setting the thickness of glass wall to a quarter-wavelength optical thickness, light is confined in the air core as a leaky mode with a low loss owing to the interference effect of the thin glass wall and this type of hollow-core fibers is known as tube leaky fibers. The transmission losses of bundled fibers were firstly measured and it was found that bundled tube-leaky fibers have reasonably low transmission losses in spite of the small pixel size. Then thermal images were delivered by the bundled fibers combining with an InSb infrared camera. Considering applications with rigid endoscopes, an imaging system composed of a 30-cm long fiber bundle and a half-ball lens with a diameter of 2 mm was fabricated. By using this imaging system, a metal wire with a thickness of 200 μm was successfully observed and another test showed that the minimum detected temperature was 32.0 °C and the temperature resolution of the system was around 0.7 °C.

Original languageEnglish
Title of host publicationOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII
EditorsIsrael Gannot, Israel Gannot
PublisherSPIE
ISBN (Electronic)9781510605572
DOIs
Publication statusPublished - 2017 Jan 1
EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII - San Francisco, United States
Duration: 2017 Jan 282017 Jan 29

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume10058
ISSN (Print)1605-7422

Other

OtherOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII
CountryUnited States
CitySan Francisco
Period17/1/2817/1/29

Keywords

  • Hollow optical fibers
  • Infrared thermal imaging
  • Tube-leaky waveguide

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Kobayashi, T., Katagiri, T., & Matsuura, Y. (2017). Fabrication of bundle-structured tube-leaky optical fibers for infrared thermal imaging. In I. Gannot, & I. Gannot (Eds.), Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII [100580X] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 10058). SPIE. https://doi.org/10.1117/12.2249663