Simultaneous measurement of concentration and temperature in liquid sample using multi-mode interference fiber comb

Ryo Oe, Takeo Minamikawa, Shuji Taue, Hideki Fukano, Yoshiaki Nakajima, Kaoru Minoshima, Takeshi Yasui

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

Abstract

Optical frequency combs (OFCs) have attracted attention as optical frequency rulers due to their tooth-like discrete spectra together with their inherent mode-locking nature and phase-locking control to a frequency standard. Based on this concept, their applications until now have been demonstrated in the fields of optical frequency metrology. However, if the utility of OFCs can be further expanded beyond their application by exploiting new aspects of OFCs, this will lead to new developments in optical metrology and instrumentation. Previously, we reported a fiber sensing application of OFCs based on a coherent link between the optical and radio frequencies, enabling high-precision refractive index (RI) measurement based on frequency measurement in radio-frequency (RF) region. Our technique encoded an RI change of a liquid sample into a repetition frequency of OFC by a combination of an intracavity multi-mode-interference fiber sensor and wavelength dispersion of a cavity fiber. Then, the change in refractive index was read out with an RI resolution of 4.88 × 10 -6 RIU and an RI accuracy of 5.35 × 10 -5 RIU by measuring the repetition frequency in RF region based on a frequency standard. However, the temperature instability of a sample limits the performance because a refractive index is a function of temperature. In this paper, we demonstrate simultaneous measurement of concentration and temperature in a sample by measuring RI-dependent repetition frequency shift and optical spectrum shift.

Original languageEnglish
Title of host publicationOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX
EditorsIsrael Gannot, Israel Gannot
PublisherSPIE
ISBN (Electronic)9781510623866
DOIs
Publication statusPublished - Jan 1 2019
EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX 2019 - San Francisco, United States
Duration: Feb 2 2019Feb 3 2019

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume10872
ISSN (Print)1605-7422

Conference

ConferenceOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX 2019
CountryUnited States
CitySan Francisco
Period2/2/192/3/19

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Keywords

  • Fiber sensor
  • Multi-mode interference
  • Optical frequency comb
  • Radio frequency
  • Refractive index

ASJC Scopus subject areas

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

Cite this

Oe, R., Minamikawa, T., Taue, S., Fukano, H., Nakajima, Y., Minoshima, K., & Yasui, T. (2019). Simultaneous measurement of concentration and temperature in liquid sample using multi-mode interference fiber comb. In I. Gannot, & I. Gannot (Eds.), Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX [1087215] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 10872). SPIE. https://doi.org/10.1117/12.2509539