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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Optical microfiber mode interferometer for temperature-independent refractometric sensing.

G Salceda-Delgado1, D Monzon-Hernandez, A Martinez-Rios

  • 1Centro de Investigaciones en Optica A.C., Loma del Bosque 115, col. Lomas del Campestre, Leon, Gto., 37150 Mexico.

Optics Letters
|June 5, 2012
PubMed
Summary
This summary is machine-generated.

We developed a novel optical microfiber interferometer for precise, temperature-insensitive refractive index sensing. This device accurately measures external refractive index changes using spectral analysis, offering high resolution for various applications.

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Area of Science:

  • Photonics and Optical Sensing
  • Nanofiber Technology
  • Interferometry

Background:

  • Optical fiber sensors are crucial for measuring physical parameters.
  • Existing methods for refractive index sensing can be temperature-dependent.
  • High-resolution, stable sensing platforms are needed.

Purpose of the Study:

  • To demonstrate a functional optical microfiber mode interferometer.
  • To investigate its application in absolute, temperature-insensitive refractive index sensing.
  • To achieve high-resolution measurements of the surrounding refractive index.

Main Methods:

  • Fabrication of an optical microfiber with a 10 μm diameter.
  • Utilizing abrupt transitions to create an interferometer.
  • Analyzing the transmission spectrum's sinusoidal pattern and its period.
  • Employing Fast Fourier Transform (FFT) for accurate period measurement.

Main Results:

  • The interferometer exhibits a sinusoidal transmission spectrum due to mode beating.
  • The spectral pattern's period is highly sensitive to the surrounding refractive index.
  • The device demonstrates temperature-insensitivity.
  • A refractive index measurement range of 1.33 to 1.428 was achieved.
  • A maximum resolution of approximately 3.7×10⁻⁶ was obtained.

Conclusions:

  • The optical microfiber mode interferometer is a viable tool for absolute refractive index sensing.
  • Its temperature-insensitive nature enhances reliability in diverse environments.
  • The FFT-based analysis provides accurate and high-resolution measurements.