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IR Spectrometers

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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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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Fiber-optic Michelson interferometer using an optical power divider.

M Imai, T Ohashi, Y Ohtsuka

|August 21, 2009

Summary

This summary is machine-generated.

A novel fiber-optic interferometer measures micrometer displacements using an optical homodyne technique. Sensitivity is enhanced by optimizing the minimum detectable beat signal for improved vibration measurement.

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Implementation of a Reference Interferometer for Nanodetection

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Published on: April 26, 2014

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Last Updated: Jun 20, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

Optoelectronics
Interferometry
Vibration Measurement

Background:

Fiber-optic sensors offer high sensitivity for displacement measurements.
Michelson interferometers are widely used but can be limited by environmental factors.
Optical homodyne detection provides a sensitive method for signal recovery.

Purpose of the Study:

To develop and evaluate a fiber-optic interferometer for micrometer-order displacement measurement.
To investigate methods for enhancing the sensitivity of the fiber-optic interferometer.
To apply optical homodyne detection for precise vibration analysis.

Main Methods:

Construction of a Michelson interferometer using a multimode fiber-optic power divider.
Application of an optical homodyne technique for signal processing.
Analysis of the minimum detectable beat signal to assess sensitivity.

Main Results:

Successful measurement of micrometer-order displacements of a vibrating object.
Demonstration of the fiber-optic interferometer's capability in vibration analysis.
Identification of beat signal optimization as a key factor for sensitivity improvement.

Conclusions:

The developed fiber-optic interferometer is effective for measuring small displacements.
Optical homodyne detection enhances measurement precision.
Further improvements in sensitivity are achievable by minimizing detectable beat signals.