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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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Related Experiment Video

Updated: Apr 26, 2026

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Homodyne digital interferometry for a sensitive fiber frequency reference.

Silvie Ngo, Terry G McRae, Malcolm B Gray

|August 5, 2014

Summary

This summary is machine-generated.

Digitally enhanced homodyne interferometry in an all-fiber Michelson interferometer achieved unprecedented frequency reference stability. This breakthrough meets critical requirements for the Gravity Recovery and Climate Experiment Follow On mission and future space geodesy applications.

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Area of Science:

Physics
Optical Interferometry
Signal Processing

Background:

Achieving high interferometric sensitivity typically requires complex optical configurations.
Digitally enhanced homodyne interferometry offers a method to simplify optical setups by moving complexity to digital signal processing.
The Gravity Recovery and Climate Experiment Follow On (GRACE-FO) mission has stringent stability requirements for its instruments.

Purpose of the Study:

To demonstrate the efficacy of digitally enhanced homodyne interferometry in an all-fiber system.
To achieve frequency reference stability suitable for the GRACE-FO mission.
To explore stability performance at lower frequencies for future mission objectives.

Main Methods:

Implementation of a simple, all-fiber Michelson interferometer.
Application of digitally enhanced homodyne interferometry techniques.
Analysis of frequency domain stability and fractional Allan deviation.

Main Results:

Achieved frequency reference stability better than 20 Hz/√Hz from 10 mHz to 1 Hz.
Satisfied GRACE-FO mission stability requirements for the first time in an all-fiber system.
Demonstrated stability meeting future mission objectives down to 1 mHz.
Attained a fractional Allan deviation of 3.3 × 10(-17) at 55 seconds integration time.

Conclusions:

Digitally enhanced homodyne interferometry provides a robust and optically simple approach to high-sensitivity interferometry.
The developed all-fiber system meets current and future stability needs for space-based gravitational measurements.
This technique advances the feasibility of advanced interferometric missions using fiber optics.