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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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The instrument function of a wide angle Michelson interferometer spectrometer.

¹NASA, Goddard Space Flight Center,Greenbelt, Maryland 20771, USA.

|January 12, 2010

Summary

This study introduces a new method for wide-angle Michelson interferometer spectrometers, enhancing field of view and reducing interfaces. The instrument

Area of Science:

Optics and Photonics
Spectroscopy
Interferometry

Background:

Conventional Michelson interferometers face limitations in field of view and optical complexity.
Developing advanced spectroscopic instruments is crucial for various scientific applications.

Purpose of the Study:

To derive the instrument function for a wide-angle Michelson interferometer spectrometer.
To explore a novel method for computing phase differences in interferometric systems.
To investigate the impact of material properties and field of view on instrument performance.

Main Methods:

A novel computational approach was used to determine the phase difference between interfering beams.
The instrument function was derived using easily measurable parameters.

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A working model was constructed to validate theoretical findings.

Main Results:

The derived instrument function is expressed in terms of known or measurable optical properties.
The interferometer design achieves optical immersion using solid materials, reducing reflective interfaces.
A linear relationship was identified between the allowable field of view and the refractive index of the cube material.
Experimental validation produced clear fringes using both white light and mercury green light.

Conclusions:

The novel method provides an effective way to characterize wide-angle Michelson interferometer spectrometers.
Solid immersion designs offer significant advantages in field of view and optical efficiency.
The findings enable the design of more versatile and high-performance spectroscopic instruments.