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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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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Published on: December 5, 2025

Direct spectral phase function calculation for dispersive interferometric thickness profilometry.

Daesuk Kim, Soohyun Kim

|June 2, 2009

Summary

This summary is machine-generated.

A new spectral phase shifting method offers a simple, fast way to calculate spectral phase functions. This direct calculation maintains high accuracy, matching traditional Fourier transform approaches.

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Area of Science:

Optics and Photonics
Spectroscopy
Metrology

Background:

Accurate spectral phase measurement is crucial in various scientific and technological fields.
Traditional methods like Fourier transform (FT) can be computationally intensive or complex.
Developing simpler, faster, yet accurate phase calculation techniques is an ongoing research objective.

Purpose of the Study:

To introduce and validate a direct spectral phase function calculation method.
To demonstrate the simplicity and speed of the proposed method.
To compare its accuracy against established Fourier transform-based techniques.

Main Methods:

Development of a direct spectral phase calculation algorithm.
Implementation of spectral phase shifting techniques.
Experimental validation of the proposed method using a spectral phase shifting setup.

Main Results:

The direct spectral phase function calculation method was successfully implemented.
Experimental results confirmed the method's simplicity and speed.
The accuracy of the direct method was found to be comparable to the Fourier transform approach.

Conclusions:

The direct spectral phase function calculation method provides an efficient alternative.
This technique simplifies spectral phase analysis without compromising measurement accuracy.
It offers a practical solution for applications requiring rapid and precise spectral phase determination.