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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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Spectrally resolved interferometry based on a tilt phase-shifting iteration method.

Weihao Zhang, Hangying Zhang, Kai Meng

|May 1, 2025

Summary

This summary is machine-generated.

This study introduces a novel tilt phase-shifting iterative method for spectral interferometry. It accurately extracts phase information from spectral interferograms, even with random phase shifts and high noise.

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Area of Science:

Optical Metrology
Interferometry
Signal Processing

Background:

Phase extraction from spectral interferograms faces challenges due to uneven phase shifts.
Existing methods struggle with random phase shifts and high-noise environments.

Purpose of the Study:

To develop a novel method for accurate phase extraction in spectrally resolved interferometry (SRI).
To overcome limitations of traditional phase-shifting techniques in spectral interferometry.

Main Methods:

A tilt phase-shifting iterative method is proposed, integrating spectral interferogram reconstruction.
The method reconstructs spectral interferograms to create a linear tilt in phase shifts.
Phase extraction is performed using at least three frames with random phase shifts.

Main Results:

The novel method achieves high-quality phase extraction, overcoming limitations of random phase shifts.
Demonstrated superior accuracy in profile measurements compared to previous methods.
Effective performance under high-noise conditions and with varying object heights.

Conclusions:

The proposed tilt phase-shifting iterative method offers a robust solution for phase extraction in SRI.
This approach enhances accuracy and reliability in challenging measurement scenarios.