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IR Spectrometers01:25

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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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Temporal phase unwrapping applied to wavelength-scanning interferometry.

L Paulsson1, M Sjödahl, J Kato

  • 1Division of Experimental Mechanics, Luleå University of Technology, S-971 87 Luleå, Sweden.

Applied Optics
|March 20, 2008
PubMed
Summary

This study introduces temporal phase unwrapping combined with wavelength-scanning interferometry for precise measurements. The methods accurately measure a 10-micrometer step using an external-cavity laser diode.

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Area of Science:

  • Optical metrology
  • Precision measurement science

Background:

  • Wavelength-scanning interferometry (WSI) is a powerful technique for optical measurements.
  • Temporal phase unwrapping is crucial for resolving phase ambiguities in interferometric data.

Purpose of the Study:

  • To demonstrate the efficacy of temporal phase unwrapping integrated with WSI.
  • To evaluate two distinct phase unwrapping strategies for interferometric measurements.

Main Methods:

  • Implementation of temporal phase unwrapping algorithms.
  • Utilizing wavelength-scanning interferometry with an external-cavity laser diode.
  • Comparison of reversed exponential sequence fitting and complex Fourier-transform ranging for phase unwrapping.

Main Results:

  • Successful application of temporal phase unwrapping in WSI.
  • Accurate measurement of a 10-micrometer step was achieved.
  • Performance comparison of the two unwrapping strategies was conducted.

Conclusions:

  • Temporal phase unwrapping is a viable and effective method for WSI.
  • The choice of unwrapping strategy impacts measurement accuracy and applicability.
  • This integrated approach enhances the precision of optical metrology techniques.