Slightly dispersive white-light spectral interferometry to measure distances and displacements

Hlubina, Petr; Gurov, Igor P.; Chugunov, Vladimir

doi:10.1078/0030-4026-00281

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…We obtained the thickness t = 53.18 im with a standard deviation of 0.14 1am. 15 Once the thickness t and the spectral phase 8(A) were obtained, the mirror position L in Eq. (11) can be determined precisely by a least-squares fitting of the theoretical spectral interferogram (14) to the recorded one.…”

Section: Resultsmentioning

confidence: 99%

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<title>Applications of dispersive white-light spectral interferometry in optics</title>

Hlubina

2006

SPIE Proceedings

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Various original applications of dispersive white-light spectral interferometry employing a low-resolution spectrometer and based on the equalization wavelength determinations are reviewed. First, the differential group refractive index dispersion or the chromatic dispersion of a dispersive sample of known thickness is measured determining the equalization wavelength as a function of the displacement of the interferometer mirror. Similarly, the effective thickness of a dispersive sample is determined measuring the mirror displacement as a function of the group refractive index of material. Second, the technique, which needs no phase retrieving procedure to be applied, is used to measure mirror distances and displacements when dispersion in a two-beam interferometer is known. Third, a technique of dispersive spectral interferometry is used for a slightly dispersive interferometer including the effect of thin films. The technique, which needs phase retrieving procedure to be applied in processing spectral interferograms resolved over a wide spectral range, is used to determine the spectral phase of thin films or the positions of the interferometer mirror.

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Section: Resultsmentioning

confidence: 99%

“…1 Vj , we obtain LLmax (2V2 ln 1O/ir)A2/L\R 1.36A2/L\R. (15) Assuming a case of a fiber-optic spectrometer with LAR = 3 nm, the maximum range of the displacements of the interferometer mirror in the above-defined wavelength range is lXLmax 110 ,im.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

<title>Applications of dispersive white-light spectral interferometry in optics</title>

Hlubina

2006

SPIE Proceedings

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“…In contrast with the laser interferometer, there is a compensation plate placed in reference arm of the white-light interferometer. The compensation plate is used for compensation of light dispersion caused by the passage of the white-light beam through the beam splitter 8 . For the interference fringe monitoring, a simple photodetector with a 2 mm diameter of an active area was used.…”

Section: Light Source Spectrum Modelingmentioning

confidence: 99%

Light source for low-coherence interferometry surface diagnostics

et al. 2011

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We describe in this paper a pilot experiment of optimization of a white-light source for a low-coherence interferometry. The white-light source combines the light beams generated with colour LEDs. By modelling of the white light spectra, a contrast of a white light interference fringe could be changed and set to the maximal value.The second part of this paper is a description of a white-light fringe analysis ensured with a low-cost colour CCD camera. The used detection technique employs a phase-crossing algorithm which identifies a zero optical path difference as the point where the phase difference between the red, green and blue part of the white-light interference fringe becomes equal to zero.The optimized white light source is designed to be a crucial part of an experimental setup for the surface diagnostics and automatic calibration of gauge blocks.

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“…In contrast with the laser interferometer, there is a compensation plate placed in the reference arm of the whitelight interferometer. The compensation plate is used for the compensation of the light dispersion caused by the passage of the white-light beam through the beam splitter [7].…”

Section: Interferometric Arrangementmentioning

confidence: 99%

White-light fringe detection based on a novel light source and colour CCD camera

Buchta

Mikel

Lazar

2011

Meas. Sci. Technol.

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We describe in this paper a pilot experiment of optimization of a white-light source for a low-coherence interferometry. The white-light source combines the light beams generated with colour LEDs. By modelling the white-light spectra, the contrast of a white-light interference fringe could be changed and set to the maximal value. The second part of this paper is a description of a white-light fringe analysis ensured with a low-cost colour CCD camera. The used detection technique employs a phase-crossing algorithm which identifies a zero optical path difference as the point where the phase difference between the red, green and blue parts of the white-light interference fringe becomes equal to zero. The optimized white-light source is designed to be a crucial part of an experimental setup for the surface diagnostics and automatic calibration of gauge blocks.

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Slightly dispersive white-light spectral interferometry to measure distances and displacements

Cited by 12 publications

References 17 publications

<title>Applications of dispersive white-light spectral interferometry in optics</title>

<title>Applications of dispersive white-light spectral interferometry in optics</title>

Light source for low-coherence interferometry surface diagnostics

White-light fringe detection based on a novel light source and colour CCD camera

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