Development of a realistic wave propagation-based chromatic confocal microscopy model

Claus, Daniel; Pedrini, Giancarlo; Boettcher, T.; Taphanel, Miro; Hibst, Raimund

doi:10.1117/12.2314914

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…However, wave aberrations, as discussed in Ref. 29, result in an asymmetric signal, which becomes more difficult to interpret and, with increasing width of the confocal signal, the measurement uncertainty is likewise increased. Moreover, a narrow confocal signal results in an increased intensity of the signal compared to a wider envelope and hence a stronger difference of intensity between consecutive pixels on the detector.…”

Section: Optomechanical Designmentioning

confidence: 99%

Development and verification of a snapshot dental intraoral three-dimensional scanner based on chromatic confocal imaging

et al. 2019

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We describe the development and verification of an optical, powder-free, intraoral scanner based on a chromatic confocal imaging system, which has been realized in a single-shot multifocal approach. The system is based on a combination of micro-optical and dispersion optical elements. The methodology of recording and analyzing the acquired data are discussed in detail. A proof of concept with the application in intraoral scanning is provided. According to the current findings, the measurement uncertainty, scan speed, and overall performance of the device can well compete with the state-of-the-art of commercially available intraoral scanners.

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Section: Optomechanical Designmentioning

confidence: 99%

Development and verification of a snapshot dental intraoral three-dimensional scanner based on chromatic confocal imaging

et al. 2019

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“…In chromatic confocal imaging the speckle contrast is furthermore increased due to the increased temporal coherence of the recorded light in comparison to conventional confocal imaging when using the same broad band light source. A brief discussion of the speckle effect using a wave-optical approach solely based on simulated data was presented by the authors in [11]. Despite the missing experimental confirmation of the modell, neither the effect of a tilted object nor the resulting change in axial position was addressed in [11].…”

Section: Introductionmentioning

confidence: 99%

“…A brief discussion of the speckle effect using a wave-optical approach solely based on simulated data was presented by the authors in [11]. Despite the missing experimental confirmation of the modell, neither the effect of a tilted object nor the resulting change in axial position was addressed in [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of aberrations and roughness on the chromatic confocal signal based on experiments and wave-optical modeling

Claus

Nizami

2020

Surf. Topogr.: Metrol. Prop.

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This paper addresses the effect and influence of wave optical aberrations and surface roughness on the chromatic confocal signal and resulting measurement errors. Two possible approaches exist for implementing chromatic confocal imaging based on either refraction or diffraction. Both concepts are compared and an expression for the expected chromatic longitudinal aberrations when using a diffractive optical element is derived. Since most chromatic confocal sensors are point sensors, the discussion on wave-optical aberrations is focused on spherical aberrations. Against common belief, the effect of spherical aberrations cannot be eliminated in the calibration process using for instance a piezo mounted mirror. It will be shown in the following that even a diffraction limited system with peak to valley spherical aberration smaller than 0.25 wavelength suffers from measurement errors. Experimental results will be shown to highlight this important issue. In order to develop a deeper understanding of the underlying physics, a wave-optical simulation environment has been realized. This wave-optical model furthermore enables the investigation of the influence of roughness. Herethereto the correct choice of numerical aperture when investigating a rough surface is based on a heuristic approach. Using the wave-optical simulations an explanation for the increased noise when employing a low numerical aperture to examine rough surfaces will be derived. Furthermore, a formula is presented to support the selection of the correct numerical aperture with regards to the roughness parameters of the surface under investigation.

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Signal evaluation in chromatic confocal spectral interferometry via k-space phase equality approach

Claus¹,

Boettcher

Ding

et al. 2019

Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXVI

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Development of a realistic wave propagation-based chromatic confocal microscopy model

Cited by 4 publications

References 3 publications

Development and verification of a snapshot dental intraoral three-dimensional scanner based on chromatic confocal imaging

Development and verification of a snapshot dental intraoral three-dimensional scanner based on chromatic confocal imaging

Influence of aberrations and roughness on the chromatic confocal signal based on experiments and wave-optical modeling

Signal evaluation in chromatic confocal spectral interferometry via k-space phase equality approach

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