Finite aperture correction for spectral cameras with integrated thin-film Fabry–Perot filters

Goossens, Thomas; Geelen, Bert; Lambrechts, Andy; Hoof, Chris Van

doi:10.1364/ao.57.007539

Cited by 26 publications

(21 citation statements)

References 15 publications

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“…The analysis can be simplified by decomposing the focused beam of light in contributions of equal angles of incidence. In earlier work we have shown that the effect of the aperture can be modeled by a convolution of the transmittance of the filter with a kernel K θ cone , θ CRA (λ) [6]. The kernel was defined as…”

Section: Finite Aperture Correctionmentioning

confidence: 99%

“…Second, in this equation, the symbol η is equal to γ as used in Eq. (15) in [6], where it was used for the case without vignetting. In this article, the symbol γ will be reserved for the more general case of vignetting.…”

Section: Finite Aperture Correctionmentioning

confidence: 99%

“…By taking the real part of the inverse cosine, the case in which there is a complete contributing circle within the aperture is also modeled (Fig. 4) [6]. This is because Re(arccos z) = π, for z ≤ −1.…”

Section: Focused Light From a Vignetted Aperturementioning

confidence: 99%

“…Focused light from a finite aperture widens and shifts the transmittance peak of thin-film Fabry-Pérot filters because these filters are angle-dependent [6]. This angle-dependent property causes undesired shifts in the measured spectra which limit the accuracy of the spectral imaging technology.…”

Section: Introductionmentioning

confidence: 99%

“…In previous work we proposed a model that was used to successfully correct the undesired shifts in measured spectra [6]. However, this model is only valid for a lens that shows no significant optical vignetting.…”

Section: Introductionmentioning

confidence: 99%

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Vignetted-aperture correction for spectral cameras with integrated thin-film Fabry–Perot filters

et al. 2019

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Spectral cameras with integrated thin-film Fabry-Pérot filters have become increasingly important in many applications. These applications often require the detection of spectral features at specific wavelengths or to quantify small variations in the spectrum. This can be challenging since thin-film filters are sensitive to the angle of incidence of the light. In prior work we modeled and corrected for the distribution of incident angles for an ideal finite aperture. Many real lenses however experience vignetting. Therefore in this article we generalize our model to the more common case of a vignetted aperture, which changes the distribution of incident angles. We propose a practical method to estimate the model parameters and correct undesired shifts in measured spectra. This is experimentally validated for a lens mounted on a visible to near-infrared spectral camera.

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Section: Finite Aperture Correctionmentioning

confidence: 99%

Section: Finite Aperture Correctionmentioning

confidence: 99%

Section: Focused Light From a Vignetted Aperturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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