Towards the automatization of the Foucault knife-edge quantitative test

Rodríguez, Gabriel; Hernández, José de Jesús Villa; Martínez, Geminiano; Vargas, José Ismael De la Rosa; Ivanov, R.

doi:10.1117/12.2272323

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Cheng et al 6 used CCD and Fourier transform to process the knife-edge shadow gram and solved the surface wave-front error. In another study, Rodríguez et al [7][8][9] conducted in-depth research on the physical theory and gray level of the knife-edge method through physical optics to calculate the surface wave-front processing error data. The research on the knife-edge instrument reported above generally obtains a series of knife-edge shadow grams through the lateral movement of the knife-edge and then analyzes the shadow grams to obtain the mirror wave-front processing error.…”

Section: Introductionmentioning

confidence: 99%

Automatic Foucault test method based on transverse cutting at two different axial positions near the foci

2023

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.Foucault knife-edge method is an irreplaceable qualitative testing method in the early stage of optical processing, but it needs to accurately place the knife-edge at the focus of the mirror surface to be measured for testing. In view of the complex and difficult calibration process of the knife-edge instrument and the inability to perform quantitative testing efficiently, here the Foucault knife-edge testing method is improved by digitizing and automating it. The knife-edge instrument is first placed on the motorized precision translation stage for two programmed cutting movement perpendicular to the optical axis with controlled axial spacing. And the normal vector of each point on the mirror surface to be measured is solved through the knife-edge transverse position relationship for the bright and dark transition of the corresponding point on a series of knife-edge shadow grams obtained by two cuts. Then the automation and quantification of knife-edge method can be realized. The experimental results of this method are compared with the interferometer testing results, which have good consistency and high accuracy. This method does not require high calibration accuracy for the knife-edge instrument and can perform rapid and efficient testing. It provides a testing method with good performance for automatic and quantitative testing in the early stage of optical processing.

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Section: Introductionmentioning

confidence: 99%

Automatic Foucault test method based on transverse cutting at two different axial positions near the foci

2023

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“…The Foucault knife-edge test uses a knife edge to block out one part of the rays and analyzes the shadow that appears over the aberrated region. Although some algorithms have been proposed for quantitative measurement, the Foucault knife-edge test is still mainly used for qualitative analysis [1][2][3]. The Ronchi test measures the aberrations of imaging lenses with the interference patterns produced by a grating.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with traditional methods [1][2][3][4][5][6][7][8][9][10], WAMD is more flexible and can achieve sub-wavelength-level accuracy. Although its accuracy cannot achieve the same level as that of interferometry test, it can work in situations where the aberration is too large to be tested by an interferometer [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Wavefront Aberration Measurement Deflectometry for Imaging Lens Tests

Ruan

et al. 2022

Applied Sciences

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Lenses play an important role in imaging systems. Having an effective way to test the aberrations of imaging lenses is important. However, the existing methods cannot satisfy the requirements in some conditions. To overcome these difficulties, wavefront aberration measurement deflectometry (WAMD) is proposed in this paper, which can reconstruct the wavefront aberrations of imaging lenses by measuring the angular aberrations. The principle of WAMD is analyzed in detail, and the correctness and feasibility of the proposed method are verified by both a simulation and an experiment. A telephoto lens and a single imaging lens were tested in an experiment, and the RMS errors were 166.8 nm (5.71%) () and 58.9nm (4.74%) (), respectively, as compared with the interferometer’s results. This method is widely applicable with relatively reasonable accuracy. It has potential to be applied in the lens manufacturing and alignment process.

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