Metrological characterization of different methods for recovering the optically sectioned image by means of structured light

Martinez, Pol; Bermudez, Carlos; Carles, Guillem; Cadevall, Cristina; Matilla, Aitor; Marine, Joseph E.; Artigas, Roger

doi:10.1117/12.2592371

Cited by 7 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OSAM was designed to obtain optical sectioning through a confocal technique called 'Hi-Lo' [12,13]. In contrast to traditional confocal microscopy, implemented, for example, with a spatial light modulator [14,15], Hi-Lo does not require specialised equipment, which reduces the engineering complexity and cost of the instrument.…”

Section: Optical Designmentioning

confidence: 99%

Optical system for the measurement of the surface topography of additively manufactured parts

Vilar¹,

Artigas²,

Bermudez³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

Additive manufacturing (AM) is now regularly used for customised fabrication of parts with complex shapes and geometries. However, the large range of relevant scales, high slopes, step-like transitions, undercuts, alternation between dark and overly bright regions and other complex features present on the surfaces, in particular of metal additive parts, represent a significant challenge for current optical measurement technologies. Measuring surfaces with such complex features requires high numerical aperture (NA) optics, and state-of-the-art systems commonly include optics that can only reliably acquire surface topographies over a small field of view (FOV), typically tens or hundreds of micrometers. Such measurements are often insufficient for practical applications. Here, we present an optical system that features a large NA ( > 0.3) and a wide FOV 2.9 × 2.9 mm, capable of measuring AM parts in a single measurement, without the need for lateral stitching to increase the FOV. The proposed system exhibits optical properties that provide facility for large-field, high-resolution measurement of industrially-produced additively manufactured parts.

show abstract

Section: Optical Designmentioning

confidence: 99%

Optical system for the measurement of the surface topography of additively manufactured parts

Vilar¹,

Artigas²,

Bermudez³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…These characteristics enable our system to effectively capture the scales of interest and reduce measurement artifacts. The system was designed to implement the confocal-like HiLo technique 6,7 , which provides a cost effective solution with reduced complexity.…”

Section: Introductionmentioning

confidence: 99%

Robust measurement of surface topography for additive manufacturing using imaging confocal microscopy

Vilar¹,

Artigas²,

Duocastella³

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

View full text Add to dashboard Cite

Additive manufacturing (AM) has brought a new level of innovation to the production of metal parts, allowing for greater design freedom and on-demand fabrication capabilities. However, the measurement of the resulting surface texture has increased difficulties. Whilst optical techniques provide fast measurements, the high surface irregularities, the large range of scales of the features, and the high variations in surface reflectivity largely compromise performance. In practice, conventional systems have an insufficient field-of-view (FOV) or produce an excessive amount of measurement artifacts. We present an optical system optimized to measure AM parts, featuring a sufficiently wide field-of-view to capture the surface scales of interest, and a high numerical aperture (NA). We integrated a commercially available objective (SHR Plan Apo 2×, Nikon) with a custom-designed tube lens in a measuring head, achieving a magnification of 4.2× and an effective NA of 0.26. The system implements the confocal-like HiLo technique, and we experimentally demonstrate successful characterisation of metal AM parts. Furthermore, we report and discuss the design of a 6×/0.45 NA microscope objective, with great promise for increased performance. Additionally, we explore high dynamic range (HDR) approaches to tackle the issue of the high reflectivity variation. Multiple low dynamic range images taken at a range of illumination intensities are combined to reconstruct a single topography map. In all, the combination of the optical system, capable of capturing a large scale of spatial features, with the HDR capability offers a versatile solution that can be used in a variety of scientific and industrial contexts.

show abstract

Sparse domain robust denoising method in optically-sectioned structured illumination microscopy for complex surface measurement

Chai,

Chen,

et al. 2024

Optics and Lasers in Engineering

View full text Add to dashboard Cite

Metrological characterization of different methods for recovering the optically sectioned image by means of structured light

Cited by 7 publications

References 7 publications

Optical system for the measurement of the surface topography of additively manufactured parts

Optical system for the measurement of the surface topography of additively manufactured parts

Robust measurement of surface topography for additive manufacturing using imaging confocal microscopy

Sparse domain robust denoising method in optically-sectioned structured illumination microscopy for complex surface measurement

Contact Info

Product

Resources

About