New production method of convex microlens arrays for integrated fluorescence microfluidic detection systems

Yang, Hsiharng; Shyu, Ruey Fang; Huang, Jiaguo

doi:10.1007/s00542-006-0121-3

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…In the process of edge contour extraction, the extracted edge contours must be able to accurately describe the geometric shape of the fragments. In two-dimensional images, contour edge extraction methods include Grid Partitioning (Yang F.T., 2020), Depth Image (Dong Q.Q., 2023), Gaussian Mapping Clustering (Su Y.L., 2019), and so on. For 3D point clouds, the density of the point cloud distribution around the sampling points can be used to determine whether they are edge points.…”

Section: Fragment Feature Contour Lines Extractionmentioning

confidence: 99%

Research Progress in the Splicing and Restoration of Artifact Fragments Based on Point Cloud

Zhao,

Yin,

Yang

et al. 2023

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. Due to environmental reasons, most of the artifacts are fragmented, and the surface information of the artifacts is also blurred. The traditional method of repairing artifacts mainly relies on archaeologists to manually repair them, using fragment features to compare each fragment one by one, this method will cause secondary damage to the fragments. Based on computer technology, virtual restoration of artifacts fragments can obtain the latest unearthed data of artifacts quickly, preserve digital information of artifacts, achieve permanent preservation, and provide prior knowledge for subsequent artifacts restoration. Point cloud data is widely used in artifacts virtual restoration technology due to its good depth of information. This paper takes ceramics, bronzes, Terra-cotta Warriors, and other individual artifacts fragments as the main research object, and the point cloud data obtained by 3D laser scanner as the main research data. It comprehensively classifies and summarizes the work of computer artifacts splicing in recent years.

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Section: Fragment Feature Contour Lines Extractionmentioning

confidence: 99%

Research Progress in the Splicing and Restoration of Artifact Fragments Based on Point Cloud

Zhao,

Yin,

Yang

et al. 2023

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Free surface shaping to generate lenses is described for example in [7] and [9]. Polydimethylsiloxane (PDMS) is used for generation of moulding forms [1,3,10] or as material for lenses [1,4,11]. Adhesives and especially UVcuring adhesives are widely used for fabrication or replication of optical elements [5]- [7], [9]- [12].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of adhesive lenses using free surface shaping

Hoheisel¹,

Kelb²,

Wall³

et al. 2013

J. Eur. Opt. Soc.-Rapid Publ.

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Two approaches for fabricating polymer lenses are presented in this paper. Both are based on filling circular holes with UV curing adhesives. Initially, the viscous adhesive material creates a liquid and spherical free surface due to its own surface tension. This shape is then preserved by curing with UV-hardening light. For the first approach, the holes are generated in a 4 inch Si-wafer by deep reactive ion etching (DRIE) and for the second, a polydimethylsiloxane (PDMS) mould is manufactured. Three types of UV-curing adhesives are investigated (NOA 61, NOA 88 and NEA 121 by Norland Products). Preliminary to the determination of the lens curvature, a contact angle goniometer is used for taking side view images of the lenses. The radius of curvature is then extracted via image processing with the software MATLAB®. Furthermore, the surface roughness of the PDMS mould and the generated lenses is measured with a white light interferometer to characterize the casting process. The resolution power of the generated lenses is evaluated by measurement of their point spread functions (psf) and modulation transfer functions (mtf), respectively.

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A promising thermal pressing used in fabricating microlens array

Shyu

Yang

2006

Int J Adv Manuf Technol

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This paper describes a simple and inexpensive technique for designing and fabricating polygon microlens arrays using a thermal pressing process. Polygon microlens array molds were fabricated using lithography and an electroforming process. The microlens patterns were designed on a photomask and transferred to a substrate through photoresist patterning. Electroforming technology was used to convert the photoresist microlens patterns into metallic molds. A hot pressing machine was then used to produce the microlens array in a polycarbonate (PC) substrate. The experimental variables were compression pressure, temperature, and the pressing time. The surface roughness of the produced microlens array was measured using atomic force microscopy (AFM). The average microlens radii of curvature ranged from 315 to 420 mu m and the average sag heights were from 2.98 to 4.03 mu m, respectively. The experimental result showed that this fabrication process is useful for microlens array production

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New production method of convex microlens arrays for integrated fluorescence microfluidic detection systems

Cited by 3 publications

References 12 publications

Research Progress in the Splicing and Restoration of Artifact Fragments Based on Point Cloud

Research Progress in the Splicing and Restoration of Artifact Fragments Based on Point Cloud

Fabrication of adhesive lenses using free surface shaping

A promising thermal pressing used in fabricating microlens array

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