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Keywords = high index ball lenses

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19 pages, 13784 KB  
Article
Investigation on Modulation-Based Straightness Measurement
by Andrea Egidi, Alessandro Balsamo, Davide Corona and Marco Pisani
Sensors 2023, 23(6), 2912; https://doi.org/10.3390/s23062912 - 7 Mar 2023
Cited by 1 | Viewed by 2772
Abstract
The concept of a novel non-contacting technique for measuring straightness and its practical realization in a mechanical device are presented in this article. The device, called InPlanT, is based on the acquisition of the luminous signal retroreflected by a spherical glass target and [...] Read more.
The concept of a novel non-contacting technique for measuring straightness and its practical realization in a mechanical device are presented in this article. The device, called InPlanT, is based on the acquisition of the luminous signal retroreflected by a spherical glass target and impinged on a photodiode after mechanical modulation. The received signal is reduced to the sought straightness profile using dedicated software. The system was characterized with a high-accuracy CMM and the maximum error of indication was derived. Full article
(This article belongs to the Topic Manufacturing Metrology)
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21 pages, 11779 KB  
Article
High-Index Glass Ball Retroreflectors for Measuring Lateral Positions
by Andrea Egidi, Alessandro Balsamo and Marco Pisani
Sensors 2019, 19(5), 1082; https://doi.org/10.3390/s19051082 - 3 Mar 2019
Cited by 7 | Viewed by 4928
Abstract
This paper is concerned with backscattered luminous signals, coming from a particular class of dielectric spheres illuminated by a coherent source. The purpose is to measure the lateral position of the sphere serving as an optical target, to achieve an overall contactless sensor [...] Read more.
This paper is concerned with backscattered luminous signals, coming from a particular class of dielectric spheres illuminated by a coherent source. The purpose is to measure the lateral position of the sphere serving as an optical target, to achieve an overall contactless sensor of lateral position in space. Traditional approaches and theories such as ray-tracing and Mie scattering—as implemented in dedicated software—are applied to investigate their fitness for purpose in this application. No previous literature was found dealing with this specific case. Unfortunately, our observations did not match the theories’ predictions to an acceptable degree, and these approaches proved to be unsatisfactory. The rest of the paper focusses then on the development and comparison of suitable algorithms to compute the image coordinates of a representative point, which was in fact the true motivation of this work. Two original algorithms are proposed and discussed. Their robustness and repeatability are benchmarked under noisy conditions and at different distances from the target, with simulated as well as real images. Both resulted capable of sub-pixel accuracy. Full article
(This article belongs to the Special Issue Laser Sensors for Displacement, Distance and Position)
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15 pages, 11155 KB  
Article
An Optofluidic Lens Array Microchip for High Resolution Stereo Microscopy
by Mayurachat Ning Gulari, Anurag Tripathi, Mostafa Ghannad-Rezaie and Nikos Chronis
Micromachines 2014, 5(3), 607-621; https://doi.org/10.3390/mi5030607 - 28 Aug 2014
Cited by 11 | Viewed by 12300
Abstract
We report the development of an add-on, chip-based, optical module—termed the Microfluidic-based Oil-immersion Lenses (μOIL) chip—which transforms any stereo microscope into a high-resolution, large field of view imaging platform. The μOIL chip consists of an array of ball mini-lenses that are assembled onto [...] Read more.
We report the development of an add-on, chip-based, optical module—termed the Microfluidic-based Oil-immersion Lenses (μOIL) chip—which transforms any stereo microscope into a high-resolution, large field of view imaging platform. The μOIL chip consists of an array of ball mini-lenses that are assembled onto a microfluidic silicon chip. The mini-lenses are made out of high refractive index material (sapphire) and they are half immersed in oil. Those two key features enable submicron resolution and a maximum numerical aperture of ~1.2. The μOIL chip is reusable and easy to operate as it can be placed directly on top of any biological sample. It improves the resolution of a stereo microscope by an order of magnitude without compromising the field of view; therefore, we believe it could become a versatile tool for use in various research studies and clinical applications. Full article
(This article belongs to the Special Issue Microlenses)
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