Optical analysis of a 3D-printed photoluminescent chip (Conference Presentation)

2020 ◽  
Author(s):  
Sangeetha Suresh Nair ◽  
Lisa Maria Batha ◽  
Andreas Heinrich
Keyword(s):  
Optical Analysis ◽  
3D Printed

scholarly journals Evaluation of Stereolithography-Based Additive Manufacturing Technology for BaTiO3 Ceramics at 465 nm

2022 ◽  
Vol 12 (1) ◽  
pp. 412
Author(s):  
Svyatoslav Chugunov ◽  
Andrey Smirnov ◽  
Anastasia Kholodkova ◽  
Andrey Tikhonov ◽  
Oleg Dubinin ◽  
...  
Keyword(s):  
3D Printing ◽  
Spectral Range ◽  
Spectral Shift ◽  
Spectral Change ◽  
Optical Analysis ◽  
3D Printers ◽  
3D Printed ◽  
Light Absorbance ◽  
Positive Effect ◽  
Powder Fraction

A piezoceramic BaTiO3 material that is difficult for 3D printing was tested with a homemade laser-based stereolithography (SLA) setup. The high light absorbance of BaTiO3 in the spectral range of 350–410 nm makes this material hardly usable with most commercial SLA 3D printers. The typical polymerization depth of BaTiO3 ceramic pastes in this spectral range hardly reaches 30–50 µm for 40 vol % powder loading. A spectral change to 465 nm was realized in this work via a robot-based experimental SLA setup to improve the 3D printing efficiency. The ceramic paste was prepared from a preconditioned commercial BaTiO3 powder and used for 3D printing. The paste’s polymerization was investigated with variation of powder fraction (10–55 vol %), speed of a laser beam (1–10 mm/s, at constant laser power), and a hatching spacing (100–1000 µm). The polymerization depths of over 100 µm were routinely reached with the 465 nm SLA for pastes having 55 vol % powder loading. The spectral shift from 350–410 nm spectral region to 465 nm reduced the light absorption by BaTiO3 and remedied the photopolymerization process, emphasizing the importance of comprehensive optical analysis of prospective powders in SLA technology. Two multi-layered objects were 3D-printed to demonstrate the positive effect of the spectral shift.

3D Printed Models for Surgical Planning and Reconstructive Implant Design in Sphenoorbital Tumor Surgery

2016 ◽  
Vol 77 (S 02) ◽  
Author(s):  
Hassan Othman ◽  
Sam Evans ◽  
Daniel Morris ◽  
Saty Bhatia ◽  
Caroline Hayhurst
Keyword(s):  
Surgical Planning ◽  
Implant Design ◽  
Tumor Surgery ◽  
3D Printed

That which Is Unseen: A 3D-Printed Case-Based Didactic Approach to Teaching Pediatric Cerebrovascular Neurosurgery

2019 ◽  
Author(s):  
Avital Perry ◽  
Soliman Oushy ◽  
Lucas Carlstrom ◽  
Christopher Graffeo ◽  
David Daniels ◽  
...  
Keyword(s):  
3D Printed ◽  
Approach To Teaching ◽  
Case Based

Optical analysis of ink and other contaminants in process waters

TAPPI Journal ◽  
2012 ◽  
Vol 11 (8) ◽  
pp. 51-58
Author(s):  
ANTTI HAAPALA ◽  
MIKA KÖRKKÖ ◽  
ELISA KOIVURANTA ◽  
JOUKO NIINIMÄKI
Keyword(s):  
Optically Active ◽  
Process Water ◽  
Paper Machine ◽  
Optical Analysis ◽  
Direct Process ◽  
Active Components ◽  
Water Contaminants ◽  
Dependent Measurement ◽  
Measurement Methodology

Analysis methods developed specifically to determine the presence of ink and other optically active components in paper machine white waters or other process effluents are not available. It is generally more interest¬ing to quantify the effect of circulation water contaminants on end products. This study compares optical techniques to quantify the dirt in process water by two methods for test media preparation and measurement: direct process water filtration on a membrane foil and low-grammage sheet formation. The results show that ink content values obtained from various analyses cannot be directly compared because of fundamental issues involving test media preparation and the varied methodologies used to formulate the results, which may be based on different sets of assumptions. The use of brightness, luminosity, and reflectance and the role of scattering measurements as a part of ink content analysis are discussed, along with fine materials retention and measurement media selection. The study concludes with practical tips for case-dependent measurement methodology selection.

In Vivo Optical Analysis of Quantitative Changes in Collagen and Elastin During Arterial Remodeling¶

2005 ◽  
Vol 81 (2) ◽  
pp. 457 ◽  
Author(s):  
Alexander Christov ◽  
Renee M. Korol ◽  
Erbin Dai ◽  
Liying Liu ◽  
Haiyan Guan ◽  
...  
Keyword(s):  
Arterial Remodeling ◽  
Optical Analysis ◽  
Quantitative Changes

Bioresorption and biodegradation of the 3D-printed gene-activated bone substitutes based on octacalcium phosphate

2020 ◽  
Vol XV (1) ◽  
Author(s):  
E. Presnyakov ◽  
I. Bozo ◽  
I. Smirnov ◽  
V. Komlev ◽  
V. Popov ◽  
...  
Keyword(s):  
Bone Substitutes ◽  
Octacalcium Phosphate ◽  
3D Printed

Aero-optical analysis of compressible flow over an open cavity

1987 ◽  
Author(s):  
PHILIP CASSADY ◽  
STANLEY BIRCH ◽  
P. TERRY
Keyword(s):  
Compressible Flow ◽  
Open Cavity ◽  
Optical Analysis
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