scholarly journals Influence of surface roughness on the light transmission through the boundaries of luminescent materials in radiation detectors-=SUP=-*-=/SUP=-

2021 ◽  
Vol 129 (9) ◽  
pp. 1182
Author(s):  
P. Liaparinos
Keyword(s):  
Surface Roughness ◽  
Optical Sensors ◽  
Optical Materials ◽  
Light Transmission ◽  
Imaging System ◽  
Radiation Detectors ◽  
Optical Signal ◽  
Transmission Factor ◽  
Luminescent Materials ◽  
Intermediate Surface

The optical transfer properties of an imaging system are affected by the performance of the discrete cascaded system stages that transfer efficiently the optical signal. Apart from the contribution of each component to the overall optical propagation, crucial role also plays the intermediate surface conditions. Surface roughness is characterized by irregularities with respect with the ideal smooth form. The degree of roughness has an influence on the surface behavior affecting correspondingly the overall enhancement of system's optical performance. In this manuscript, the angle dependent effect of surface roughness on phosphor . optical materials configuration is provided taking into account eight luminescent materials (CsI, Y3Al5O12, Y2O3, Bi4Ge3O12, CaWO4, ZnS, Lu2O3 and Gd2O2S) and three optical materials (InGaAs, ITO and SiO2). Results showed that higher transmission optical properties exhibited the: (i) CsI-InGaAs combination, (ii) ZnS-ITO and (iii) ZnS-SiO2 combination. The transmission factor was also quantitatively affected by increasing the surface roughness values and by decreasing the incident polar angles. Keywords: luminescent materials, optical sensors, surface roughness

scholarly journals The Surface-Roughness Effects on Light Beam Interactions between the CsI Phosphor and Optical Sensing Materials

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 174
Author(s):  
Panagiotis Liaparinos ◽  
Stratos David
Keyword(s):  
Surface Roughness ◽  
Indium Tin Oxide ◽  
Optical Sensing ◽  
Polar Angle ◽  
Intermediate Stage ◽  
Optical Signal ◽  
Transmission Factor ◽  
Roughness Effects ◽  
Phosphor Material ◽  
First Case

In digital phosphor-based imaging modalities, one important intermediate stage is the optical coupling between the phosphor material and the optical sensor. The performance of the optical compatibility is affected by surface-roughness issues, for which further research should be paid. This paper investigates the surface-roughness influence between the CsI phosphor material and the optical sensing materials (i.e., the silicon dioxide—SiO2, the indium tin oxide—ITO, and the indium gallium arsenide—InGaAs) employed in several image devices. Results showed that for all sensing materials, the transmission factor t of the optical signal follows qualitatively the variation of their refractive indexes and quantitatively the variation of the surface roughness and the incident polar angle. Finally, with respect to light wavelength, the curve of variation was found to be continuous for ITO and SiO2 sensing materials; however, lower and sharper variations were observed in the first case.

Modelling Light Transmission in a Fiber-Optical Reflection System

2004 ◽  
Vol 9 (1) ◽  
pp. 55-63
Author(s):  
V. Kleiza
Keyword(s):  
Optical Sensors ◽  
Light Transmission ◽  
External Cavity ◽  
Linear Displacement ◽  
Fiber System ◽  
Light Emitting ◽  
Optical Media ◽  
Reflected Light ◽  
Fiber Optical ◽  
Fiber Optical Sensors

Light transmission in the reflection fiber system, located in external optical media, has been investigated for application as sensors. The system was simulated by different models, including external cavity parameters such as the distance between light emitting and receiving fibers and mirror positioning distance. The sensitivity to a linear displacement of the sensors was studied as a function of the distance between the tips of the light emitting fiber and the center of the pair reflected light collecting fibers, by positioning a mirror. Physical fundamentals and operating principles of the advanced fiber optical sensors were revealed.

Determination of Hurst exponent by optical signal processing applied on surface roughness measurements

2009 ◽  
Author(s):  
José Antonio Marbán Salgado ◽  
Oscar Sarmiento Martínez ◽  
Darwin Mayorga Cruz ◽  
Jorge Uruchurtu Chavarín
Keyword(s):  
Surface Roughness ◽  
Signal Processing ◽  
Hurst Exponent ◽  
Optical Signal Processing ◽  
Optical Signal ◽  
Roughness Measurements

Host–guest luminescent materials based on highly emissive species loaded into versatile sol–gel hosts

2018 ◽  
Vol 47 (37) ◽  
pp. 12813-12826 ◽  
Author(s):  
Kassio P. S. Zanoni ◽  
Leandro P. Ravaro ◽  
Andrea S. S. de Camargo
Keyword(s):  
Optical Materials ◽  
Sol Gel ◽  
Luminescent Materials ◽  
New Host ◽  
Concise Review

By mostly focusing on the findings of our group, this concise review provides insights into the development of promising new host–guest optical materials based on sol–gel assemblies of versatile hosts and highly luminescent guests.

scholarly journals 4511 Bio-Compatible Implantable Oxygen Sensor Technology with Real-Time Monitoring of Surgical Flaps and Reimplantation

2020 ◽  
Vol 4 (s1) ◽  
pp. 93-93
Author(s):  
Preet Patel ◽  
Mohamed Ibrahim ◽  
Bruce Klitzman
Keyword(s):  
Oxygen Tension ◽  
Optical Sensors ◽  
Oxygen Sensor ◽  
Imaging System ◽  
Statistical Significance ◽  
Surgical Flaps ◽  
Tissue Oxygen Tension ◽  
Sensor Technology ◽  
Tissue Oxygen ◽  
Flap Viability

OBJECTIVES/GOALS: Current surgical flap and replantation monitoring techniques have limitations in detecting the pathologic state, calibration and cost-to-patient issues. Our hypothesis is that novel implantable oxygen sensors can provide a more efficient, accurate, and reliable monitoring of tissue oxygenation. METHODS/STUDY POPULATION: Experimental sensors were used with an exogenous remote used as a reader once implanted (Fig. 1) A rat tissue perfusion model with three regions of an SIEA flap as well as into adjacent control sites was made (Tip, Middle, and Base) Blood flow was greatest at the base, diminishing towards the Tip, thus creating a perfusion gradient. Changes in tissue oxygen tension PO2 were estimated by the steady-state fluorescence of the optical sensors using an IVIS imaging system. The sensors were used to collect data from days 0, 3, and 7 as a reading of Tissue Oxygen Tension (TOT) with ANOVA used to assess for statistical significance in blood oxygen data with respect to relative perfusion status. RESULTS/ANTICIPATED RESULTS: Inspired FiO2 was decreased from 100% to 12% with a corresponding change in the TOT readings from all sensors. (Fig. 2) The tip portion of the flap demonstrated the most profound detection of tissue necrosis, with the middle demonstrating the second most necrosis and the base demonstrating the least with correlating TOT sensor readings. (Fig. 3) Acute vascular compromise of the feeding blood vessels in the pedicle was immediately detected within 70 seconds (*p<0.05). (Fig. 4) DISCUSSION/SIGNIFICANCE OF IMPACT: This study introduces and validates a recent technique to monitor acute vascular occlusion, flap viability, and necrosis in the immediate postoperative period in a validated rodent model. Future directions of this novel technology will aim to reproduce these findings in clinical feasibility studies.

scholarly journals Effect of titanium surface roughness on human bone marrow cell proliferation and differentiation: an experimental study

2009 ◽  
Vol 24 (3) ◽  
pp. 200-205 ◽  
Author(s):  
Taís Somacal Novaes Silva ◽  
Denise Cantarelli Machado ◽  
Christian Viezzer ◽  
Aurelício Novaes Silva Júnior ◽  
Marília Gerhardt de Oliveira
Keyword(s):  
Bone Marrow ◽  
Surface Roughness ◽  
Cell Proliferation ◽  
Marrow Cell ◽  
Human Bone ◽  
Human Bone Marrow ◽  
Human Donor ◽  
Proliferation And Differentiation ◽  
Titanium Surfaces ◽  
Intermediate Surface

PURPOSE: To assess the proliferation and differentiation of human bone marrow-derived cells cultured on titanium surfaces with different roughness characteristics. METHODS: Cells obtained from the iliac crest of an adult human donor were routinely processed and cultured on titanium surfaces of varying roughness, according to their preparation method: polishing only (smooth surface) and polishing followed by etching with HF/HNO3 for 15 and 30 minutes (rough surfaces). Surfaces were assessed using scanning electronic microscopy and profilometry. RESULTS: Titanium disks etched with acid for 15 minutes allowed greater cell proliferation in all culture periods. The level of osteopontin and osteocalcin expression was increased in both acid-etched groups, which indicates an advanced stage of differentiation of cells into osteoblasts. CONCLUSIONS: Increased surface roughness accelerates the differentiation of undifferentiated mesenchymal cells into osteogenic lineage cells, but does not necessarily favor cell proliferation. An intermediate surface roughness of 0.5µm (acid etching for 15 minutes) favors both initial and final cell responses.

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