Optical monitoring of polymerizations confined in microdroplets

2020 ◽  
Author(s):  
Veronica Krasecki ◽  
Andrew Cavell ◽  
Randall Goldsmith
Keyword(s):  
Optical Monitoring

Wide-field subsecond temporal resolution optical monitoring systems for detection and study of cosmic hazards

2013 ◽  
Vol 183 (8) ◽  
pp. 888-894
Author(s):  
G.M. Beskin ◽  
S.V. Karpov ◽  
V.L. Plokhotnichenko ◽  
S.F. Bondar ◽  
A.V. Perkov ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Monitoring Systems ◽  
Wide Field ◽  
Optical Monitoring

Discovery of the fast optical variability of GRB 080319B and the prospects for wide-field optical monitoring with high time resolution

2010 ◽  
Vol 180 (4) ◽  
pp. 424 ◽  
Author(s):  
G.M. Beskin ◽  
S.V. Karpov ◽  
S.F. Bondar ◽  
V.L. Plokhotnichenko ◽  
A. Guarnieri ◽  
...  
Keyword(s):  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Optical Variability ◽  
Wide Field ◽  
Optical Monitoring

scholarly journals Deciphering competitive routes for Ni‐based nanoparticle electrodeposition by an operando optical monitoring

2021 ◽  
Author(s):  
Louis Godeffroy ◽  
Paolo Ciocci ◽  
Anaclet Nsabimana ◽  
Mathias Miranda Vieira ◽  
Jean-Marc Noël ◽  
...  
Keyword(s):  
Optical Monitoring

scholarly journals Optical signatures of radiofrequency ablation in biological tissues

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pranav Lanka ◽  
Kalloor Joseph Francis ◽  
Hindrik Kruit ◽  
Andrea Farina ◽  
Rinaldo Cubeddu ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Treatment Time ◽  
Ex Vivo ◽  
Biological Tissues ◽  
Tissue Response ◽  
Optical Monitoring ◽  
Diffuse Optical Spectroscopy ◽  
Spectral Changes ◽  
Scattering Spectra ◽  
Optical Behavior

AbstractAccurate monitoring of treatment is crucial in minimally-invasive radiofrequency ablation in oncology and cardiovascular disease. We investigated alterations in optical properties of ex-vivo bovine tissues of the liver, heart, muscle, and brain, undergoing the treatment. Time-domain diffuse optical spectroscopy was used, which enabled us to disentangle and quantify absorption and reduced scattering spectra. In addition to the well-known global (1) decrease in absorption, and (2) increase in reduced scattering, we uncovered new features based on sensitive detection of spectral changes. These absorption spectrum features are: (3) emergence of a peak around 840 nm, (4) redshift of the 760 nm deoxyhemoglobin peak, and (5) blueshift of the 970 nm water peak. Treatment temperatures above 100 °C led to (6) increased absorption at shorter wavelengths, and (7) further decrease in reduced scattering. This optical behavior provides new insights into tissue response to thermal treatment and sets the stage for optical monitoring of radiofrequency ablation.

scholarly journals Deciphering competitive routes for Ni‐based nanoparticle electrodeposition by an operando optical monitoring

2021 ◽  
Author(s):  
Louis Godeffroy ◽  
Paolo Ciocci ◽  
Anaclet Nsabimana ◽  
Mathias Miranda Vieira ◽  
Jean-Marc Noël ◽  
...  
Keyword(s):  
Optical Monitoring

scholarly journals Flexible and Transparent Polymer-Based Optical Humidity Sensor

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3674
Author(s):  
Katerina Lazarova ◽  
Silvia Bozhilova ◽  
Sijka Ivanova ◽  
Darinka Christova ◽  
Tsvetanka Babeva
Keyword(s):  
Humidity Sensor ◽  
Amphiphilic Copolymer ◽  
Poly Vinyl Alcohol ◽  
Optical Monitoring ◽  
Optical Contrast ◽  
Successful Development ◽  
Flexible Sensor ◽  
Surface Profiling ◽  
Humidity Range ◽  
Different Levels

Thin spin-coated polymer films of amphiphilic copolymer obtained by partial acetalization of poly (vinyl alcohol) are used as humidity-sensitive media. They are deposited on polymer substrate (PET) in order to obtain a flexible humidity sensor. Pre-metallization of substrate is implemented for increasing the optical contrast of the sensor, thus improving the sensitivity. The morphology of the sensors is studied by surface profiling, while the transparency of the sensor is controlled by transmittance measurements. The sensing behavior is evaluated through monitoring of transmittance values at different levels of relative humidity gradually changing in the range 5–95% and the influence of up to 1000 bending deformations is estimated by determining the hysteresis and sensitivity of the flexible sensor after each set of deformations. The successful development of a flexible sensor for optical monitoring of humidity in a wide humidity range is demonstrated and discussed.

Multiplatform optical monitoring of eutrophication in temporally and spatially variable lakes

2003 ◽  
Vol 312 (1-3) ◽  
pp. 221-243 ◽  
Author(s):  
R.J Vos ◽  
J.H.M Hakvoort ◽  
R.W.J Jordans ◽  
B.W Ibelings
Keyword(s):  
Optical Monitoring

scholarly journals Optical monitoring of X-ray burst sources

1978 ◽  
Vol 184 (1) ◽  
pp. 27P-33P ◽  
Author(s):  
A. N. Abramenko ◽  
R. E. Gershberg ◽  
E. P. Pavlenko ◽  
V. V. Prokof'eva ◽  
W. H. G. Lewin ◽  
...  
Keyword(s):  
Optical Monitoring ◽  
X Ray

scholarly journals Optical monitoring of nonquarterwave layers of dielectric multilayer filters using optical admittance

2006 ◽  
Vol 14 (6) ◽  
pp. 2473 ◽  
Author(s):  
Byung Chun ◽  
Chang Kwon Hwangbo ◽  
Jong Sup Kim
Keyword(s):  
Optical Monitoring ◽  
Multilayer Filters ◽  
Dielectric Multilayer

scholarly journals Optical Monitoring of Microplastics Filtrated from Wastewater Sludge and Suspended in Ethanol

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 871
Author(s):  
Benjamin O. Asamoah ◽  
Pauliina Salmi ◽  
Jukka Räty ◽  
Kalle Ryymin ◽  
Julia Talvitie ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Optical Method ◽  
Specular Reflection ◽  
Speckle Pattern ◽  
Wastewater Sludge ◽  
Natural Environments ◽  
Optical Monitoring ◽  
Detection And Identification ◽  
Essential Parameter ◽  
Good Agreement

The abundance of microplastics (MPs) in the atmosphere, on land, and especially in water bodies is well acknowledged. In this study, we establish an optical method based on three different techniques, namely, specular reflection to probe the medium, transmission spectroscopy measurements for the detection and identification, and a speckle pattern for monitoring the sedimentation of MPs filtrated from wastewater sludge and suspended in ethanol. We used first Raman measurements to estimate the presence and types of different MPs in wastewater sludge samples. We also used microscopy to identify the shapes of the main MPs. This allowed us to create a teaching set of samples to be characterized with our optical method. With the developed method, we clearly show that MPs from common plastics, such as polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), and polyethylene (PE), are present in wastewater sludge and can be identified. Additionally, the results also indicate that the density of the plastics, which influences the sedimentation, is an essential parameter to consider in optical detection of microplastics in complex natural environments. All of the methods are in good agreement, thus validating the optics-based solution.

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