Bulk Absorption Measurements Using Prism-Shaped Samples for Laser Calorimetry

2008 ◽  
pp. 135-135-5
Author(s):  
PA Temple ◽  
DP Arndt
Keyword(s):  
Bulk Absorption ◽  
Absorption Measurements ◽  
Laser Calorimetry

Bulk absorption measurements of highly transparent DUV/VUV optical materials

2004 ◽  
Author(s):  
Christian Muhlig ◽  
Siegfried Kufert ◽  
Wolfgang Triebel ◽  
Frank Coriand ◽  
Lutz Parthier ◽  
...  
Keyword(s):  
Optical Materials ◽  
Bulk Absorption ◽  
Absorption Measurements

Fibre evanescent field absorption (FEFA): an optical fibre technique for measuring light absorption in turbid water samples

2004 ◽  
Vol 55 (5) ◽  
pp. 533 ◽  
Author(s):  
D. W. Lamb ◽  
Y. Bunganaen ◽  
J. Louis ◽  
G. A. Woolsey ◽  
R. Oliver ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Suspended Sediment ◽  
Optical Fibre ◽  
Simple Calculation ◽  
Sediment Concentration ◽  
Evanescent Field ◽  
Bulk Absorption ◽  
Glass Silica ◽  
Inland Rivers ◽  
Absorption Measurements

An optical fibre technique for measuring the absorption of water-borne pigment in the present of significant suspended sediment concentration has been evaluated. Based on the absorption of the evanescent field of light propagating down a single glass (silica) fibre, the fibre evanescent field absorption (FEFA) technique has been demonstrated to be approximately 10-fold less sensitive to absorbing species than traditional bulk absorption methods. However, unlike traditional optical absorption measurements, the FEFA technique is insensitive to scattering by the suspended particles for particle concentrations expected in typical inland waters. A simple calculation estimates that this insensitivity persists for sediment concentrations up to 2000-fold those expected in Australian inland rivers. In addition to experimental results, a discussion of the potential operational use of this technique in measuring optical absorption properties of water containing suspended sediment is presented.

Absorption measurements by laser calorimetry

1979 ◽  
Vol 50 (1) ◽  
pp. 102-110 ◽  
Author(s):  
Herbert B. Rosenstock
Keyword(s):  
Absorption Measurements ◽  
Laser Calorimetry

High-Bandwidth Laser-Absorption Measurements of Temperature, Pressure, CO, and H2O in the Annulus of a Rotating Detonation Rocket Engine

2021 ◽  
Author(s):  
Garrett C. Mathews ◽  
Matthew Blaisdell ◽  
Aaron I. Lemcherfi ◽  
Carson D. Slabaugh ◽  
Christopher S. Goldenstein
Keyword(s):  
Rocket Engine ◽  
Laser Absorption ◽  
High Bandwidth ◽  
Rotating Detonation ◽  
Absorption Measurements

scholarly journals Aggregation affects optical properties and photothermal heating of gold nanospheres

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yiru Wang ◽  
Zhe Gao ◽  
Zonghu Han ◽  
Yilin Liu ◽  
Huan Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Section ◽  
Laser Heating ◽  
Dipole Approximation ◽  
Gold Nanospheres ◽  
Extinction Cross Section ◽  
Heating Efficiency ◽  
Photothermal Heating ◽  
New Framework ◽  
Laser Calorimetry

AbstractLaser heating of gold nanospheres (GNS) is increasingly prevalent in biomedical applications due to tunable optical properties that determine heating efficiency. Although many geometric parameters (i.e. size, morphology) can affect optical properties of individual GNS and their heating, no specific studies of how GNS aggregation affects heating have been carried out. We posit here that aggregation, which can occur within some biological systems, will significantly impact the optical and therefore heating properties of GNS. To address this, we employed discrete dipole approximation (DDA) simulations, Ultraviolet–Visible spectroscopy (UV–Vis) and laser calorimetry on GNS primary particles with diameters (5, 16, 30 nm) and their aggregates that contain 2 to 30 GNS particles. DDA shows that aggregation can reduce the extinction cross-section on a per particle basis by 17–28%. Experimental measurement by UV–Vis and laser calorimetry on aggregates also show up to a 25% reduction in extinction coefficient and significantly lower heating (~ 10%) compared to dispersed GNS. In addition, comparison of select aggregates shows even larger extinction cross section drops in sparse vs. dense aggregates. This work shows that GNS aggregation can change optical properties and reduce heating and provides a new framework for exploring this effect during laser heating of nanomaterial solutions.

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