LED marine beam transmittance meter

1977 ◽  
Vol 48 (5) ◽  
pp. 528-530 ◽  
Author(s):  
L. Basano ◽  
P. Ottonello ◽  
L. Papa
Keyword(s):  
Beam Transmittance

Development of improved solar radiation models for predicting beam transmittance

Solar Energy ◽  
1990 ◽  
Vol 44 (3) ◽  
pp. 149-156 ◽  
Author(s):  
Sheldon M. Jeter ◽  
Constantinos A. Balaras
Keyword(s):  
Solar Radiation ◽  
Beam Transmittance

Estimation of solar direct beam transmittance of conifer canopies from airborne LiDAR

2013 ◽  
Vol 136 ◽  
pp. 402-415 ◽  
Author(s):  
Keith N. Musselman ◽  
Steven A. Margulis ◽  
Noah P. Molotch
Keyword(s):  
Airborne Lidar ◽  
Direct Beam ◽  
Beam Transmittance

scholarly journals Biodeterioration of Optical Glass Induced by Lubricants Used in Optical Instruments Technology

2010 ◽  
Vol 59 (4) ◽  
pp. 295-300 ◽  
Author(s):  
MAGDALENA BARTOSIK ◽  
ZOFIA ŻAKOWSKA ◽  
KRYSTYNA CEDZIŃSKA ◽  
KAZIMIERZ ROŻNIAKOWSKI
Keyword(s):  
Aspergillus Niger ◽  
Laser Light ◽  
Optical Glass ◽  
Glass Plate ◽  
Culture Fluid ◽  
Analysis Method ◽  
Optical Instruments ◽  
Surface Measurements ◽  
Auxiliary Material ◽  
Beam Transmittance

The process of biodeterioration of optical glass was studied after being induced by an auxiliary material (lubricant 4CKP) used in the production of optical instruments. It was determined that the lubricant can initiate growth of conidia of Aspergillus niger fungus. Acid spawn metabolites cause deterioration of the glass surface. Measurements of laser light beam transmittance through the glass plate and the AAS chemical analysis method of the post-culture fluid allowed to determine that glass with a high SiO2 content is most resistant to corrosion caused by the growth of A. niger fungi spawn.

scholarly journals Ship borne rotating shadow band radiometer observations for the determination of multi spectral irradiance components and direct sun products for aerosol

2016 ◽  
Author(s):  
Jonas Witthuhn ◽  
Hartwig Deneke ◽  
Andreas Macke ◽  
Germar Bernhard
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Precipitable Water ◽  
Gas Absorption ◽  
Spectral Irradiance ◽  
Total Uncertainty ◽  
Direct Beam ◽  
Sun Photometer ◽  
Beam Transmittance ◽  
Band Radiometer

Abstract. The 19 channel rotating shadow band radiometer GUVis-3511 built by Biospherical Instruments is introduced as an instrument which is able to provide automated ship borne measurements of the direct, diffuse and global spectral irradiance components without a requirement for stabilization. Several direct sun products, including spectral direct beam transmittance, aerosol optical depth, Angström exponent, and precipitable water can be derived from these observations. The individual steps of the data analysis are described, and the different sources of uncertainty are discussed. The total uncertainty of the observed direct beam transmittances is estimated to be 4.24 % at 95 % CI for ship borne operation. The calibration is identified as the dominating contribution to the total uncertainty. A comparison of direct beam transmittance with those obtained from a Cimel sun photometer at a land site and a manually operated Microtops II sun photometer on a ship is presented, yielding relative deviations of less than 3 % and 4 % on land and on ship, respectively, for most channels and in agreement with our previous uncertainty estimate. These numbers demonstrate that the instrument is well suited for ship borne operation, and the applied methods for motion correction work accurately. Based on spectral direct beam transmittance, aerosol optical depth at 510 nm can be retrieved with an uncertainty of 0.0032 for a 95 % CI. Only minor deviations occur due to the different methods used for estimating Rayleigh scattering and gas absorption optical depths, as implemented by AERONET and in our processing. Relying on the cross-calibration of the 940 nm water vapor channel with the Cimel sun photometer, the column amount of precipitable water has been estimated with an uncertainty of +−0.034 cm. More research is needed to estimate the accuracy of the instrument for low sun (solar zenith angles larger than 70°) and during periods with strong swell.

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