Free field measurements of the absorption coefficient for nonlocally reacting sound absorbing porous layers

2002 ◽  
Vol 112 (4) ◽  
pp. 1327-1334 ◽  
Author(s):  
G. Jansens ◽  
W. Lauriks ◽  
G. Vermeir ◽  
J. F. Allard
Keyword(s):  
Absorption Coefficient ◽  
Free Field ◽  
Field Measurements ◽  
Porous Layers

Comparison of three measurement techniques for the normal absorption coefficient of sound absorbing materials in the free field

2009 ◽  
Vol 126 (6) ◽  
pp. 3020-3027 ◽  
Author(s):  
Kunikazu Hirosawa ◽  
Kazuhiro Takashima ◽  
Hiroshi Nakagawa ◽  
Makoto Kon ◽  
Aki Yamamoto ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Measurement Techniques ◽  
Free Field ◽  
Absorbing Materials ◽  
Normal Absorption

Substructure methods for impact systems: Comparison with free field measurements

1994 ◽  
Vol 13 (2) ◽  
pp. 139-145
Author(s):  
Th. Neidhart ◽  
J. Grabe ◽  
G. Huber
Keyword(s):  
Free Field ◽  
Field Measurements

scholarly journals Evaluation of the CDOM Absorption Coefficient in the Arctic Seas Based on Sentinel-3 OLCI Data

2020 ◽  
Vol 12 (19) ◽  
pp. 3210
Author(s):  
Dmitry Glukhovets ◽  
Oleg Kopelevich ◽  
Anna Yushmanova ◽  
Svetlana Vazyulya ◽  
Sergey Sheberstov ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Atmospheric Correction ◽  
Field Measurements ◽  
Influential Factors ◽  
The Arctic ◽  
Arctic Seas ◽  
Color Sensors ◽  
Satellite Sensors ◽  
Processing Algorithms ◽  
Future Work

Our work’s primary goal is to reveal the problematic issues related to estimates of the colored organic matter absorption coefficient in the northern seas from data of the Ocean and Land Color Instrument (OLCI) installed on the Sentinel-3 satellites, e.g., a comparison of the OLCI standard error assessment ADG443_NN_err relating to the measurement and the retrieval of the geophysical products and the uncertainties in the northern seas’ real situation. The natural conditions are incredibly unfavorable there, mainly due to frequent cloudiness and low sun heights. We conducted a comprehensive multi-sensor study of the uncertainties using various approaches. We directly compared the data from satellites (OLCI Sentinel-3 and four other ocean color sensors) and field measurements in five sea expeditions (2016–2019) using the different processing algorithms. Our analysis has shown that the final product’s real uncertainties are significantly (≥100%) higher than the calculated errors of the ADG443_NN_err (~10%). The main reason is the unsatisfactory atmospheric correction. We present the analysis of the various influential factors (satellite sensors, processing algorithms, and other parameters) and formulate future work goals.

The Implementation of Time Selective Technique for Simulated Free-Field Measurements to Loudspeaker Characterization

2010 ◽  
Author(s):  
Fabio G. Ferraz ◽  
Marco Castro ◽  
Valdinei Sczibor ◽  
Juliano Medeiros ◽  
Leonardo Faria
Keyword(s):  
Free Field ◽  
Field Measurements ◽  
Selective Technique

Indirect in situ and free-field measurement of impedance model parameters or surface impedance of porous layers

1993 ◽  
Vol 39 (1-2) ◽  
pp. 77-117 ◽  
Author(s):  
Craig Hutchinson-Howorth ◽  
Keith Attenborough ◽  
Nicholas W. Heap
Keyword(s):  
Field Measurement ◽  
Surface Impedance ◽  
Free Field ◽  
Model Parameters ◽  
Impedance Model ◽  
Porous Layers
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