scholarly journals Backscatter calibration of high-frequency multibeam echosounder using a reference single-beam system, on natural seafloor

2018 ◽  
Vol 39 (1-2) ◽  
pp. 55-73 ◽  
Author(s):  
Dimitrios Eleftherakis ◽  
Laurent Berger ◽  
Naig Le Bouffant ◽  
Anne Pacault ◽  
Jean-Marie Augustin ◽  
...  
Keyword(s):  
High Frequency ◽  
Multibeam Echosounder ◽  
Single Beam ◽  
Beam System

scholarly journals Characterization of an imaging multimode optical fiber using a digital micro-mirror device based single-beam system

2018 ◽  
Vol 26 (14) ◽  
pp. 18436 ◽  
Author(s):  
Liang Deng ◽  
Joseph D. Yan ◽  
Daniel S. Elson ◽  
Lei Su
Keyword(s):  
Optical Fiber ◽  
Multimode Optical Fiber ◽  
Single Beam ◽  
Beam System

scholarly journals High‐frequency multibeam echosounder classification for rapid environmental assessment

2008 ◽  
Vol 123 (5) ◽  
pp. 3622-3622 ◽  
Author(s):  
Kerstin Siemes ◽  
Mirjam Snellen ◽  
Dick G. Simons ◽  
Jean‐Pierre Hermand ◽  
Matthias Meyer ◽  
...  
Keyword(s):  
Environmental Assessment ◽  
High Frequency ◽  
Multibeam Echosounder

Analysis for lead in undiluted whole blood by tantalum ribbon atomic absorption spectrophotometry.

1978 ◽  
Vol 24 (7) ◽  
pp. 1182-1185 ◽  
Author(s):  
B L Therrell ◽  
J M Drosche ◽  
T W Dziuk
Keyword(s):  
Sample Preparation ◽  
Atomic Absorption ◽  
Whole Blood ◽  
Extended Period ◽  
Atomic Absorption Spectrophotometry ◽  
Single Beam ◽  
Absorption Spectrophotometry ◽  
Primary Screening ◽  
Beam System ◽  
No Sample Preparation

Abstract We describe a modified tantalum ribbon atomic absorption procedure for determining lead in undiluted whole blood. An instrumentation Laboratory (I.L.) Model 151 atomic absorption spectrophotometer equipped with an I.L. Model 355 Flameless Sampler was used. The Flameless Sampler was slightly modified to include three-cycle operation instead of the normal two cycles. This modified single-beam system, equipped with background correction, allows 5-microliter specimens of whole blood to be quickly and accurately analyzed. No sample preparation other than vortex mixing is involved and method reliability has been demonstrated during an extended period of successful participation in proficiency testing studies conducted by the Center for Disease Control. This tantalum ribbon methodology has further been demonstrated to be effective both as a primary screening procedure and as a confirmatory procedure, when coupled with erythrocyte protoporphyrin determinations, in screening over 300 000 clients during a three-year period of use in the Early and Periodic Screening, Diagnosis and Treatment (EPSDT) Program in Texas.

scholarly journals Dynamic Analysis of Vehicle Track Coupling Based on Double Beam Track Model

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yayun Qi ◽  
Huanyun Dai ◽  
Jianjin Yang ◽  
Kun Xu
Keyword(s):  
Frequency Band ◽  
High Frequency ◽  
Harmonic Excitation ◽  
Vertical Acceleration ◽  
Beam Model ◽  
Vertical Force ◽  
Nonlinear Method ◽  
Single Beam ◽  
Double Beam ◽  
Random Irregularity

The rail was considered as double Timoshenko beam in this paper, applied to the vehicle track coupling dynamics model; the Hertz nonlinear method is used to calculate the wheel rail contact force. Wheel rail vertical force and response of vehicle are calculated by using the model under random irregularity and single harmonic excitation; at the same time, wheel rail force and vertical acceleration response of 3-order, 10-order, and 19-order wheel polygon were calculated. The results show that, under the excitation of random irregularity, the wheel rail vertical force of two models was very close in the low frequency band, and the response of the double beam model in the high frequency band of 200–1000 Hz is larger than the single beam model, and the acceleration and displacement responses of the double beam model are relatively close. Under a single harmonic excitation, the double beam model has a shorter wheel rail force attenuation time than that of the single beam model. And wheel rail force peak value of double beam model is 9% larger than that of single beam model. Similarly, the vertical displacement of the double beam model increased by 2.6%. Under the 3-order and 10-order wheel polygon excitation, vertical wheel rail peak force of double beam is, respectively, 37.5% and 50% larger than single beam model; the vertical frame acceleration amplitude is 1 g and 1.7 g; under the 19-order polygon wheel excitation, the difference of the wheel rail force between two models is very small, and the amplitude of acceleration of bogie is 2.3 g. And double beam model has more advantage in analyzing high frequency problems such as wheel polygonization.

Demodulation algorithm used in single-beam system immune to light power drift

2015 ◽  
Vol 54 (8) ◽  
pp. 2032 ◽  
Author(s):  
Fupeng Wang ◽  
Jun Chang ◽  
Cunguang Zhu ◽  
Zongliang Wang ◽  
Yongning Liu ◽  
...  
Keyword(s):  
Light Power ◽  
Single Beam ◽  
Beam System

scholarly journals Review : Bathymetry Mapping Using Underwater Acoustic Technology

2019 ◽  
Vol 4 (2) ◽  
pp. 135
Author(s):  
Muhammad Zainuddin Lubis ◽  
Sri Pujiyati ◽  
Budhi Agung Prasetyo ◽  
Tiggi Choanji
Keyword(s):  
Real Time ◽  
High Accuracy ◽  
Parallel Patterns ◽  
Underwater Acoustic ◽  
Multibeam Echosounder ◽  
Single Beam ◽  
Accuracy And Precision ◽  
Multibeam Echosounder System ◽  
Bathymetric Map

The bathymetry mapping using underwater acoustic technology very important in Indonesia waters. Bathymetry is the result of measuring the height of the seabed so that the bathymetric map provides information about the seabed, where this information can provide benefits to several fields related to the seabed. In bathymetry mapping uses underwater acoustic technology where among them is using Single beam echosounder and MBES (Multibeam Echosounder System), and multibeam echosounder (MBES) is acoustic equipment that is intensively used frequently in basic waters mapping. The advantage of using underwater acoustic technology is the acquisition and processing of data in real time, high accuracy and precision (correction of the bathymetry data was carried out with reference to the 2008 International Hydrographic Organization (IHO), and cannot be a threat or damage to objects. Retrieval of bathymetry data must use parallel patterns, namely: patterns with perpendicular sounding directions and tend to be parallel to longitudinal lines or in accordance with parallel sounding patterns.

scholarly journals Development of High Frequency Acoustic Split-beam System for Zoo Plankton Measurement

2005 ◽  
Vol 32 (4) ◽  
pp. 247-253
Author(s):  
Masaki OGATA ◽  
Masahiko FURUSAWA ◽  
Bo-Kyu HWANG
Keyword(s):  
High Frequency ◽  
Beam System
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