Research on on-line calibration technology forone dimensional Laser Doppler Velocimeterbased on Strapdown Inertial NavigationSystem

2022 ◽  
Author(s):  
Chongbin Xi ◽  
Qi Wang ◽  
Xiaoming Nie ◽  
Rong Huang ◽  
Zhiyi Xiang ◽  
...  
Keyword(s):  
Laser Doppler ◽  
On Line

On-line meter calculating system of cable laser Doppler

2018 ◽  
Vol 47 (7) ◽  
pp. 706003
Author(s):  
白金成 Bai Jincheng ◽  
孙长库 Sun Changku ◽  
王 鹏 Wang Peng ◽  
耿 凯 Geng Kai ◽  
李洪全 Li Hongquan ◽  
...  
Keyword(s):  
Laser Doppler ◽  
On Line

Laser-Doppler flowmetry in monitoring regulation of rapid microcirculatory changes in spinal cord

1992 ◽  
Vol 263 (1) ◽  
pp. H285-H292
Author(s):  
P. J. Lindsberg ◽  
T. P. Jacobs ◽  
K. U. Frerichs ◽  
J. M. Hallenbeck ◽  
G. Z. Feuerstein
Keyword(s):  
Spinal Cord ◽  
Laser Doppler Flowmetry ◽  
Ischemia Reperfusion ◽  
Rabbit Model ◽  
Systemic Arterial Pressure ◽  
Laser Doppler ◽  
High Temporal Resolution ◽  
Doppler Flowmetry ◽  
Severe Hypotension ◽  
On Line

We established a rabbit model for continuous on-line monitoring of spinal cord microcirculation using laser-Doppler flowmetry (LDF). We tested the suitability of this model for studying rapid, nonequilibrium microcirculatory blood flow (BF) states induced by pharmacological treatments, hemorrhage, and asphyxia. Effective BF regulation was observed at systemic arterial pressure levels of 50 mmHg. Autoregulatory vasodilation began 1 min after the onset of severe hypotension, whereas more immediate vasodilation took place after asphyxia (hypercarbia). Pathological situations were studied in a simple model of spinal cord (SC) ischemia-reperfusion after 10 (n = 7) and 25 min (n = 7) of ischemia and 2 h of reperfusion. After 25 min of ischemia, delayed hypoperfusion (BF -35 +/- 7%, P less than 0.01) took place in association with tissue edema. LDF offered sensitive, stable, and reproducible estimates of microcirculation with high temporal resolution, thus permitting on-line evaluation of rapid, nonequilibrium BF responses and delayed states of spinal cord BF dysregulation.

Deposition of Thick Silicon Layers Using a Radio-Frequency Thermal Plasma

1998 ◽  
Author(s):  
D. Morvan ◽  
F. Krayem ◽  
S. Magnaval ◽  
S.F. Miralai ◽  
J. Amouroux ◽  
...  
Keyword(s):  
Laser Doppler Anemometry ◽  
Optical Emission ◽  
Deposition Process ◽  
Laser Doppler ◽  
Ex Situ ◽  
High Deposition Rate ◽  
Hydrogen Trapping ◽  
Mean Velocity ◽  
On Line ◽  
Silicon Particles

Abstract RF Ar-H2 plasma spraying of metallurgical grade silicon particles (80-125 µm) was used in order to combine the purification and the deposition process of silicon particles with a high deposition rate (300 - 600 µm). The hydrogen and oxygen content of the plasma gas turned out to be of a great importance to purify metallurgical silicon powders. The whole process was investigated through ex-situ characterisation of the deposits and on-line diagnostics of the plasma which results matched quite well with the mathematical modelling. The deposits were characterised using SEM, EDX analysis, SIMS, XPS in order to explain the composition and overall properties of the layers in view of their use in photovoltaic applications. Characterisation of silicon deposits was completed by the hydrogen rate analysis using exodiffusion method. Hydrogen trapping in plasma sprayed deposits was found in order of 1019 at/cm3. The oxygen contained in the original powders (30%) was decreased down to 3 - 5% in the deposits. Finally, the on-line diagnostics of the plasma used was : Laser Doppler Anemometry (LDA), Laser Doppler Granulometry (LDG) and Optical Emission Spectroscopy (OES). The mean velocity and surface temperature of particles was found to be in agreement with modelling results.

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