Sound velocity measurement by ultrasonic and Brillouin scattering techniques in compounds with matlockite structure

1998 ◽  
Vol 30 (2) ◽  
pp. 235-240 ◽  
Author(s):  
Frédéric Decremps ◽  
Myriam Fischer ◽  
Alain Polian ◽  
Manuel Sieskind
Keyword(s):  
Sound Velocity ◽  
Velocity Measurement ◽  
Brillouin Scattering

Density and sound velocity measurement by an Anton Paar DSA 5000 density meter: Precision and long-time stability

2021 ◽  
Vol 329 ◽  
pp. 115547
Author(s):  
Zdeněk Wagner ◽  
Magdalena Bendová ◽  
Jan Rotrekl ◽  
Adéla Sýkorová ◽  
Maja Čanji ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Velocity Measurement ◽  
Time Stability ◽  
Long Time ◽  
Long Time Stability

Pressure calibration and sound velocity measurement to 12 GPa in multi-anvil apparatus

2021 ◽  
Author(s):  
Wei Song ◽  
Shuangming Shan ◽  
Qizhe Tang ◽  
Chang Su ◽  
Yonggang Liu
Keyword(s):  
Sound Velocity ◽  
Velocity Measurement ◽  
Pressure Calibration

scholarly journals Experimental evidence for silica-enriched Earth’s lower mantle with ferrous iron dominant bridgmanite

2020 ◽  
Vol 117 (45) ◽  
pp. 27899-27905
Author(s):  
Izumi Mashino ◽  
Motohiko Murakami ◽  
Nobuyoshi Miyajima ◽  
Sylvain Petitgirard
Keyword(s):  
Sound Velocity ◽  
Lower Mantle ◽  
Mantle Convection ◽  
Brillouin Scattering ◽  
Seismic Structure ◽  
The Earth ◽  
Diamond Anvil ◽  
Evolution Dynamics ◽  
Iron Bearing

Determination of the chemical composition of the Earth’s mantle is of prime importance to understand the evolution, dynamics, and origin of the Earth. However, there is a lack of experimental data on sound velocity of iron-bearing Bridgmanite (Brd) under relevant high-pressure conditions of the whole mantle, which prevents constraints on the mineralogical model of the lower mantle. To uncover these issues, we have conducted sound-velocity measurement of iron-bearing Brd in a diamond-anvil cell (DAC) up to 124 GPa using Brillouin scattering spectroscopy. Here we show that the sound velocities of iron-bearing Brd throughout the whole pressure range of lower mantle exhibit an apparent linear reduction with the iron content. Our data fit remarkably with the seismic structure throughout the lower mantle with Fe2+-enriched Brd, indicating that the greater part of the lower mantle could be occupied by Fe2+-enriched Brd. Our lower-mantle model shows a distinctive Si-enriched composition with Mg/Si of 1.14 relative to the upper mantle (Mg/Si = 1.25), which implies that the mantle convection has been inefficient enough to chemically homogenize the Earth’s whole mantle.

A Method of Seawater Sound Velocity Measurement Based on the Transit-Time

2013 ◽  
Vol 816-817 ◽  
pp. 439-442
Author(s):  
Bao Feng Zhang ◽  
Zhen Hai Liu ◽  
Xiao Ma
Keyword(s):  
Sound Velocity ◽  
Influencing Factors ◽  
High Precision ◽  
Transit Time ◽  
Precision Measurement ◽  
Propagation Velocity ◽  
Velocity Measurement ◽  
Velocity Variation ◽  
High Precision Measurement ◽  
Ultrasound Propagation

In the prospects of maritime development, the accuracy requirements of the marine sonar equipment also getting higher and higher, it is particularly important to measure the sound velocity in seawaters(ultrasound propagation velocity in seawater) in high-precision, in this experiment, basing on the seawater sound velocity variation influencing factors, proposing a method of average measuring the sound velocity of seawater based on STM32 and TDC-GP21 transit-time, The results of the experiment show that this method can be high-precision measurement of the size of the seawater sonic，meet the seawater sound velocity measurement requirements.

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