Acoustic velocity measurements in materials using a regenerative method

Patent · Wed Jan 01 00:00:00 EST 1986

OSTI ID:865747

Laine, Edwin F ^[1]

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1. Alamo, CA

Acoustic energy is propagated through earth material between an electro-acoustic generator and a receiver which converts the received acoustic energy into electrical signals. A closed loop is formed by a variable gain amplifier system connected between the receiver and the generator. The gain of the amplifier system is increased until sustained oscillations are produced in the closed loop. The frequency of the oscillations is measured as an indication of the acoustic propagation velocity through the earth material. The amplifier gain is measured as an indication of the acoustic attenuation through the earth materials. The method is also applicable to the non-destructive testing of structural materials, such as steel, aluminum and concrete.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4566084
• OSTI ID: 865747
• Country of Publication: United States
• Language: English

Related Subjects

acoustic
velocity
measurements
materials
regenerative
method
energy
propagated
earth
material
electro-acoustic
generator
receiver
converts
received
electrical
signals
closed
loop
formed
variable
amplifier
connected
increased
sustained
oscillations
produced
frequency
measured
indication
propagation
attenuation
applicable
non-destructive
testing
structural
steel
aluminum
concrete
structural material
closed loop
electrical signals
electrical signal
acoustic energy
structural materials
acoustic velocity
velocity measurements
acoustic propagation
non-destructive testing
velocity measurement
acoustic attenuation
/367/73/