Description
The acoustic emission (AE) monitoring fixture is an add-on module to Floxlab passive and deviatoric triaxial cells. It is used to study fracture behavior during geotechnical experiments, e.g. hydraulic fracturing. Acoustic emissions testing provides a nondestructive and accurate characterization of the mechanical properties of samples under triaxial test conditions. Upon setting specific in-situ conditions, changes in loads, confining pressures, pore pressures and temperatures will ensue. These changes have the potential to produce ultrasonic events, which reveal useful AE parameters, including hit counts, energy, amplitude, event duration and AE hypocenter localization. The system comprises up to 8 AE transducers which are orientated radially at strategic positions around the specimen, AE signal processing system and 2 and 3 dimensional event location software.
Specifications
|
Peak sensitivity, Ref V/(m/s)
|
62 dB
|
|---|
|
Peak sensitivity, Ref V/µbar
|
-72 dB
|
|
Operating frequency
|
125-750 KHz
|
|---|
|
Resonant frequency, Ref V/(m/s)
|
140 kHz
|
|---|
|
Resonant frequency, Ref V/µbar
|
300 kHz
|
|---|
|
Directionality
|
+/-11.5 dB
|
|---|
|
Temperature range
|
-65 to 177°C
|
|---|
|
AE sensor Dimensions
|
0.3” OD x 0.3” H (8 mm OD x 8mm H)
|
|---|
Benefits
State of the art AE monitoring system
Excellently detects core failure onset during compression tests
Allows fracture morphology to be reconstructed during hydraulic fracture tests.