Concrete Rock Modulus Measurement System UMS-LF
summary
The UMS-LF-50 concrete rock elastic modulus measurement system uses ultrasonic non-destructive measurement method to characterize the non-destructive elastic modulus of high attenuation materials. Compared to the destructive compression test and impact resonance method of the testing machine, it has higher accuracy and does not damage the experimental object.
The measurement results include
Longitudinal and transverse wave velocities
Young's modulus, Poisson's ratio, shear modulus, and bulk modulus of elasticity
Sound attenuation coefficient
|
sample |
Number 1 |
No. 2 |
No. 3 |
No. 4 |
Number 5 |
Number 6 |
No. 7 |
No. 8 |
|
Young's modulus Gpa |
2.86 |
2.65 |
2.61 |
6.13 |
4.44 |
3.82 |
5.40 |
9.21 |
|
Poisson's ratio |
0.35 |
0.35 |
0.08 |
0.20 |
0.23 |
0.21 |
0.31 |
0.10 |
|
Attenuation coefficient dB/cm |
1.61 |
2.66 |
1.30 |
0.95 |
0.64 |
1.95 |
1.02 |
1.25 |
Example diagram of measurement results
The description of the UMS-LF-50 concrete rock elastic modulus measurement system mainly uses UT-AWG high-voltage broadband amplifier to amplify the waveform signal generated by any waveform generator to achieve high-voltage excitation, with a maximum amplification of 300 Vpp and a bandwidth ranging from DC to 5 MHz. The optional duplexer can achieve single probe echo measurement, and the optional Pre AMP can provide an additional 20/40/60dB preamplifier. We can also customize various low-frequency ultrasound transducers to meet customer needs. The function generator for generating incentive waveforms and the oscilloscope for displaying waveforms are provided by the user.
technical parameter
UT-AWG technologyParameters:
|
Output short circuit protection |
|
|
Number of channels |
1 |
|
Bandwidth (-3dB) |
DC-2 MHz，-6 dB@5MHz |
|
Maximum output voltage |
300 Vp-p |
|
Maximum output current |
300 mAp |
|
Voltage gain |
X50 |
|
Input/output impedance |
50Ω |
RDX-6 DuplexerTechnical parameters:
Figure2 –RDX-6 chart
In order to separate the excitation high voltage signal from the weak voltage signal from the probe, a duplexer is needed to isolate the high voltage amplifier and preamplifier. Bandwidth of 50KHz-40MHz, input and output impedance of 50 ohms.
|
Number of channels |
1 (Used for single probe echo method testing, separating high-voltage excitation signals from weak signals from the probe) |
|
Bandwidth (-3dB): Reception bandwidth |
250 KHz-45 MHz |
|
damping |
10/22/41/80/162/310/619/1300 ohms |
|
wave filtering |
30/275/750 KHz 1.6/3.4/7.5/16/34 MHz |
|
IN port |
Connect the high-voltage amplifier or ultrasonic transmitter port |
|
OUT port |
Connect the ultrasound probe |
|
To REC port |
Connect the preamplifier, oscilloscope/acquisition card or ultrasonic receiver port |
Meaning of Duplex Panel Switches and Knobs:
|
IN/OUT switch |
Noise suppression switch |
|
0 dB/1 dB switch |
Impedance modulation attenuator |
|
0 dB/2 dB switch |
Impedance modulation attenuator |
Low frequency filtering knob:
|
Position |
Inductance |
Approx. 3 dBpoint |
|
A |
Open |
30 kHz |
|
B |
27 μH |
275 kHz |
|
C |
10 μH |
750 kHz |
|
D |
4.7 μH |
1.6 MHz |
|
E |
2.2 μH |
3.4 MHz |
|
F |
1 μH |
7.5MHz |
|
G |
0.47 μH |
16 MHz |
|
H |
0.22μH |
34 MHz |
1-8 Damping adjustment knob:
Position ;Damping Resistor
|
1 |
1300 Ohms |
|
2 |
619 Ohms |
|
3 |
10 Ohms |
|
4 |
162 Ohms |
|
5 |
80 Ohms |
|
6 |
41 Ohms |
|
7 |
22 Ohms |
|
8 |
10 Ohms |
Pre AMP preamplifierParameters:
Figure3 –PRE-AMP chart
|
Magnification factor |
20/40/60 dB three levels |
|
Bandwidth (-3dB): Reception bandwidth |
4 KHz-4 MHz |
|
Input/output impedance |
39 KΩ/50 Ω |
|
power supply |
24 V |
Low frequency dry coupled ultrasound probeParameters:
Figure4 –Low frequency dry coupling probe diagram
|
Low frequency dry coupled longitudinal wave transducer |
100 KHz (bandwidth from 10 to 160 KHz) |
|
Low frequency dry coupled transverse wave transducer |
50 KHz (bandwidth from 10 to 100 KHz) |
|
Maximum excitation voltage |
400 Vpp |
Air coupled ultrasonic probeParameters:
Figure 5- Air Coupled Ultrasonic Probe Diagram
|
Air coupled ultrasonic transducer |
500 KHz non focusing (other parameters can be customized) |
|
Maximum excitation voltage |
600 Vpp |
Contact coupled ultrasound probeparameter
Figure 6- Contact Coupled Ultrasonic Probe Diagram
Piezoelectric ultrasonic transducer: 5 MHz non focused (other parameters can be customized)
Research Platform Construction Instructions
Figure 7- Circuit diagram for building the echo method platform
Figure 8- Circuit diagram for building the transmission method platform
Note:
Probe parameters need to be customized according to requirements
Please provide the oscilloscope and function generator by yourself
