Application Cases

Acoustic waves propagating through geomedia exhibit characteristics closely related to the physical and mechanical properties of the soil and rock. Understanding the acoustic properties of saline artificially frozen soil in artificial ground freezing engineering, and establishing the relationship between acoustic parameters and the physical-mechanical properties of saline artificially frozen soil, can provide a necessary basis for acoustic detection of anomalies in brine-infiltrated frozen walls. Current research on saline frozen soil can be divided into two aspects: physical properties and mechanical properties. Research on physical properties primarily focuses on the effects of salt content on the freezing temperature, liquid-plastic limit, unfrozen water content, and thermal conductivity of frozen soil. Research on mechanical properties mainly investigates the influence of water content, salt content, salt type, and temperature on the strength and deformation characteristics of saline frozen soil. Studies on acoustic wave propagation characteristics in frozen soil predominantly concentrate on two aspects: wave velocity characteristics and attenuation characteristics.

The Aigtek ATA-2000 Series High-Voltage Amplifier can drive piezoelectric ceramics to generate ultrasonic waves, enabling the setup of test platforms. Its ability to output stable arbitrary waveforms makes it adaptable for piezoelectric ceramic driving experiments in a wider range of application scenarios.

Experimental Name: Study on the Physical-Mechanical Properties and Acoustic Parameters of Saturated Saline Artificially Frozen Silt

Experimental Principle: Piezoelectric ceramics vibrate due to the inverse piezoelectric effect after applying a voltage. By changing the frequency of the AC signal, sound waves of various frequencies can be generated. Using calcium chloride-saturated silt as the research object, acoustic wave tests are conducted on saturated saline frozen silt under different pressures, salt contents, and temperature conditions. The acoustic parameters of the saline saturated frozen silt under high-stress conditions are analyzed, and methods to establish connections with unfrozen water content are explored.

Experimental Block Diagram:

Laboratory Setup Photo:

Experimental Process: First, a single-cycle sine wave is generated by the function generator. The excitation signal is then amplified by a piezoelectric linear amplifier and split into two paths. One path is directly output to the digital oscilloscope as the excitation waveform signal. The other path is used to drive the piezoelectric ceramic transmitter to generate vibrations and excite acoustic waves. These waves propagate through the test specimen. On the other end, the signal received by the piezoelectric ceramic receiver is filtered by the charge amplifier, amplified again, and transmitted to the digital oscilloscope as the received waveform signal. Finally, the oscilloscope's storage function is used to import the waveform data into a computer for determination of the propagation time.

Application Fields:

• Geological Engineering

• Environmental Engineering

• Civil Engineering

Application Scenarios:

• Frozen Soil Tunnels

• Underground Storage

• Soil Improvement

Product Recommendation: ATA-2000 Series High-Voltage Amplifier

Figure: ATA-2000 Series High-Voltage Amplifier Specifications and Parameters

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