Application Cases

With the rapid development of technology, the use of metal materials is widespread across various industries. Non-destructive testing of metal materials has always been a focal point in the field of materials.

Traditional piezoelectric ultrasonic guided wave sensors require the removal of the pipe coating to be in complete contact with the pipe. Ultrasonic waves are generated through the vibration of piezoelectric materials for detection, which makes the testing process relatively cumbersome. The new type of magnetostrictive ultrasonic guided wave sensor is a non-contact sensor. Ultrasonic waves are generated by the magnetostrictive strain caused by the change in the external dimensions of ferromagnetic materials under the action of an external magnetic field, resulting in stress waves within the ferromagnetic material. This type of sensor has high flexibility and adaptability and can address the disadvantages of traditional methods, such as low efficiency and high cost.

The ATA-2000 series amplifiers from Aigtek Electronics are widely used in the field of magnetostrictive non-destructive testing. With a maximum output voltage of 1600Vpp and a -3dB bandwidth of DC to 1MHz, they can drive most magnetostrictive ultrasonic transducers.

Experiment Title: Detection of Hole and Crack Damage Using Magnetostrictive Electromagnetic Ultrasonic Guided Waves

Experiment Principle:A pulsed voltage is applied across the transmitter transducer using a power amplifier to generate an alternating magnetic field. Based on the principle of magnetostriction, ferromagnetic materials expand and contract repeatedly under the action of the alternating magnetic field, creating vibrations that produce ultrasonic waves. These ultrasonic waves are used to detect the presence of defects in ferromagnetic materials.

Experiment Block Diagram:

Experiment System Real Photo:

Experiment Process:The signal generator outputs a sine wave-modulated excitation signal, which is amplified by the power amplifier to produce an output voltage of 180Vpp. This voltage excites the magnetostrictive transducer to emit ultrasonic signals. The ultrasonic signals propagate through the ferromagnetic material and are received by a piezoelectric sensor. The received signal is converted into a voltage signal and displayed on an oscilloscope. The presence of defects in the ferromagnetic material is determined by analyzing the received signal.

Experimental Results:After driving the electromagnetic ultrasonic transducer, there is a spatial separation between the excited transducer and the piezoelectric sensor. This results in a time interval between the transmitted wave peak and the echo wave peak, which can be clearly observed on the oscilloscope as distinct transmitted and received echoes.

Function of the Power Amplifier:The power amplifier is the core component of the entire experiment. In this experiment, it provides a 180V voltage signal to drive the electromagnetic ultrasonic transducer to generate ultrasonic waves.

Figure: Specifications of the ATA-2000 Series High Voltage Amplifier

Application Fields:Materials, Construction, Industrial Manufacturing

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