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Electromagnetic Lamb Wave Nondestructive Inspection Test--Application of Power Amplifier

发布:2021-04-16

The ultrasonic nondestructive testing system is composed of signal generator, power amplifier, excitation probe, metal plate, filter circuit, receiving probe and oscilloscope. The voltage signal excitation generated by the signal generator is amplified and then drives the actuator. At the same time, it needs to be used at the receiving end to collect dynamic data.

The basic principle of ultrasonic Lamb wave flaw detection:

The electromagnetic ultrasonic Lamb wave is based on the principle of electromagnetic induction for defect detection. The permanent magnet and AC coil of the ultrasonic transducer generate a bias magnetic field to form Lorentz force in the metal plate, generate mechanical vibration, and form ultrasonic waves that penetrate the thickness of the plate. Receiving is an inverse process of excitation. The receiving coil induces electromotive force when the particle vibrates and cuts the magnetic induction line. If there is a defect, the signal echo will change. Therefore, judgment and positioning can be made by the change of the received signal.

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The principle of ultrasonic Lamb wave excitation:

The current-carrying coil of the electromagnetic ultrasonic lamb wave transducer has two forms: a folding coil and a spiral coil. When a high-frequency alternating current is passed into the coil and the horizontal or vertical static magnetic field is prevented, the underside of the transducer is High-frequency vibration will be generated on the surface of the metal plate. When the thickness of the metal plate is less than or equal to one-half of the wavelength, the high-frequency vibration will propagate out in the form of Lamb waves.

Ultrasonic non-destructive testing system diagram:

About the introduction of the power amplifier in the ultrasonic Lamb wave flaw detection test:

Aigtek power amplifiers can be equipped with signal generators of any brand and model, which can quickly meet test requirements to build an experimental test platform, and can flexibly control output voltage and power. It has a complete output protection circuit (output overcurrent, overvoltage protection), ATA2022H The voltage gain of the high-voltage power amplifier is adjustable from 0 to 60 times by numerical control, which can be divided into two types: coarse adjustment (1step) and fine adjustment (0.1 step). Combined with the display of the gain of the LCD panel, it can be quickly adjusted to the required voltage value. 1/100 Monitor: The voltage of this port is 1/100 of the output port, and the monitoring port is a BNC connector, which can be directly connected to the oscilloscope for real-time monitoring of the output voltage.

ATA-2022H is an ideal dual-channel power amplifier that can amplify AC and DC signals. The maximum output is 200Vp-p (±100Vp) high voltage, which can drive high voltage loads. The voltage gain is digitally adjustable, and the commonly used settings are saved with one key. It provides convenient and simple operation options. It can be used with mainstream signal generators to achieve perfect signal amplification.

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Input

The input is a BNC interface, and the input resistance is 50Ω and 5kΩ optional, which perfectly matches the high and low internal resistance signal sources.

Output

The output is a banana socket, the maximum output voltage is 200Vp-p (±100Vp), and the output current (peak value) is 500mAp.

Aigtek is a manufacturer specializing in the production of electronic test instruments. Its main products include power amplifiers, high-voltage power amplifiers, wiring harness testers, and high-precision reference sources. The power amplifier solves the small current and low power problems of the arbitrary waveform function signal generator. The maximum output high voltage is 1600Vpp, the maximum current is 18A, and the maximum power is 810W. It will be used in power systems, underwater acoustic transducer drives, ultrasonic drives, and capacitive loads. , Inductive load, electromagnetic field drive, piezoelectric ceramic drive, etc.

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