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Application of Power Amplifier in Ultrasonic Transducer Drive

发布:2021-03-17

With the deepening of the theoretical research of power ultrasonic and the increasingly perfecting of equipment manufacturing technology, ultrasonic technology is widely used in many fields such as food inspection, processing, chemical industry, medical treatment, biological engineering and so on. As an important part of the ultrasonic drive, the power amplifier, its power adjustment ability and the stability of the output amplitude directly affect the performance of the ultrasonic equipment.

The working principle of an ultrasonic transducer (ultrasonic probe) is that it usually contains an electric energy storage element and a mechanical vibration system inside. When the transducer is used as a transmitter, the electric oscillation signal sent from the excitation power supply will cause the electric field or magnetic field in the electric energy storage element of the transducer to change. This change will affect the mechanical vibration system of the transducer through a certain effect. A driving force is generated to enter the vibration state, thereby driving the medium in contact with the mechanical vibration system of the transducer to vibrate, and radiate sound waves into the medium. The process of receiving sound waves is just the opposite. External sound waves act on the vibrating surface of the transducer, thereby causing the mechanical vibration system of the transducer to vibrate. With the help of a certain physical effect, it causes the electric field or electric field in the energy storage element of the transducer. The magnetic field changes accordingly, causing the electrical output of the transducer to generate a voltage and current corresponding to the acoustic signal.

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Aigtek introduced an ultrasonic power amplifier, which amplifies the voltage signal input by the signal generator, and monitors the voltage on the oscilloscope by adjusting the amplification factor. ATA-2161 high-voltage high-power linear amplifier can amplify ±5V signals above ±800V, continuous power can reach 32W, output current ±40mA, can amplify AC and DC voltage signals at the same time, drive various loads, and supply power for the amplifier It is bipolar adjustable, especially suitable for driving capacitive loads such as piezoelectric ceramics.

ATA-2161 power amplifier has current energy, making it an ideal buffer for signal generators in electromagnetic or magnetic excitation applications. The input is BNC interface, and the input resistance is 50Ω and 5kΩ for two options, which perfectly matches the high and low internal resistance signal sources.

The output is a banana socket, the maximum output voltage is 1600Vp-p (±800V), and the output current (peak value) is 40mA.

The operation panel LCD display, the equipment status and parameter dynamic display, the interactive interface is clear at a glance, simple and easy to understand.

The voltage gain is adjustable from 0 to 240 times by digital 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.

Aigtek is a professional manufacturer 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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