Seatch

Your Keywords

Application Cases

Application

Application Cases

Application of Broadband Power Amplifiers in Ultrasonic Acoustics and Droplet Dynamic Behavior Research

Author:Aigtek Number:0 Date:2025-10-21

Experiment Name: Study on Droplet Dynamic Behavior under Ultrasonic Acoustic Field

Experimental Objective:
To investigate the relationship between excitation voltage and levitation capability using ultrasonic transducers.

Test Equipment:
Power amplifier, signal generator, oscilloscope, ultrasonic focused transducer array, industrial camera.

Experimental Process:
The measurement system was designed to generate an acoustic field using a transducer array. The transducers were driven by a signal generator and a broadband amplifier, with the voltage regulated using the ATA-1372A. An oscilloscope was used to monitor the voltage and current of the transducers to calculate power. The moving targets included polyethylene foam with a density of approximately 20 kg/m³ and various solid and liquid samples of different densities but identical volumes. To minimize errors caused by placement at different node positions, all samples were released at the same potential well location for levitation before conducting voltage modulation experiments.

First, the adjustable power supply was set to the device’s rated voltage of 10 V to form a stable potential well in the standing-wave acoustic tweezer setup for sample levitation. Then, a foam microsphere sample with a volume of 0.01 cm³ or a 0.01 ml liquid sample was introduced into a pre-selected potential well using tweezers or a micro-injector. Once stable levitation was achieved, the voltage of the adjustable power supply was gradually decreased, reducing the acoustic levitation force at the potential well until it could no longer balance the gravitational force on the levitating sample, causing it to fall. The voltage value displayed on the oscilloscope at this point was recorded. To minimize human errors from variations in liquid volume and voltage readings, at least five experiments were conducted for each sample to obtain the average minimum voltage. This average value was recorded as the minimum levitation voltage for the sample at a volume of 0.01 cm³. At this voltage, the acoustic levitation force in the acoustic field roughly balanced the gravitational force on the levitating sample. Finally, another sample was placed in the acoustic field, and the above experimental steps were repeated. The experimental block diagram is shown in Figure 1-1.

Block Diagram of Voltage-Levitation Capability Experiment

Figure 1-1: Block Diagram of Voltage-Levitation Capability Experiment

Experimental Results:
Figure 1-2 shows the minimum voltage required for samples of different densities: polystyrene foam (0.02 g/cm³), 75% ethanol (0.86 g/cm³) at 5.362 V, water (1 g/cm³) at 6.132 V, cooking oil (0.9 g/cm³) at 5.502 V, and honey (1.5 g/cm³) at 6.61 V. The error bars represent the standard deviation measured in five drop tests. It can also be observed that the minimum levitation voltage of this ultrasonic focused transducer phased-array acoustic tweezer device increases linearly with the density of the levitating samples, consistent with theoretical analysis. The corresponding levitation masses are 0.2 mg, 8.6 mg, 9 mg, 10 mg, and 14 mg, allowing estimation of the mass of items that can be levitated at different voltages. Errors stem from variations in liquid volume and human errors in voltage readings.

Curve of Levitation Capability vs. Excitation Voltage

Figure 1-2: Curve of Levitation Capability vs. Excitation Voltage

Recommended Power Amplifier: ATA-1372A

ATA-1372A Broadband Amplifier Specifications

Figure: ATA-1372A Broadband Amplifier Specifications

This document has been compiled by Aigtek. For more application cases and detailed product information, please stay tuned. Xi'an Aigtek Electronics has become a large-scale instrument and equipment supplier with an extensive product line in the industry. Demo units are available for free trial.

You may be interested in: