Application Cases

Experiment Name: Application of Power Amplifier in Research on Flow Injection Analysis System Based on Magnetic Particle Separation and Detection

Experimental Equipment: ATA-4012 High-Voltage Power Amplifier, Oscilloscope, Signal Generator, Digital Multimeter, High-Precision Automatic AC Voltage Stabilizer, Drive Magnetic Core, etc.

Experimental Content: Conduct feasibility research on direct detection technology for superparamagnetic nanoparticles: Construct a magnetic detection device based on magnetic induction coils, study the influence of different measurement conditions and detection methods on the quantitative measurement of magnetic particles, and preliminarily achieve the detection of mg-level magnetic particles.

Experimental Procedure:
The signal generator outputs a voltage Vop-p (peak-to-peak voltage of the signal generator output) with a specific frequency f and waveform. The signal is amplified by a power amplifier and applied to one coil. Another coil (referred to as the detection coil) is used for mutual induction with this coil. An oscilloscope is used to directly measure the voltage difference across the detection coil.

Figure: Schematic Diagram of the Experimental System

Experimental Results:
In the figure, the points inside the red circle represent voltage values after attenuation due to excessively high input voltage to the oscilloscope. The points inside the blue circle are error points. The inflection points inside the pink circle have been verified through multiple experiments as phenomena existing in the experiment.

Figure: Relationship Between Induced Voltage and Driving Frequency for Different Coil Combinations

Experimental Conclusion: A magnetic sensor design plan based on a uniform magnetic field and dual detection coils was constructed. Using this magnetic detection experimental setup, the presence of mg-level magnetic particles can already be detected. This experimental plan verifies the feasibility of magnetic detection for superparamagnetic nanoparticles.

Figure: ATA-4012C High-Voltage Power Amplifier Specifications and Parameters