Application Cases

Experiment Name: Experimental Measurement under AC-DC Electric Fields

Research Direction:
AEPS detection overcomes the limitations of traditional single-cycle detection by relying on sequential acquisition of space charge signals over several continuous cycles and repetition of detection phases to break through the frequency limitations of pulse sources, achieving high phase resolution in space charge detection.

Test Equipment:
High-voltage amplifier, Function generator, High-frequency pulse source, Digital oscilloscope, PEA electrode system, etc.

Experimental Process:

Figure 1: Structural diagram of the space charge measurement system under periodic electric fields based on the AEPS principle

The AEPS theory overcomes the limitations imposed by pulse source frequency on space charge measurement under periodic electric fields, enabling high phase resolution in space charge measurement under such conditions. The structural diagram of the system built based on the AEPS principle, suitable for space charge measurement in dielectrics under periodic electric fields, is shown in Figure 1. The system mainly consists of a function generator, high-voltage amplifier, high-frequency pulse source, digital oscilloscope, and PEA electrode system.

The PEA electrode system is independently developed by the laboratory, and its structure is as shown in the figure. The upper and lower electrodes are made of aluminum, with a 1.2 mm thick semi-conductive layer between the upper electrode and the sample. The acoustic wave signals inside the test sample pass through the lower electrode and are converted into voltage signals by the piezoelectric sensor, amplified by an amplifier, and finally received by a digital oscilloscope with large data storage capacity. The trigger signal of the digital oscilloscope is synchronized with the pulse source to ensure that the PEA signals generated by each pulse are collected. The voltage signal applied to the upper electrode at each moment is simultaneously collected and recorded through a voltage divider for later data processing.

Experimental Results:

(1) Traditional single-cycle space charge detection, when applied to space charge detection under periodic electric fields, has the drawbacks of relatively low phase resolution and high requirements for hardware circuit phase synchronization. In contrast, the AEPS detection principle enables high-precision, high phase resolution space charge detection under periodic electric fields without the need for complex phase synchronization devices in the hardware.

(2) The composition of the dielectric space charge detection system under periodic electric fields based on the AEPS principle is introduced.

High-Voltage Amplifier Recommendation: ATA-7050

Figure: ATA-7050 High-Voltage Amplifier Specifications

The experimental materials in this article have been compiled and released by Xi'an Aigtek Electronics. For more experimental solutions, please continue to follow the Aigtek official website. Aigtek is a high-tech enterprise in China specializing in the research, development, production, and sales of measurement instruments. The company has consistently focused on the R&D and manufacturing of test instrument products such as high-voltage amplifiers, voltage amplifiers, power amplifier modules, and high-precision current sources.