Application Cases

Experiment Name: Dual-Source Localization Experiment with Standard Sound Sources and Bent Lead Signals

Experiment Purpose: To construct a partial discharge ultrasonic detection system based on EFPI sensors. The fiber optic membrane can sense the ultrasonic signals from partial discharges and deform. The deformation is converted into a phase change of light through the F-P cavity beam interference, causing a corresponding change in the output light intensity. The optical signal is then converted into an electrical signal by a photodetector, amplified, and collected by an oscilloscope to obtain information about the ultrasonic signal to be measured.

Figure: Partial Discharge Fiber Optic Sensor Detection Experimental Platform

In the experiment, a combination of standard sound sources and bent lead methods was used for the detection and localization of dual partial discharge sources. The specific operation was as follows: One sound source used a signal generator to drive a piezoelectric ceramic sensor (PZT) through the ATA-2022B high-voltage amplifier to produce a periodic signal (T=2.5ms). The signal generator emitted a standard sine wave with an amplitude of 5V. The amplifier's gain was set to 35 according to the maximum tolerance of the PZT, and a regular sound source signal could be received on the oscilloscope. The other sound source used the ultrasonic signal generated by breaking a 0.7mm pencil lead in oil on a pre-fixed copper plate. The ultrasonic signal generated by breaking the pencil lead at one position is shown in Figure 2, and its spectrum is shown in Figure 3, with a center frequency of 50kHz.

Figure 2: Ultrasonic Signal of Bent Lead at One Position

Figure 3: Spectrum of Bent Lead Signal

In the experiment, the amplifier's gain was already adjusted to the maximum tolerance of the PZT, but its amplitude was still much smaller than that of the bent lead signal, resulting in poor experimental waveforms. According to the results of the four sets of dual-source localization experiments with standard sound sources and bent lead signals, the localization error was large, making it difficult to form a precise and effective localization. Moreover, it was not the ultrasonic signal accompanying the occurrence of partial discharge, so its persuasiveness was insufficient. However, the idea of this scheme is to construct a stable signal-emitting standard sound source. During this period, only the experimental device needs to be operated to form another sound source to complete the experiment, which is convenient and easy to implement.

Figure: Specification Parameters of the ATA-2022B High-Voltage Amplifier

• Bandwidth: (-3dB) DC~1MHz

• Voltage: 200Vp-p (±100Vp)

• Current: 500mAp

• Power: 50Wp

• Slew Rate: ≥445V/us

• Applications: Ultrasonic testing, non-destructive testing, driving piezoelectric ceramics, dielectrophoretic cell sorting, ultrasonic atomization, ultrasonic focusing

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