Application Cases

Experiment Name: Colloid Thruster Emission Experiment under Unsteady Electric Field

Test Equipment:
ATA-7030 high-voltage amplifier, signal generator, oscilloscope, etc.

Experimental Process:

Figure 1: Colloid Emission Experimental System under Unsteady Electric Field

The experiment utilized a combination of a signal generator and a high-voltage amplifier, as shown in Figure 1. The signal generator output a low-amplitude disturbance voltage, which was amplified by the high-voltage amplifier and applied to the emitter. The collector plate was positioned 10 cm behind the extraction electrode to collect the emitted droplets. The voltage across a 1 MΩ resistor connected to the collector plate was recorded using an oscilloscope to calculate the emission current. The built-in 1/1000 attenuated voltage output monitoring port of the high-voltage amplifier was connected to the oscilloscope to record the voltage waveform applied to the emitter.

Figure 2: Emission Current Variation under 1 Hz Square Wave Pulse

Pulse emission experiments were conducted using an emitter with an inner diameter of 30 μm to investigate the variation of emission current under different pulse parameters. To explore the relationship between pulse amplitude and emission current, the flow rate was fixed at 0.4 sccm (initial voltage approximately 1050 V), with a square wave pulse frequency of 1 Hz and a duty cycle of 50%. Under these conditions, pulse emission tests were performed with voltages ranging from 1200 V to 1800 V. The sampling duration was 10 s, and the sampling frequency was 1 kHz. The time-domain diagram of the emission current and the trend of current pulse amplitude are shown in Figure 2, while the calculated time-domain diagram of thrust and the trend of thrust pulse amplitude are shown in Figure 3.

Figure 3: Thrust Variation under 1 Hz Square Wave Pulse

Test Results:

From the emission current variation diagram, it can be observed that under the influence of a 1 Hz square wave pulse, the emission current responded well, exhibiting a pulsed emission pattern at 1 Hz. As the voltage increased from 1200 V to 1800 V, the amplitude of the emission current generally increased with the voltage amplitude.

Recommended High-Voltage Amplifier: ATA-7030

Figure: ATA-7030 High-Voltage Amplifier Specifications

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