Hall thruster discharge disturbance acquisition device and method

Abstract

The invention relates to a Hall thruster discharge disturbance acquisition device and a Hall thruster discharge disturbance acquisition method, which are used for solving the technical problems of relatively low accuracy and reliability of an acquisition result of a Hall thruster discharge disturbance acquisition device in the prior art. According to the Hall thruster discharge disturbance acquisition device provided by the invention, the oscilloscope is used for measuring voltage and current changes of anode and cathode ignition, when the changes exceed a preset value, an acquisition triggering signal is sent to the high-speed camera while electric signal acquisition is automatically triggered, and the high-speed camera synchronously acquires an optical signal; and dual acquisition of photoelectric signals is realized.

Description

Technical Field

[0001] The present invention relates to a thruster, and in particular to a device and method for collecting discharge disturbances of a Hall thruster. Background Art

[0002] The discharge disturbance generated by the Hall thruster will have a certain impact on its own performance, life and reliability. The discharge disturbance generated by the Hall thruster has different amplitudes and frequencies at different times, so it is instantaneous and unpredictable. It is necessary to use an acquisition device to conduct long-term acquisition of the discharge disturbance generated by the Hall thruster, and on the basis of a large amount of collected data, study the laws of the discharge disturbance and form an effective method to suppress the discharge disturbance.

[0003] Existing Hall thruster discharge disturbance acquisition devices generally have the limitation of detecting a single physical quantity. They only collect electrical signals such as current and voltage, and perform disturbance analysis based on the acquisition results, ignoring the synchronous acquisition and correlation analysis of plasma light radiation signals, resulting in low accuracy and reliability of the acquisition results. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problem of low accuracy and reliability of the collected results of the existing Hall thruster discharge disturbance collection device, and to provide a Hall thruster discharge disturbance collection device and method.

[0005] To achieve the above objectives, the technical solutions provided by the present invention are as follows:

[0006] A Hall thruster discharge disturbance acquisition device, which is special in that:

[0007] Including industrial computer, oscilloscope, high-speed camera and DC power supply pack;

[0008] The output terminal of the industrial computer is connected to the first input terminal of the oscilloscope for outputting a start signal;

[0009] The second input terminal of the oscilloscope is connected to the first output terminal of the Hall thruster to be collected, and is used to collect the electrical signal at a preset frequency after receiving a start signal and monitoring that the electrical signal generated during the discharge disturbance of the Hall thruster to be collected meets the collection conditions;

[0010] The output end of the oscilloscope is connected to the first input end of the high-speed camera, and is used to send a trigger acquisition signal to the high-speed camera at the preset frequency;

[0011] The second input end of the high-speed camera is connected to the second output end of the Hall thruster to be collected, and is used to collect the optical signal generated during the discharge disturbance of the Hall thruster to be collected after receiving the trigger collection signal;

[0012] The first output end of the DC power supply group is connected to the input end of the Hall thruster to be collected, and is used to provide a DC signal to the Hall thruster to be collected.

[0013] Furthermore, the electrical signals collected by the oscilloscope during the Hall thruster discharge disturbance process include anode discharge current value, anode voltage value, cathode ignition discharge current value and cathode ignition voltage value;

[0014] The acquisition conditions for the electrical signal generated during the discharge disturbance of the Hall thruster to be acquired are: the anode discharge current value is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100 μs.

[0015] Furthermore, the preset frequency is 1 MS / s.

[0016] Furthermore, when the oscilloscope detects that the electrical signal generated during the Hall thruster discharge disturbance is at the rated anode discharge current value, the acquisition of the electrical signal is stopped, and the sending of the trigger acquisition signal to the high-speed camera is also stopped, thereby stopping the acquisition of the optical signal; the rated anode discharge current value is 4.1A.

[0017] Furthermore, a filter switching device is provided between the DC power supply group and the Hall thruster to be collected. The first output end of the DC power supply group is connected to the input end of the filter switching device, and the output end of the filter switching device is connected to the input end of the Hall thruster to be collected. The filter switching device is used to ensure a stable supply of DC signals.

[0018] Furthermore, the second output terminal of the DC power supply group is connected to the input terminal of the industrial computer for transmitting the DC signal to the industrial computer, and the industrial computer monitors the received DC signal.

[0019] At the same time, the present invention also provides a method for collecting discharge disturbances of a Hall thruster, which adopts the above-mentioned device for collecting discharge disturbances of a Hall thruster. The method is special in that it includes the following steps:

[0020] Step 1: The industrial computer outputs a start signal to the oscilloscope;

[0021] Step 2: After receiving the start signal, the oscilloscope monitors the electrical signal generated during the discharge disturbance of the Hall thruster. When it is detected that the electrical signal meets the acquisition conditions, the electrical signal is acquired at a preset frequency, and a trigger acquisition signal is sent to the high-speed camera at the preset frequency.

[0022] Step 3: After receiving the trigger acquisition signal, the high-speed camera acquires the optical signal generated during the discharge disturbance of the Hall thruster to be acquired.

[0023] Furthermore, in step 2, the acquisition condition is that the anode discharge current value is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100 μs.

[0024] Furthermore, the preset frequency in step 2 is 1 MS / s.

[0025] Furthermore, after step 3, the following steps are also included:

[0026] In step 2, when the oscilloscope detects that the electrical signal generated during the Hall thruster discharge disturbance is at the rated anode discharge current value, the acquisition of the electrical signal is stopped, and the sending of the trigger acquisition signal to the high-speed camera is also stopped, thereby stopping the acquisition of the optical signal; the rated anode discharge current value is 4.1A.

[0027] Beneficial effects of the present invention:

[0028] 1. The present invention provides a device and method for collecting discharge disturbances of a Hall thruster. When an oscilloscope detects that the current value change of the anode of the electrical signal generated during the discharge disturbance meets the collection conditions, the device automatically triggers the collection of the electrical signal and sends a trigger collection signal to a high-speed camera. The high-speed camera synchronously collects the optical signal, realizing dual collection of the photoelectric signal and improving the accuracy and reliability of the collection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a structural schematic diagram of an embodiment of a Hall thruster discharge disturbance acquisition device of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and examples.

[0031] like Figure 1 As shown, the present invention provides a Hall thruster discharge disturbance acquisition device, which includes an industrial computer, an oscilloscope, a high-speed camera and a DC power supply group; the output end of the industrial computer is connected to the first input end of the oscilloscope for outputting a start signal.

[0032] The second input terminal of the oscilloscope is connected to the first output terminal of the Hall thruster to be collected. When the oscilloscope receives the start signal and monitors that the anode discharge current value of the electrical signal generated during the discharge disturbance of the Hall thruster to be collected is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100μs, the oscilloscope will record it at a sampling rate of 1MS / s and send a trigger acquisition signal to the high-speed camera at the same time. The oscilloscope will switch the configuration file every 5 minutes and record the above parameters at a sampling rate of 250ks / s. The oscilloscope uses the MS056B oscilloscope recorder to perform multi-channel measurements and achieve extremely high-frequency sampling.

[0033] A 30A current probe is used to measure the anode discharge current and cathode ignition current, with a 50A peak pulse current capability, a DC gain error of less than 1%, and a minimum current resolution of 1mA. A 1.5kV high-voltage differential probe is used to measure the anode voltage and cathode ignition voltage, with a bandwidth ≮200MHz, a gain of 50X / 500X, and a rise time of <2ns.

[0034] The output end of the oscilloscope is connected to the first input end of the high-speed camera, and is used to send a trigger acquisition signal to the high-speed camera at the same frequency of 1MS / s; the second input end of the high-speed camera is connected to the second output end of the Hall thruster to be collected, and is used to collect the optical signal generated during the discharge disturbance of the Hall thruster to be collected after receiving the trigger acquisition signal.

[0035] The high-speed camera is used to detect changes in plasma brightness during the discharge disturbance, detect possible spatter, and determine the timing correlation between spatter appearance and plasma current fluctuations during the discharge disturbance. Because the high-speed camera cannot record continuously, it records video after receiving the trigger acquisition signal from the oscilloscope. The recording length is before and after receiving the trigger acquisition signal.

[0036] The maximum acquisition frequency of the high-speed camera is not less than 100kfps. It is placed in the acquisition window during the discharge disturbance monitoring test. When the anode discharge current value is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100μs, the oscilloscope automatically triggers the acquisition and sends a trigger acquisition signal to the high-speed camera. After receiving the trigger acquisition signal sent by the oscilloscope, the image in the time window from t0-t to t0+t is stored in the computer with that moment as t0. The empirical value of t is 3s, which can be adjusted according to the equipment performance and acquisition requirements. The technical indicators are as follows: maximum resolution: 1280*1024; full-frame shooting speed: 13800fps; maximum shooting speed: 1000000fps; minimum exposure time: 100ns.

[0037] A first output terminal of the DC power supply group is connected to an input terminal of the Hall thruster to be collected, and is used to provide a DC signal to the Hall thruster to be collected. A filter switching device is provided between the DC power supply group and the Hall thruster to be collected. The first output terminal of the DC power supply group is connected to the input terminal of the filter switching device, and the output terminal of the filter switching device is connected to the input terminal of the Hall thruster to be collected. The filter switching device is used to ensure a stable supply of the DC signal.

[0038] When the oscilloscope detects that the electrical signal generated during the Hall thruster discharge disturbance returns to the rated anode discharge current value, the acquisition of the electrical signal is stopped, and the sending of the trigger acquisition signal to the high-speed camera is also stopped, thereby stopping the acquisition of the optical signal; the rated anode discharge current value is 4.1A.

[0039] This embodiment provides a method for collecting discharge disturbances of a Hall thruster, using the above-mentioned device for collecting discharge disturbances of a Hall thruster, and includes the following steps:

[0040] Step 1: The industrial computer outputs a start signal to the oscilloscope;

[0041] Step 2: After receiving the start signal, the oscilloscope monitors the electrical signal generated during the Hall thruster discharge disturbance. When the monitored electrical signal meets the acquisition conditions, the electrical signal is acquired at a frequency of 1MS / s. The acquisition conditions are that the anode discharge current value is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100μs.

[0042] Step 3: While the oscilloscope is collecting the electrical signal generated during the Hall thruster discharge disturbance at a frequency of 1 MS / s, a trigger collection signal is sent to the high-speed camera at the same preset frequency;

[0043] Step 4: After receiving the trigger acquisition signal, the high-speed camera collects the optical signal generated during the discharge disturbance of the Hall thruster to be collected;

[0044] In step 2, when the oscilloscope detects that the electrical signal generated during the Hall thruster discharge disturbance is the rated anode discharge current value, the acquisition of the electrical signal is stopped. At the same time, the trigger acquisition signal to the high-speed camera is also stopped, thereby stopping the acquisition of the optical signal. The rated anode discharge current value is 4.1A.

Claims

1. A Hall thruster discharge disturbance acquisition device, characterized by: Including industrial computer, oscilloscope, high-speed camera and DC power pack; The output terminal of the industrial computer is connected to the first input terminal of the oscilloscope for outputting a start signal; The second input terminal of the oscilloscope is connected to the first output terminal of the Hall thruster to be collected, and is used to collect the electrical signal at a preset frequency after receiving a start signal and monitoring that the electrical signal generated during the discharge disturbance of the Hall thruster to be collected meets the collection conditions; The output end of the oscilloscope is connected to the first input end of the high-speed camera, and is used to send a trigger acquisition signal to the high-speed camera at the preset frequency; The second input end of the high-speed camera is connected to the second output end of the Hall thruster to be collected, and is used to collect the optical signal generated during the discharge disturbance of the Hall thruster to be collected after receiving the trigger collection signal; The first output end of the DC power supply group is connected to the input end of the Hall thruster to be collected, and is used to provide a DC signal to the Hall thruster to be collected.

2. The Hall thruster discharge disturbance acquisition device according to claim 1, characterized in that: The electrical signals collected by the oscilloscope during the Hall thruster discharge disturbance process include anode discharge current value, anode voltage value, cathode ignition discharge current value and cathode ignition voltage value; The acquisition conditions for the electrical signal generated during the discharge disturbance of the Hall thruster to be acquired are: the anode discharge current value is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100 μs.

3. The Hall thruster discharge disturbance acquisition device according to claim 2, characterized in that: The preset frequency is 1 MS / s.

4. The Hall thruster discharge disturbance acquisition device according to claim 3, characterized in that: When the oscilloscope detects that the electrical signal generated during the Hall thruster discharge disturbance is the rated anode discharge current value, the acquisition of the electrical signal is stopped, and the trigger acquisition signal to the high-speed camera is also stopped, thereby stopping the acquisition of the optical signal; The rated anode discharge current value is 4.1A.

5. The Hall thruster discharge disturbance acquisition device according to claim 4, characterized in that: A filter switching device is provided between the DC power supply group and the Hall thruster to be collected. The first output end of the DC power supply group is connected to the input end of the filter switching device, and the output end of the filter switching device is connected to the input end of the Hall thruster to be collected. The filter switching device is used to ensure a stable supply of DC signals.

6. The Hall thruster discharge disturbance acquisition device according to claim 5, characterized in that: The second output terminal of the DC power supply group is connected to the input terminal of the industrial computer for transmitting the DC signal to the industrial computer, and the industrial computer monitors the received DC signal.

7. A method for collecting discharge disturbances of a Hall thruster, using a device for collecting discharge disturbances of a Hall thruster according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: The industrial computer outputs a start signal to the oscilloscope; Step 2: After receiving the start signal, the oscilloscope monitors the electrical signal generated during the discharge disturbance of the Hall thruster. When it is detected that the electrical signal meets the acquisition conditions, the electrical signal is acquired at a preset frequency, and a trigger acquisition signal is sent to the high-speed camera at the preset frequency. Step 3: After receiving the trigger acquisition signal, the high-speed camera acquires the optical signal generated during the discharge disturbance of the Hall thruster to be acquired.

8. The method for collecting discharge disturbances of a Hall thruster according to claim 7, characterized in that: In step 2, the acquisition conditions are that the anode discharge current value is greater than twice the rated anode discharge current value, and the duration of the transient high current is greater than 100 μs.

9. The method for collecting discharge disturbances of a Hall thruster according to claim 8, characterized in that: The preset frequency in step 2 is 1 MS / s.

10. The method for collecting discharge disturbances of a Hall thruster according to claim 9, characterized in that: In step 2, when the oscilloscope detects that the electrical signal generated during the Hall thruster discharge disturbance is the rated anode discharge current value, the acquisition of the electrical signal is stopped, and the trigger acquisition signal to the high-speed camera is also stopped, thereby stopping the acquisition of the optical signal. The rated anode discharge current value is 4.1A.

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