Control method for zero setting detection of micro discharge

Abstract

The invention discloses a control method for zero setting detection of micro discharge. The control method comprises the following steps: step 1, monitoring a zero setting level jump variable on a frequency spectrograph when a micro discharge zero setting level is abnormal; step 2, adjusting an amplitude control knob by adopting a coarse adjustment mode, and observing the change of a zero setting level jump variable on the frequency spectrograph; step 3, in the process of the step 2, observing whether a zero setting level jump variable firstly rapidly descends and then remains unchanged or ascends in real time, if so, adopting a fine adjustment mode and entering step 4, and otherwise, continuing the step 2; and step 4, judging whether a zero-setting level jump variable is less than or equal to-70dBm or not, if so, finishing adjustment of the zero-setting level, and if not, continuing adjustment in a fine adjustment mode. According to the method, the adjustment efficiency and the adjustment precision can be improved, and the technical problem that the adjustment efficiency and the adjustment precision are difficult to guarantee due to the fact that the amplitude or the phase is manually adjusted in an existing zero adjustment detection method is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of micro-discharge testing, relates to a level adjustment method, and specifically is a control method for zeroing detection of micro-discharge. Background Art

[0002] The microdischarge effect is a vacuum resonant discharge phenomenon that occurs between two metal surfaces or on a single dielectric surface. It is excited by the radio frequency electric field and usually occurs in a microwave system under vacuum conditions. Microdischarge is usually excited by the radio frequency electric field transmitted in the component, and the electrons that are accelerated and gain energy in the radio frequency electric field collide with the surface to produce secondary electrons. The conditions for occurrence vary depending on the type of microdischarge, and it will only occur when the power, frequency and the size of the gap in the internal structure of the device meet a certain relationship. The generation of the microdischarge effect is related to factors such as vacuum pressure, processing technology, surface material and state.

[0003] When micro-discharge occurs, it will cause the noise near the carrier frequency of microwave devices to increase, the signal quality to deteriorate, and in severe cases, it will even cause permanent damage to microwave devices. The occurrence of micro-discharge effect has always been a huge safety hazard for communication, navigation and remote sensing satellites. Therefore, in order to ensure the normal operation of satellites in orbit, micro-discharge effect detection experiments have become a crucial link in the satellite development process.

[0004] Currently, the most sensitive method for micro-discharge detection is the zeroing detection method. The analog zeroing detection method has been maturely used in engineering, but this method requires manual adjustment of the amplitude or phase to control the zeroing level. The efficiency and adjustment accuracy of manual adjustment of the amplitude or phase are difficult to master.

[0005] To address this problem, a control method for zeroing detection of micro-discharge is urgently needed. The rotation angle signal is converted into an electrical pulse signal by adjusting the knob using a photoelectric encoder. The electrical pulse signal is detected based on the principle of pulse code modulation to adjust the phase and amplitude. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a control method for zeroing detection of micro-discharge to solve the technical problem that manual adjustment of amplitude or phase in the existing zeroing detection method makes it difficult to ensure adjustment efficiency and adjustment accuracy.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A control method for zeroing detection of micro-discharge, specifically comprising the following steps:

[0009] Step 1, monitoring and recording the zeroing level jump value △ on the spectrum analyzer when the micro-discharge zeroing level is abnormal;

[0010] Step 2, use the coarse adjustment mode to adjust the amplitude control knob, and observe the change of the zero level jump amount △ on the spectrum analyzer. If the change of the zero level jump amount △ exceeds 30%, it means that the adjustment amplitude is effective, and continue to adjust the amplitude control knob; if the change of the zero level jump amount △ does not exceed 30%, use the coarse adjustment mode to adjust the phase control knob;

[0011] The coarse adjustment mode is that the amplitude control knob or the phase control knob rotates 1 / 2 turn per second;

[0012] The adjustment resolution of the amplitude control knob and the phase control knob is the number of pulses received per second;

[0013] In the coarse adjustment mode, the minimum resolution of the amplitude adjustment is 2 M-C ×(ΔA / 2 N ), the minimum resolution of phase adjustment is 2 M-C ×(ΔP / 2 N ), where △A represents the amplitude attenuation range; △P represents the adjustment range of the phase control knob;

[0014] Step 3, during the process of step 2, observe in real time whether the zeroing level jump amount △ first drops rapidly and then remains unchanged or rises, and the zeroing level jump amount △ drops rapidly means that it exceeds 40%. If so, adopt the fine adjustment mode and enter step 4, otherwise continue the coarse adjustment mode of step 2;

[0015] The fine adjustment mode is that the amplitude control knob or the phase control knob rotates 1 / 8 of a turn per second;

[0016] Step 4, determine whether the zeroing level jump value △≤-70dBm is satisfied, if so, complete the adjustment of the zeroing level, if not, continue to adjust in fine adjustment mode;

[0017] Furthermore, the adjustment resolution of the phase control knob does not exceed △P / 2 M When the adjustment resolution of the phase control knob is set to this value, the adjustment speed and phase precision can be well taken into account.

[0018] Furthermore, the adjustment resolution of the amplitude control knob does not exceed △A / 2 M When the adjustment resolution of the amplitude control knob is set to this value, the adjustment speed and phase precision can be well taken into account.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The present invention controls the amplitude control knob and the phase control knob by adopting a photoelectric encoder, converts the rotation angle signals of the amplitude control knob and the phase control knob into electrical pulse signals, controls the adjustment of the amplitude and the phase based on a pulse code modulation method, improves the adjustment efficiency and the adjustment accuracy, and solves the technical problem that the adjustment efficiency and the adjustment accuracy are difficult to ensure due to manual adjustment of the amplitude or the phase in the existing zero adjustment detection method. DETAILED DESCRIPTION

[0021] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0022] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0023] Example:

[0024] Zero adjustment accuracy of 0.03dBm by micro-discharge;

[0025] In order to meet the zero adjustment depth better than -70dBm in the micro-discharge test, if the amplitude and phase cannot be absolutely equal / opposite, the amplitude adjustable resolution must meet 0.1dBm and the phase adjustable resolution must meet 0.5°.

[0026] If the amplitude attenuation range is set to ΔA = 35dBm and the phase shifter adjustment range is ΔP = 360°, the minimum resolution of the adjustment amplitude is ΔA / 2 N , the minimum phase resolution is ΔP / 2 N .

[0027] Through 8 channels total 2 8 The speed of adjusting the knob determines whether it is coarse adjustment or fine adjustment. The speed of turning the knob determines the quantization paragraph code and the intra-segment code, which ultimately controls the resolution of the adjustment to achieve high-efficiency and high-precision adjustment.

[0028] In order to ensure the attenuation linearity, a set of voltage-controlled attenuators is controlled by only 1~4V (a set of attenuation corresponds to 35dBm), and the corresponding DAC output range is 1 / 5*2 12 ~4 / 5*2 12 , the corresponding percentage is 50% to 0%. The theoretical design attenuation resolution is 35dBm / [(4V-1V) / 5V×2 12 ]=0.0142dBm, which can meet the requirement of minimum adjustable resolution of 0.1dBm.

[0029] In this embodiment, the voltage-controlled phase shift circuit is controlled by a 12-bit DAC. A set of voltage-controlled phase shifters is controlled by 0-5V (the phase shift corresponds to 0° to 360°), and the corresponding DAC output range is 0 to 2 12 The theoretical phase shift resolution is 360° / (2 12 )=0.088°, which can meet the requirement of phase adjustable resolution of 0.5°.

[0030] Actual test results:

[0031] Test items Index requirements Test Results Amplitude adjustment resolution 0.1dBm 0.07dBm Phase adjustment resolution 0.5° 0.41°

Claims

1. A control method for zeroing detection of micro-discharge, characterized in that: The rotation of the amplitude control knob and the phase control knob is controlled based on the photoelectric encoder, which specifically includes the following steps: Step 1, monitoring and recording the zeroing level jump value △ on the spectrum analyzer when the micro-discharge zeroing level is abnormal; Step 2, use the coarse adjustment mode to adjust the amplitude control knob, and observe the change of the zero level jump amount △ on the spectrum analyzer. If the change of the zero level jump amount △ exceeds 30%, it means that the adjustment amplitude is effective, and continue to adjust the amplitude control knob; if the change of the zero level jump amount △ does not exceed 30%, use the coarse adjustment mode to adjust the phase control knob; The coarse adjustment mode is that the amplitude control knob or the phase control knob rotates 1 / 2 turn per second; The adjustment resolution of the amplitude control knob and the phase control knob is the number of pulses received per second; In the coarse adjustment mode, the minimum resolution of the amplitude adjustment is 2 M-C ×(ΔA / 2 N ), the minimum resolution of phase adjustment is 2 M-C ×(ΔP / 2 N ), where △A represents the amplitude attenuation range; △P represents the adjustment range of the phase control knob; Step 3, during the process of step 2, observe in real time whether the zeroing level jump amount △ first drops rapidly and then remains unchanged or rises, and the zeroing level jump amount △ drops rapidly means that it exceeds 40%. If so, adopt the fine adjustment mode and enter step 4, otherwise continue the coarse adjustment mode of step 2; The fine adjustment mode is that the amplitude control knob or the phase control knob rotates 1 / 8 of a turn per second; Step 4, judging whether the zeroing level jump amount △≤-70dBm is satisfied, if so, the zeroing level adjustment is completed, if not, the fine adjustment mode is adopted to continue the adjustment.

2. The control method for zeroing detection of micro-discharge according to claim 1, characterized in that: The adjustment resolution of the phase control knob does not exceed △P / 2 M .

3. The control method for zeroing detection of micro-discharge according to claim 1, characterized in that: The adjustment resolution of the amplitude control knob does not exceed △A / 2 M .