CN-121995172-A - On-line diagnosis device for working mode of surface dielectric barrier discharge exciter based on electroacoustic signal coupling characteristics

CN121995172ACN 121995172 ACN121995172 ACN 121995172ACN-121995172-A

Abstract

The invention discloses an on-line diagnosis device for a working mode of a surface dielectric barrier discharge exciter based on electroacoustic signal coupling characteristics, and belongs to the technical field of plasma technology and electric equipment state monitoring intersection. The method extracts the relevant characteristics of the voltage and current waveforms and the excitation acoustic signals in the time domain, the frequency domain and the energy coupling layer by synchronously collecting the voltage and current waveforms and the excitation acoustic signals in the discharging process, and realizes non-optical and real-time on-line discrimination of wire discharge, dispersion discharge and transition states of typical working modes of surface dielectric barrier discharge. The invention does not need high-speed imaging equipment, is suitable for monitoring the state of the exciter and regulating and controlling the closed loop in harsh environments such as flow control and the like, and has the advantages of simple structure, quick response, strong environmental adaptability and the like.

Inventors

ZHANG CHENG
ZHANG JINTAO
WANG HANG
HUANG BANGDOU
SHAO TAO

Assignees

中国科学院电工研究所

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (10)

1. An on-line diagnosis device for the working mode of a surface dielectric barrier discharge exciter based on electroacoustic signal coupling characteristics is characterized by comprising: a plasma exciter module for generating a discharge to be diagnosed; the electrical parameter diagnosis module is used for synchronously collecting voltage waveforms and current waveforms in the discharging process of the plasma exciter module; the acoustic emission parameter diagnosis module is used for collecting acoustic signals excited by the discharge; the synchronous and signal acquisition module is used for synchronously acquiring the voltage waveform, the current waveform and the acoustic signal; The signal processing module is used for carrying out time-frequency analysis on the synchronously acquired current waveform and the acoustic signal, extracting coupling characteristics between the current waveform and the acoustic signal, and carrying out real-time on-line judgment on the working mode of the plasma exciter module based on the coupling characteristics, wherein the synchronous time sequence reference and/or auxiliary characteristic extraction of discharge is provided by the voltage waveform.
2. The on-line diagnosis device for the operation mode of the surface dielectric barrier discharge exciter based on the coupling characteristic of the electroacoustic signal according to claim 1, wherein the acoustic emission parameter diagnosis module comprises a high-sensitivity broadband microphone with a frequency response of 20 Hz to 100 kHz and a sensitivity of not less than 50 mV/Pa, and the microphone is installed in a non-interference area of 5 mm to 50mm downstream of the plasma exciter.
3. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the coupling characteristic of the electroacoustic signal according to claim 1, wherein the acoustic emission parameter diagnosis module comprises a piezoelectric acoustic emission sensor, the center frequency of the sensor is 50 kHz to 200 kHz, and the sensor is attached to the medium surface undischarged area of the plasma exciter through a coupling agent.
4. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the electroacoustic signal coupling characteristic according to claim 1, further comprising an electromagnetic signal diagnosis module for acquiring the high-frequency electromagnetic radiation signal excited by the discharge and inputting the high-frequency electromagnetic radiation signal to the synchronization and signal acquisition module.
5. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the coupling characteristic of the electroacoustic signals according to claim 1, wherein the synchronous and signal acquisition module is a multichannel high-speed data acquisition device, the analog bandwidth is not lower than 100 MHz, the sampling rate is not lower than 250 MS/s, and the on-line diagnosis device supports external hardware triggering, and the rising edge of the discharge current waveform is used as a trigger source, so that the synchronous acquisition time alignment precision of voltage, current and acoustic signals is better than 10 ns.
6. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the coupling characteristics of the electroacoustic signals according to claim 1, wherein the signal processing module processes the synchronously acquired current signals and the acoustic signals through Hilbert yellow transformation to generate respective HHT spectrums, and extracts the time-frequency coupling characteristics for distinguishing the discharge modes by comparing the HHT spectrums of the current signals and the acoustic signals.
7. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the coupling characteristic of the electroacoustic signal according to claim 1, wherein the signal processing module is used for realizing the discharge mode distinction by comparing the time-frequency characteristics of the current signal and the acoustic signal, positioning the starting time point of the two surface ionization wave propagation events under single pulse excitation and extracting the energy characteristics of the two events.
8. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the electroacoustic signal coupling characteristics is characterized in that the working mode of the plasma exciter comprises wire discharge, dispersion discharge and transition states, and the signal processing module analyzes the extracted coupling characteristics and outputs a judging result of the working mode.
9. The on-line diagnostic device for the operation mode of a surface dielectric barrier discharge exciter based on the coupling characteristic of an electroacoustic signal according to claim 1, wherein the electrical parameter diagnostic module comprises a high voltage probe and a current probe, the high voltage probe is connected in parallel with the high voltage end of the plasma exciter, and the current probe is connected in series in the ground loop of the plasma exciter.
10. The on-line diagnosis device for the working mode of the surface dielectric barrier discharge exciter based on the electroacoustic signal coupling characteristic of claim 1, wherein the signal processing module performs single-cycle level real-time discrimination and dynamic tracking on the working mode of the plasma exciter by analyzing signals of single pulse discharge or continuous pulse train discharge.

Description

On-line diagnosis device for working mode of surface dielectric barrier discharge exciter based on electroacoustic signal coupling characteristics Technical Field The invention belongs to the technical field of plasma technology and electrical equipment state monitoring intersection, and particularly relates to an on-line diagnosis device for a working mode of a surface dielectric barrier discharge exciter based on electroacoustic signal coupling characteristics. Background The surface dielectric barrier discharge (surface dielectric barrier discharge, SDBD) exciter is a core execution device in low-temperature plasma flow control, and is widely applied to the fields of aircraft rise, boundary layer separation inhibition and the like. The control efficiency is directly dependent on the discharge working mode, and mainly comprises wire discharge with concentrated energy and dispersion discharge with uniform distribution. Therefore, accurate identification and real-time monitoring of the discharge mode are the precondition for realizing closed-loop plasma flow control. Currently, the mainstream diagnostic means of SDBD discharge mode rely on enhanced charge coupled devices (ICCDs) in combination with nanosecond gated imaging techniques. The method judges the mode by acquiring the space image of discharge luminescence, has higher space resolution, but has obvious limitations that ICCD equipment has high cost and huge volume, is difficult to be deployed in practical engineering sites such as wind tunnels, flight skins and the like due to strict light-shielding environment, generally depends on multi-period image accumulation for diagnosis, cannot capture microsecond mode transition in a single period in real time and has delayed response, and is only sensitive to a luminescence region, insensitive to key physical processes such as dark discharge, surface charge dynamics and the like and possibly leads to erroneous judgment. On the other hand, electro-acoustic joint diagnostic techniques have been applied in the detection of partial discharges in electrical equipment. However, the conventional method is directed to discharge with low repetition frequency and high single energy, the electro-acoustic signals of which have clear one-to-one correspondence, and the discharge types and acoustic signal characteristics are significantly different. While SDBD works under high-frequency excitation of kHz magnitude, single discharge energy is extremely low (micro-focus magnitude), sound signals are weak, sound waves are seriously aliased in time domain under high repetition frequency, and the traditional electric-acoustic correlation method based on time sequence alignment is difficult to directly apply. The existing analysis method which only depends on electrical parameters (such as current pulse characteristics) or independent acoustic frequency spectrums generally lacks of space resolution capability or insufficient signal to noise ratio, and is difficult to realize real-time discrimination of high confidence degree on filiform, diffuse and transition states of SDBD. Therefore, development of a technology which is non-optical, suitable for severe environments and capable of realizing single-cycle real-time online diagnosis of an SDBD discharge mode is needed to overcome the defects of strong environmental dependence, delayed response and insufficient discrimination reliability in the prior art. Disclosure of Invention In order to solve the technical problems, the invention provides an online diagnosis device for a surface dielectric barrier discharge exciter working mode based on electroacoustic signal coupling characteristics, which is characterized in that voltage-current waveforms and broadband acoustic response signals are synchronously acquired with high precision, multidimensional characteristic parameters such as time domain waveform matching degree, frequency domain energy coupling ratio, instantaneous phase relevance and the like are extracted, and a mapping relation between a discharge microstructure (such as number of filament channels, spatial distribution density and development continuity) and an electro-acoustic coupling fingerprint is established, so that single-cycle real-time discrimination and dynamic tracking of SDBD (standard digital data packet) filament, dispersion and transition state working modes are realized under the condition of no optical imaging, and the engineering applicability, environmental robustness and physical interpretability of the diagnosis device are remarkably improved. In order to achieve the above purpose, the invention adopts the following technical scheme: An on-line diagnosis device for a surface dielectric barrier discharge exciter working mode based on electroacoustic signal coupling characteristics, comprising: a plasma exciter module for generating a discharge to be diagnosed; the electrical parameter diagnosis module is used for synchronously collecting voltage wave