Abstract: Disclosed is a method for improving sensitivity of vacuum testing of a vacuum switch, including the following steps: S100: smearing a water-soluble metal nanoparticle reagent evenly on a surface of a target material of a to-be-tested vacuum switch, performing standing and forming a metal nanoparticle coating on the surface of the target material; S200: bombarding, by using laser pulse, the surface of the target material where the metal nanoparticle coating is formed, so as to generate plasma on the surface of the target material; S300: obtaining a plasma image by collecting the plasma, and obtaining a plasma spectrum by performing spectroscopic analysis on the plasma image; and S400: obtaining a vacuum degree of the to-be-tested vacuum switch based on the plasma spectrum. The present disclosure can effectively improve a laser focusing degree and laser pulse stability and reduce noise interference, so as to lower testing limits and improve the sensitivity of online vacuum testing of the vacuum switch.

Abstract: Disclosed are an online vacuum degree detection system and method based on single-fiber laser-induced breakdown spectroscopy. In the system, a laser device generates laser that excites the laser through fiber induced breakdown spectroscopy; a fiber coupler couples and injects the laser; a single fiber is connected to the fiber coupler to transmit the laser; one end of an LIBS probe is connected to the single fiber, and the other end of the LIBS probe extends into a vacuum arc-extinguishing chamber; the laser is induced by the LIBS probe to generate plasma, and the plasma is subjected to self-emission imaging and enters the fiber coupler via the LIBS probe; a dichroscope is arranged on the fiber coupler to separate the laser from the plasma; a processor is connected to a camera and a spectrometer.

Abstract: A plasma-activated gas disinfection device includes a plasma generating unit, a disinfection chamber, an air pump and a fluid control module, where the plasma generating unit works in a first working mode during a first time period, and generates a first plasma active gas in the first working mode; the plasma generating unit works in a second working mode during a second time period, and generates a second plasma active gas in the second working mode; and the first time period is before the second time period, and alternatively, the first time period is after the second time period, such that a disinfection object in the disinfection chamber is disinfected. The plasma generating unit in the present disclosure is a simple device, and only one discharge module is used for generating different plasma active gases.

Abstract: The disclosure discloses an optical path system for detecting a vacuum degree of a vacuum switch and a method thereof. In the optical path system, a plasma excitation unit excites pulsed laser along an excitation optical path to bombard a shielding case of a vacuum switch to be detected, so as to generate laser plasma; an optical path focusing unit focuses the excitation optical path and a collection optical path to focus the pulsed laser on the shielding case of the vacuum switch to be detected; the optical path focusing unit includes a visible laser device for generating visible light and an adjustment device for adjusting the excitation optical path; an image collection unit collects a laser plasma image and a visible light spot focusing image; the image collection unit includes a gated detector for collecting the visible light spot image and the laser plasma image via the collection optical path.

Abstract: Disclosed are an online vacuum degree detection system and method based on single-fiber laser-induced breakdown spectroscopy. In the system, a laser device generates laser that excites the laser through fiber induced breakdown spectroscopy; a fiber coupler couples and injects the laser; a single fiber is connected to the fiber coupler to transmit the laser; one end of an LIBS probe is connected to the single fiber, and the other end of the LIBS probe extends into a vacuum arc-extinguishing chamber; the laser is induced by the LIBS probe to generate plasma, and the plasma is subjected to self-emission imaging and enters the fiber coupler via the LIBS probe; a dichroscope is arranged on the fiber coupler to separate the laser from the plasma; a processor is connected to a camera and a spectrometer.

Abstract: The disclosure discloses an optical path system for detecting a vacuum degree of a vacuum switch and a method thereof.

Abstract: The present disclosure discloses a discharge plasma disinfection device and method thereof. In the disinfection device, a gliding arc electrode pair generates the RNS-dominated reactive gas under the excitation of a gliding arc high-voltage power supply; and a dielectric barrier discharge electrode pair generates the ROS-dominated reactive gas under the excitation of a dielectric barrier discharge high-voltage power supply. These two reactive gases are introduced into a mixing chamber in a specific ratio and are subjected to an effective mixing reaction through an internal recycle system to obtain RNS/ROS mixed reactive gas in which reactive nitrogen species and reactive oxygen species coexist. The RNS/ROS mixed reactive gas may be directly configured to perform disinfection, and may also be configured to process an aqueous solution and then perform disinfection by the processed plasma-activated water.

Abstract: The present disclosure provides a method and apparatus for power equipment online monitoring, intended to solve technical difficulties in power equipment online monitoring. The technology of the present disclosure lies in focusing laser to a to-be-detected substance inside and/or at a surface of the power equipment, generating a plasma by laser induction at the to-be-tested substance, quantitatively analyzing constituents and content of the to-be-detected substance by measuring the spectrum of the plasma, so as to determine a series of phenomena such as aging during running process of power equipment, chemical reaction state, surface absorption, deposition of electrically discharging product, vacuum leakage, trace moisture measurement, solid solution, liquid solution, gas solution and the like, thereby achieving the objective of online monitoring the power equipment.

Abstract: The present invention discloses an identification and protection method of electric shock accidents, comprising the following steps: S100, building a multiport impedance network model of 3D human structure; S200, building a multiport distribution network model of human electric shock based on the impedance network model of the 3D human structure; S300, identifying the electric shock accident and taking actions for protection on the basis of the multiport distribution network model of human electric shock, and by use of wavelet and short-term energy methods. Based on the simulation results of the multiport distribution network model of human electric shock, the present invention could obtain the parametric features of zero sequence current from time/frequency domain, then identifies electric shock and start electric leakage protection by the combination of wavelet and short-term energy methods.